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2to3.rst.txt
14.3
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__builtin__.rst.txt
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__future__.rst.txt
4.84
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__main__.rst.txt
535
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_winreg.rst.txt
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abc.rst.txt
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aepack.rst.txt
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aetools.rst.txt
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aetypes.rst.txt
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aifc.rst.txt
6.92
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al.rst.txt
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allos.rst.txt
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anydbm.rst.txt
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archiving.rst.txt
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argparse.rst.txt
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array.rst.txt
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ast.rst.txt
10.23
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asynchat.rst.txt
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asyncore.rst.txt
12.63
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atexit.rst.txt
3.82
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audioop.rst.txt
10.15
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autogil.rst.txt
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base64.rst.txt
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basehttpserver.rst.txt
10.16
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bastion.rst.txt
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bdb.rst.txt
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binascii.rst.txt
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binhex.rst.txt
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bisect.rst.txt
5.29
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bsddb.rst.txt
7.4
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bz2.rst.txt
7.88
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calendar.rst.txt
11.02
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carbon.rst.txt
15.58
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cd.rst.txt
11.69
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cgi.rst.txt
22.32
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cgihttpserver.rst.txt
2.72
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cgitb.rst.txt
2.81
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chunk.rst.txt
4.84
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cmath.rst.txt
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cmd.rst.txt
8.36
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code.rst.txt
6.95
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codecs.rst.txt
65.4
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codeop.rst.txt
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collections.rst.txt
40.48
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colorpicker.rst.txt
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colorsys.rst.txt
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commands.rst.txt
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compileall.rst.txt
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compiler.rst.txt
36.59
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configparser.rst.txt
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constants.rst.txt
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contextlib.rst.txt
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cookie.rst.txt
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cookielib.rst.txt
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copy.rst.txt
3.27
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copy_reg.rst.txt
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crypt.rst.txt
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crypto.rst.txt
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csv.rst.txt
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ctypes.rst.txt
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curses.ascii.rst.txt
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curses.panel.rst.txt
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curses.rst.txt
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custominterp.rst.txt
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datatypes.rst.txt
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datetime.rst.txt
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dbhash.rst.txt
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dbm.rst.txt
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debug.rst.txt
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decimal.rst.txt
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development.rst.txt
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difflib.rst.txt
30
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dircache.rst.txt
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dis.rst.txt
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distribution.rst.txt
426
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distutils.rst.txt
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dl.rst.txt
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doctest.rst.txt
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docxmlrpcserver.rst.txt
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dumbdbm.rst.txt
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dummy_thread.rst.txt
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dummy_threading.rst.txt
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easydialogs.rst.txt
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email-examples.rst.txt
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email.charset.rst.txt
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email.encoders.rst.txt
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email.errors.rst.txt
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email.generator.rst.txt
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email.header.rst.txt
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email.iterators.rst.txt
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email.message.rst.txt
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email.mime.rst.txt
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email.parser.rst.txt
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email.rst.txt
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email.utils.rst.txt
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ensurepip.rst.txt
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errno.rst.txt
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exceptions.rst.txt
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fcntl.rst.txt
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filecmp.rst.txt
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fileformats.rst.txt
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fileinput.rst.txt
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filesys.rst.txt
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fl.rst.txt
17.23
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fm.rst.txt
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fnmatch.rst.txt
3.03
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formatter.rst.txt
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fpectl.rst.txt
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fpformat.rst.txt
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fractions.rst.txt
5.17
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framework.rst.txt
11.18
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frameworks.rst.txt
378
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ftplib.rst.txt
15.35
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functions.rst.txt
73.75
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functools.rst.txt
7.27
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future_builtins.rst.txt
1.96
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gc.rst.txt
8.8
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gdbm.rst.txt
4.77
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gensuitemodule.rst.txt
3.04
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getopt.rst.txt
6.51
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getpass.rst.txt
1.83
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gettext.rst.txt
28.36
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gl.rst.txt
5.87
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glob.rst.txt
2.36
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grp.rst.txt
2.2
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gzip.rst.txt
4.71
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hashlib.rst.txt
7.21
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heapq.rst.txt
12.88
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hmac.rst.txt
3
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hotshot.rst.txt
4.19
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htmllib.rst.txt
7.21
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htmlparser.rst.txt
11.37
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httplib.rst.txt
36.58
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i18n.rst.txt
409
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ic.rst.txt
4.89
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idle.rst.txt
21.66
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imageop.rst.txt
3.91
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imaplib.rst.txt
16.82
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imgfile.rst.txt
2.7
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imghdr.rst.txt
2.57
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imp.rst.txt
12.3
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importlib.rst.txt
1.1
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imputil.rst.txt
6.86
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index.rst.txt
2.23
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inspect.rst.txt
27.49
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internet.rst.txt
950
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intro.rst.txt
2.74
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io.rst.txt
38.11
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ipc.rst.txt
630
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itertools.rst.txt
35.67
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jpeg.rst.txt
3.77
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json.rst.txt
24.95
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keyword.rst.txt
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language.rst.txt
523
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linecache.rst.txt
1.84
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locale.rst.txt
24.39
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logging.config.rst.txt
30.82
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logging.handlers.rst.txt
27.49
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logging.rst.txt
45.78
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mac.rst.txt
791
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macos.rst.txt
3.73
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macosa.rst.txt
3.87
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macostools.rst.txt
3.92
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macpath.rst.txt
650
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mailbox.rst.txt
66.53
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mailcap.rst.txt
3.59
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markup.rst.txt
1.22
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marshal.rst.txt
5.56
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math.rst.txt
10.66
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md5.rst.txt
2.75
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mhlib.rst.txt
3.87
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mimetools.rst.txt
4.4
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mimetypes.rst.txt
9.61
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mimewriter.rst.txt
3.28
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mimify.rst.txt
3.44
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miniaeframe.rst.txt
2.5
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misc.rst.txt
248
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mm.rst.txt
447
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mmap.rst.txt
10.24
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modulefinder.rst.txt
3.3
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modules.rst.txt
382
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msilib.rst.txt
18.62
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msvcrt.rst.txt
4.24
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multifile.rst.txt
6.46
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multiprocessing.rst.txt
90.45
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mutex.rst.txt
1.89
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netdata.rst.txt
432
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netrc.rst.txt
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new.rst.txt
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nis.rst.txt
2.06
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nntplib.rst.txt
14.19
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numbers.rst.txt
7.82
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numeric.rst.txt
751
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operator.rst.txt
21.57
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optparse.rst.txt
75.29
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os.path.rst.txt
12.79
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os.rst.txt
80.64
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ossaudiodev.rst.txt
16.9
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othergui.rst.txt
2.66
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parser.rst.txt
15.02
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pdb.rst.txt
15.67
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persistence.rst.txt
826
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pickle.rst.txt
36.39
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pickletools.rst.txt
1.95
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pipes.rst.txt
3.7
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pkgutil.rst.txt
7.53
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platform.rst.txt
9.33
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plistlib.rst.txt
4.04
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popen2.rst.txt
6.86
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poplib.rst.txt
6.07
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posix.rst.txt
3.54
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posixfile.rst.txt
7.03
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pprint.rst.txt
8.86
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profile.rst.txt
27.99
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pty.rst.txt
1.72
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pwd.rst.txt
2.66
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py_compile.rst.txt
2.42
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pyclbr.rst.txt
3.22
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pydoc.rst.txt
3.99
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pyexpat.rst.txt
28.21
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python.rst.txt
514
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queue.rst.txt
6.87
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quopri.rst.txt
2.61
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random.rst.txt
13.01
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re.rst.txt
53.81
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readline.rst.txt
10.27
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repr.rst.txt
4.61
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resource.rst.txt
9.37
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restricted.rst.txt
3.25
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rexec.rst.txt
11.47
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rfc822.rst.txt
13.71
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rlcompleter.rst.txt
2.44
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robotparser.rst.txt
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runpy.rst.txt
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sched.rst.txt
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scrolledtext.rst.txt
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select.rst.txt
20.26
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sets.rst.txt
14.62
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sgi.rst.txt
322
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sgmllib.rst.txt
10.41
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sha.rst.txt
2.74
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shelve.rst.txt
8.12
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shlex.rst.txt
11.05
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shutil.rst.txt
13.17
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signal.rst.txt
10.47
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simplehttpserver.rst.txt
4.45
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simplexmlrpcserver.rst.txt
10.63
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site.rst.txt
7.7
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smtpd.rst.txt
2.41
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smtplib.rst.txt
14.56
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sndhdr.rst.txt
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socket.rst.txt
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socketserver.rst.txt
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someos.rst.txt
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spwd.rst.txt
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sqlite3.rst.txt
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ssl.rst.txt
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stat.rst.txt
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statvfs.rst.txt
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stdtypes.rst.txt
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string.rst.txt
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stringio.rst.txt
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stringprep.rst.txt
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strings.rst.txt
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struct.rst.txt
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subprocess.rst.txt
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sun.rst.txt
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sunau.rst.txt
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sunaudio.rst.txt
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symbol.rst.txt
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symtable.rst.txt
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sys.rst.txt
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sysconfig.rst.txt
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syslog.rst.txt
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tabnanny.rst.txt
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tarfile.rst.txt
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telnetlib.rst.txt
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tempfile.rst.txt
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termios.rst.txt
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test.rst.txt
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textwrap.rst.txt
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thread.rst.txt
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threading.rst.txt
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time.rst.txt
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timeit.rst.txt
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tix.rst.txt
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tk.rst.txt
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tkinter.rst.txt
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token.rst.txt
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tokenize.rst.txt
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trace.rst.txt
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traceback.rst.txt
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ttk.rst.txt
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tty.rst.txt
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turtle.rst.txt
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types.rst.txt
6.05
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undoc.rst.txt
6.4
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unicodedata.rst.txt
5.59
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unittest.rst.txt
81.01
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unix.rst.txt
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urllib.rst.txt
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urllib2.rst.txt
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urlparse.rst.txt
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user.rst.txt
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userdict.rst.txt
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uu.rst.txt
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uuid.rst.txt
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warnings.rst.txt
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wave.rst.txt
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weakref.rst.txt
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webbrowser.rst.txt
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whichdb.rst.txt
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windows.rst.txt
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winsound.rst.txt
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wsgiref.rst.txt
29.85
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xdrlib.rst.txt
7.89
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xml.dom.minidom.rst.txt
10.95
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xml.dom.pulldom.rst.txt
1.53
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xml.dom.rst.txt
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xml.etree.elementtree.rst.txt
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Code Editor : xml.etree.elementtree.rst.txt
:mod:`xml.etree.ElementTree` --- The ElementTree XML API ======================================================== .. module:: xml.etree.ElementTree :synopsis: Implementation of the ElementTree API. .. moduleauthor:: Fredrik Lundh <fredrik@pythonware.com> .. versionadded:: 2.5 **Source code:** :source:`Lib/xml/etree/ElementTree.py` -------------- The :class:`Element` type is a flexible container object, designed to store hierarchical data structures in memory. The type can be described as a cross between a list and a dictionary. .. warning:: The :mod:`xml.etree.ElementTree` module is not secure against maliciously constructed data. If you need to parse untrusted or unauthenticated data see :ref:`xml-vulnerabilities`. Each element has a number of properties associated with it: * a tag which is a string identifying what kind of data this element represents (the element type, in other words). * a number of attributes, stored in a Python dictionary. * a text string. * an optional tail string. * a number of child elements, stored in a Python sequence To create an element instance, use the :class:`Element` constructor or the :func:`SubElement` factory function. The :class:`ElementTree` class can be used to wrap an element structure, and convert it from and to XML. A C implementation of this API is available as :mod:`xml.etree.cElementTree`. See http://effbot.org/zone/element-index.htm for tutorials and links to other docs. Fredrik Lundh's page is also the location of the development version of the xml.etree.ElementTree. .. versionchanged:: 2.7 The ElementTree API is updated to 1.3. For more information, see `Introducing ElementTree 1.3 <http://effbot.org/zone/elementtree-13-intro.htm>`_. Tutorial -------- This is a short tutorial for using :mod:`xml.etree.ElementTree` (``ET`` in short). The goal is to demonstrate some of the building blocks and basic concepts of the module. XML tree and elements ^^^^^^^^^^^^^^^^^^^^^ XML is an inherently hierarchical data format, and the most natural way to represent it is with a tree. ``ET`` has two classes for this purpose - :class:`ElementTree` represents the whole XML document as a tree, and :class:`Element` represents a single node in this tree. Interactions with the whole document (reading and writing to/from files) are usually done on the :class:`ElementTree` level. Interactions with a single XML element and its sub-elements are done on the :class:`Element` level. .. _elementtree-parsing-xml: Parsing XML ^^^^^^^^^^^ We'll be using the following XML document as the sample data for this section: .. code-block:: xml <?xml version="1.0"?> <data> <country name="Liechtenstein"> <rank>1</rank> <year>2008</year> <gdppc>141100</gdppc> <neighbor name="Austria" direction="E"/> <neighbor name="Switzerland" direction="W"/> </country> <country name="Singapore"> <rank>4</rank> <year>2011</year> <gdppc>59900</gdppc> <neighbor name="Malaysia" direction="N"/> </country> <country name="Panama"> <rank>68</rank> <year>2011</year> <gdppc>13600</gdppc> <neighbor name="Costa Rica" direction="W"/> <neighbor name="Colombia" direction="E"/> </country> </data> We have a number of ways to import the data. Reading the file from disk:: import xml.etree.ElementTree as ET tree = ET.parse('country_data.xml') root = tree.getroot() Reading the data from a string:: root = ET.fromstring(country_data_as_string) :func:`fromstring` parses XML from a string directly into an :class:`Element`, which is the root element of the parsed tree. Other parsing functions may create an :class:`ElementTree`. Check the documentation to be sure. As an :class:`Element`, ``root`` has a tag and a dictionary of attributes:: >>> root.tag 'data' >>> root.attrib {} It also has children nodes over which we can iterate:: >>> for child in root: ... print child.tag, child.attrib ... country {'name': 'Liechtenstein'} country {'name': 'Singapore'} country {'name': 'Panama'} Children are nested, and we can access specific child nodes by index:: >>> root[0][1].text '2008' Finding interesting elements ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ :class:`Element` has some useful methods that help iterate recursively over all the sub-tree below it (its children, their children, and so on). For example, :meth:`Element.iter`:: >>> for neighbor in root.iter('neighbor'): ... print neighbor.attrib ... {'name': 'Austria', 'direction': 'E'} {'name': 'Switzerland', 'direction': 'W'} {'name': 'Malaysia', 'direction': 'N'} {'name': 'Costa Rica', 'direction': 'W'} {'name': 'Colombia', 'direction': 'E'} :meth:`Element.findall` finds only elements with a tag which are direct children of the current element. :meth:`Element.find` finds the *first* child with a particular tag, and :attr:`Element.text` accesses the element's text content. :meth:`Element.get` accesses the element's attributes:: >>> for country in root.findall('country'): ... rank = country.find('rank').text ... name = country.get('name') ... print name, rank ... Liechtenstein 1 Singapore 4 Panama 68 More sophisticated specification of which elements to look for is possible by using :ref:`XPath <elementtree-xpath>`. Modifying an XML File ^^^^^^^^^^^^^^^^^^^^^ :class:`ElementTree` provides a simple way to build XML documents and write them to files. The :meth:`ElementTree.write` method serves this purpose. Once created, an :class:`Element` object may be manipulated by directly changing its fields (such as :attr:`Element.text`), adding and modifying attributes (:meth:`Element.set` method), as well as adding new children (for example with :meth:`Element.append`). Let's say we want to add one to each country's rank, and add an ``updated`` attribute to the rank element:: >>> for rank in root.iter('rank'): ... new_rank = int(rank.text) + 1 ... rank.text = str(new_rank) ... rank.set('updated', 'yes') ... >>> tree.write('output.xml') Our XML now looks like this: .. code-block:: xml <?xml version="1.0"?> <data> <country name="Liechtenstein"> <rank updated="yes">2</rank> <year>2008</year> <gdppc>141100</gdppc> <neighbor name="Austria" direction="E"/> <neighbor name="Switzerland" direction="W"/> </country> <country name="Singapore"> <rank updated="yes">5</rank> <year>2011</year> <gdppc>59900</gdppc> <neighbor name="Malaysia" direction="N"/> </country> <country name="Panama"> <rank updated="yes">69</rank> <year>2011</year> <gdppc>13600</gdppc> <neighbor name="Costa Rica" direction="W"/> <neighbor name="Colombia" direction="E"/> </country> </data> We can remove elements using :meth:`Element.remove`. Let's say we want to remove all countries with a rank higher than 50:: >>> for country in root.findall('country'): ... rank = int(country.find('rank').text) ... if rank > 50: ... root.remove(country) ... >>> tree.write('output.xml') Our XML now looks like this: .. code-block:: xml <?xml version="1.0"?> <data> <country name="Liechtenstein"> <rank updated="yes">2</rank> <year>2008</year> <gdppc>141100</gdppc> <neighbor name="Austria" direction="E"/> <neighbor name="Switzerland" direction="W"/> </country> <country name="Singapore"> <rank updated="yes">5</rank> <year>2011</year> <gdppc>59900</gdppc> <neighbor name="Malaysia" direction="N"/> </country> </data> Building XML documents ^^^^^^^^^^^^^^^^^^^^^^ The :func:`SubElement` function also provides a convenient way to create new sub-elements for a given element:: >>> a = ET.Element('a') >>> b = ET.SubElement(a, 'b') >>> c = ET.SubElement(a, 'c') >>> d = ET.SubElement(c, 'd') >>> ET.dump(a) <a><b /><c><d /></c></a> Parsing XML with Namespaces ^^^^^^^^^^^^^^^^^^^^^^^^^^^ If the XML input has `namespaces <https://en.wikipedia.org/wiki/XML_namespace>`__, tags and attributes with prefixes in the form ``prefix:sometag`` get expanded to ``{uri}sometag`` where the *prefix* is replaced by the full *URI*. Also, if there is a `default namespace <https://www.w3.org/TR/xml-names/#defaulting>`__, that full URI gets prepended to all of the non-prefixed tags. Here is an XML example that incorporates two namespaces, one with the prefix "fictional" and the other serving as the default namespace: .. code-block:: xml <?xml version="1.0"?> <actors xmlns:fictional="http://characters.example.com" xmlns="http://people.example.com"> <actor> <name>John Cleese</name> <fictional:character>Lancelot</fictional:character> <fictional:character>Archie Leach</fictional:character> </actor> <actor> <name>Eric Idle</name> <fictional:character>Sir Robin</fictional:character> <fictional:character>Gunther</fictional:character> <fictional:character>Commander Clement</fictional:character> </actor> </actors> One way to search and explore this XML example is to manually add the URI to every tag or attribute in the xpath of a :meth:`~Element.find` or :meth:`~Element.findall`:: root = fromstring(xml_text) for actor in root.findall('{http://people.example.com}actor'): name = actor.find('{http://people.example.com}name') print name.text for char in actor.findall('{http://characters.example.com}character'): print ' |-->', char.text A better way to search the namespaced XML example is to create a dictionary with your own prefixes and use those in the search functions:: ns = {'real_person': 'http://people.example.com', 'role': 'http://characters.example.com'} for actor in root.findall('real_person:actor', ns): name = actor.find('real_person:name', ns) print name.text for char in actor.findall('role:character', ns): print ' |-->', char.text These two approaches both output:: John Cleese |--> Lancelot |--> Archie Leach Eric Idle |--> Sir Robin |--> Gunther |--> Commander Clement Additional resources ^^^^^^^^^^^^^^^^^^^^ See http://effbot.org/zone/element-index.htm for tutorials and links to other docs. .. _elementtree-xpath: XPath support ------------- This module provides limited support for `XPath expressions <https://www.w3.org/TR/xpath>`_ for locating elements in a tree. The goal is to support a small subset of the abbreviated syntax; a full XPath engine is outside the scope of the module. Example ^^^^^^^ Here's an example that demonstrates some of the XPath capabilities of the module. We'll be using the ``countrydata`` XML document from the :ref:`Parsing XML <elementtree-parsing-xml>` section:: import xml.etree.ElementTree as ET root = ET.fromstring(countrydata) # Top-level elements root.findall(".") # All 'neighbor' grand-children of 'country' children of the top-level # elements root.findall("./country/neighbor") # Nodes with name='Singapore' that have a 'year' child root.findall(".//year/..[@name='Singapore']") # 'year' nodes that are children of nodes with name='Singapore' root.findall(".//*[@name='Singapore']/year") # All 'neighbor' nodes that are the second child of their parent root.findall(".//neighbor[2]") Supported XPath syntax ^^^^^^^^^^^^^^^^^^^^^^ .. tabularcolumns:: |l|L| +-----------------------+------------------------------------------------------+ | Syntax | Meaning | +=======================+======================================================+ | ``tag`` | Selects all child elements with the given tag. | | | For example, ``spam`` selects all child elements | | | named ``spam``, and ``spam/egg`` selects all | | | grandchildren named ``egg`` in all children named | | | ``spam``. | +-----------------------+------------------------------------------------------+ | ``*`` | Selects all child elements. For example, ``*/egg`` | | | selects all grandchildren named ``egg``. | +-----------------------+------------------------------------------------------+ | ``.`` | Selects the current node. This is mostly useful | | | at the beginning of the path, to indicate that it's | | | a relative path. | +-----------------------+------------------------------------------------------+ | ``//`` | Selects all subelements, on all levels beneath the | | | current element. For example, ``.//egg`` selects | | | all ``egg`` elements in the entire tree. | +-----------------------+------------------------------------------------------+ | ``..`` | Selects the parent element. | +-----------------------+------------------------------------------------------+ | ``[@attrib]`` | Selects all elements that have the given attribute. | +-----------------------+------------------------------------------------------+ | ``[@attrib='value']`` | Selects all elements for which the given attribute | | | has the given value. The value cannot contain | | | quotes. | +-----------------------+------------------------------------------------------+ | ``[tag]`` | Selects all elements that have a child named | | | ``tag``. Only immediate children are supported. | +-----------------------+------------------------------------------------------+ | ``[tag='text']`` | Selects all elements that have a child named | | | ``tag`` whose complete text content, including | | | descendants, equals the given ``text``. | +-----------------------+------------------------------------------------------+ | ``[position]`` | Selects all elements that are located at the given | | | position. The position can be either an integer | | | (1 is the first position), the expression ``last()`` | | | (for the last position), or a position relative to | | | the last position (e.g. ``last()-1``). | +-----------------------+------------------------------------------------------+ Predicates (expressions within square brackets) must be preceded by a tag name, an asterisk, or another predicate. ``position`` predicates must be preceded by a tag name. Reference --------- .. _elementtree-functions: Functions ^^^^^^^^^ .. function:: Comment(text=None) Comment element factory. This factory function creates a special element that will be serialized as an XML comment by the standard serializer. The comment string can be either a bytestring or a Unicode string. *text* is a string containing the comment string. Returns an element instance representing a comment. .. function:: dump(elem) Writes an element tree or element structure to sys.stdout. This function should be used for debugging only. The exact output format is implementation dependent. In this version, it's written as an ordinary XML file. *elem* is an element tree or an individual element. .. function:: fromstring(text) Parses an XML section from a string constant. Same as :func:`XML`. *text* is a string containing XML data. Returns an :class:`Element` instance. .. function:: fromstringlist(sequence, parser=None) Parses an XML document from a sequence of string fragments. *sequence* is a list or other sequence containing XML data fragments. *parser* is an optional parser instance. If not given, the standard :class:`XMLParser` parser is used. Returns an :class:`Element` instance. .. versionadded:: 2.7 .. function:: iselement(element) Checks if an object appears to be a valid element object. *element* is an element instance. Returns a true value if this is an element object. .. function:: iterparse(source, events=None, parser=None) Parses an XML section into an element tree incrementally, and reports what's going on to the user. *source* is a filename or file object containing XML data. *events* is a list of events to report back. If omitted, only "end" events are reported. *parser* is an optional parser instance. If not given, the standard :class:`XMLParser` parser is used. *parser* is not supported by ``cElementTree``. Returns an :term:`iterator` providing ``(event, elem)`` pairs. .. note:: :func:`iterparse` only guarantees that it has seen the ">" character of a starting tag when it emits a "start" event, so the attributes are defined, but the contents of the text and tail attributes are undefined at that point. The same applies to the element children; they may or may not be present. If you need a fully populated element, look for "end" events instead. .. function:: parse(source, parser=None) Parses an XML section into an element tree. *source* is a filename or file object containing XML data. *parser* is an optional parser instance. If not given, the standard :class:`XMLParser` parser is used. Returns an :class:`ElementTree` instance. .. function:: ProcessingInstruction(target, text=None) PI element factory. This factory function creates a special element that will be serialized as an XML processing instruction. *target* is a string containing the PI target. *text* is a string containing the PI contents, if given. Returns an element instance, representing a processing instruction. .. function:: register_namespace(prefix, uri) Registers a namespace prefix. The registry is global, and any existing mapping for either the given prefix or the namespace URI will be removed. *prefix* is a namespace prefix. *uri* is a namespace uri. Tags and attributes in this namespace will be serialized with the given prefix, if at all possible. .. versionadded:: 2.7 .. function:: SubElement(parent, tag, attrib={}, **extra) Subelement factory. This function creates an element instance, and appends it to an existing element. The element name, attribute names, and attribute values can be either bytestrings or Unicode strings. *parent* is the parent element. *tag* is the subelement name. *attrib* is an optional dictionary, containing element attributes. *extra* contains additional attributes, given as keyword arguments. Returns an element instance. .. function:: tostring(element, encoding="us-ascii", method="xml") Generates a string representation of an XML element, including all subelements. *element* is an :class:`Element` instance. *encoding* [1]_ is the output encoding (default is US-ASCII). *method* is either ``"xml"``, ``"html"`` or ``"text"`` (default is ``"xml"``). Returns an encoded string containing the XML data. .. function:: tostringlist(element, encoding="us-ascii", method="xml") Generates a string representation of an XML element, including all subelements. *element* is an :class:`Element` instance. *encoding* [1]_ is the output encoding (default is US-ASCII). *method* is either ``"xml"``, ``"html"`` or ``"text"`` (default is ``"xml"``). Returns a list of encoded strings containing the XML data. It does not guarantee any specific sequence, except that ``"".join(tostringlist(element)) == tostring(element)``. .. versionadded:: 2.7 .. function:: XML(text, parser=None) Parses an XML section from a string constant. This function can be used to embed "XML literals" in Python code. *text* is a string containing XML data. *parser* is an optional parser instance. If not given, the standard :class:`XMLParser` parser is used. Returns an :class:`Element` instance. .. function:: XMLID(text, parser=None) Parses an XML section from a string constant, and also returns a dictionary which maps from element id:s to elements. *text* is a string containing XML data. *parser* is an optional parser instance. If not given, the standard :class:`XMLParser` parser is used. Returns a tuple containing an :class:`Element` instance and a dictionary. .. _elementtree-element-objects: Element Objects ^^^^^^^^^^^^^^^ .. class:: Element(tag, attrib={}, **extra) Element class. This class defines the Element interface, and provides a reference implementation of this interface. The element name, attribute names, and attribute values can be either bytestrings or Unicode strings. *tag* is the element name. *attrib* is an optional dictionary, containing element attributes. *extra* contains additional attributes, given as keyword arguments. .. attribute:: tag A string identifying what kind of data this element represents (the element type, in other words). .. attribute:: text tail These attributes can be used to hold additional data associated with the element. Their values are usually strings but may be any application-specific object. If the element is created from an XML file, the *text* attribute holds either the text between the element's start tag and its first child or end tag, or ``None``, and the *tail* attribute holds either the text between the element's end tag and the next tag, or ``None``. For the XML data .. code-block:: xml <a><b>1<c>2<d/>3</c></b>4</a> the *a* element has ``None`` for both *text* and *tail* attributes, the *b* element has *text* ``"1"`` and *tail* ``"4"``, the *c* element has *text* ``"2"`` and *tail* ``None``, and the *d* element has *text* ``None`` and *tail* ``"3"``. To collect the inner text of an element, see :meth:`itertext`, for example ``"".join(element.itertext())``. Applications may store arbitrary objects in these attributes. .. attribute:: attrib A dictionary containing the element's attributes. Note that while the *attrib* value is always a real mutable Python dictionary, an ElementTree implementation may choose to use another internal representation, and create the dictionary only if someone asks for it. To take advantage of such implementations, use the dictionary methods below whenever possible. The following dictionary-like methods work on the element attributes. .. method:: clear() Resets an element. This function removes all subelements, clears all attributes, and sets the text and tail attributes to ``None``. .. method:: get(key, default=None) Gets the element attribute named *key*. Returns the attribute value, or *default* if the attribute was not found. .. method:: items() Returns the element attributes as a sequence of (name, value) pairs. The attributes are returned in an arbitrary order. .. method:: keys() Returns the elements attribute names as a list. The names are returned in an arbitrary order. .. method:: set(key, value) Set the attribute *key* on the element to *value*. The following methods work on the element's children (subelements). .. method:: append(subelement) Adds the element *subelement* to the end of this elements internal list of subelements. .. method:: extend(subelements) Appends *subelements* from a sequence object with zero or more elements. Raises :exc:`AssertionError` if a subelement is not a valid object. .. versionadded:: 2.7 .. method:: find(match) Finds the first subelement matching *match*. *match* may be a tag name or path. Returns an element instance or ``None``. .. method:: findall(match) Finds all matching subelements, by tag name or path. Returns a list containing all matching elements in document order. .. method:: findtext(match, default=None) Finds text for the first subelement matching *match*. *match* may be a tag name or path. Returns the text content of the first matching element, or *default* if no element was found. Note that if the matching element has no text content an empty string is returned. .. method:: getchildren() .. deprecated:: 2.7 Use ``list(elem)`` or iteration. .. method:: getiterator(tag=None) .. deprecated:: 2.7 Use method :meth:`Element.iter` instead. .. method:: insert(index, element) Inserts a subelement at the given position in this element. .. method:: iter(tag=None) Creates a tree :term:`iterator` with the current element as the root. The iterator iterates over this element and all elements below it, in document (depth first) order. If *tag* is not ``None`` or ``'*'``, only elements whose tag equals *tag* are returned from the iterator. If the tree structure is modified during iteration, the result is undefined. .. versionadded:: 2.7 .. method:: iterfind(match) Finds all matching subelements, by tag name or path. Returns an iterable yielding all matching elements in document order. .. versionadded:: 2.7 .. method:: itertext() Creates a text iterator. The iterator loops over this element and all subelements, in document order, and returns all inner text. .. versionadded:: 2.7 .. method:: makeelement(tag, attrib) Creates a new element object of the same type as this element. Do not call this method, use the :func:`SubElement` factory function instead. .. method:: remove(subelement) Removes *subelement* from the element. Unlike the find\* methods this method compares elements based on the instance identity, not on tag value or contents. :class:`Element` objects also support the following sequence type methods for working with subelements: :meth:`~object.__delitem__`, :meth:`~object.__getitem__`, :meth:`~object.__setitem__`, :meth:`~object.__len__`. Caution: Elements with no subelements will test as ``False``. This behavior will change in future versions. Use specific ``len(elem)`` or ``elem is None`` test instead. :: element = root.find('foo') if not element: # careful! print "element not found, or element has no subelements" if element is None: print "element not found" .. _elementtree-elementtree-objects: ElementTree Objects ^^^^^^^^^^^^^^^^^^^ .. class:: ElementTree(element=None, file=None) ElementTree wrapper class. This class represents an entire element hierarchy, and adds some extra support for serialization to and from standard XML. *element* is the root element. The tree is initialized with the contents of the XML *file* if given. .. method:: _setroot(element) Replaces the root element for this tree. This discards the current contents of the tree, and replaces it with the given element. Use with care. *element* is an element instance. .. method:: find(match) Same as :meth:`Element.find`, starting at the root of the tree. .. method:: findall(match) Same as :meth:`Element.findall`, starting at the root of the tree. .. method:: findtext(match, default=None) Same as :meth:`Element.findtext`, starting at the root of the tree. .. method:: getiterator(tag=None) .. deprecated:: 2.7 Use method :meth:`ElementTree.iter` instead. .. method:: getroot() Returns the root element for this tree. .. method:: iter(tag=None) Creates and returns a tree iterator for the root element. The iterator loops over all elements in this tree, in section order. *tag* is the tag to look for (default is to return all elements). .. method:: iterfind(match) Finds all matching subelements, by tag name or path. Same as getroot().iterfind(match). Returns an iterable yielding all matching elements in document order. .. versionadded:: 2.7 .. method:: parse(source, parser=None) Loads an external XML section into this element tree. *source* is a file name or file object. *parser* is an optional parser instance. If not given, the standard XMLParser parser is used. Returns the section root element. .. method:: write(file, encoding="us-ascii", xml_declaration=None, \ default_namespace=None, method="xml") Writes the element tree to a file, as XML. *file* is a file name, or a file object opened for writing. *encoding* [1]_ is the output encoding (default is US-ASCII). *xml_declaration* controls if an XML declaration should be added to the file. Use ``False`` for never, ``True`` for always, ``None`` for only if not US-ASCII or UTF-8 (default is ``None``). *default_namespace* sets the default XML namespace (for "xmlns"). *method* is either ``"xml"``, ``"html"`` or ``"text"`` (default is ``"xml"``). Returns an encoded string. This is the XML file that is going to be manipulated:: <html> <head> <title>Example page</title> </head> <body> <p>Moved to <a href="http://example.org/">example.org</a> or <a href="http://example.com/">example.com</a>.</p> </body> </html> Example of changing the attribute "target" of every link in first paragraph:: >>> from xml.etree.ElementTree import ElementTree >>> tree = ElementTree() >>> tree.parse("index.xhtml") <Element 'html' at 0xb77e6fac> >>> p = tree.find("body/p") # Finds first occurrence of tag p in body >>> p <Element 'p' at 0xb77ec26c> >>> links = list(p.iter("a")) # Returns list of all links >>> links [<Element 'a' at 0xb77ec2ac>, <Element 'a' at 0xb77ec1cc>] >>> for i in links: # Iterates through all found links ... i.attrib["target"] = "blank" ... >>> tree.write("output.xhtml") .. _elementtree-qname-objects: QName Objects ^^^^^^^^^^^^^ .. class:: QName(text_or_uri, tag=None) QName wrapper. This can be used to wrap a QName attribute value, in order to get proper namespace handling on output. *text_or_uri* is a string containing the QName value, in the form {uri}local, or, if the tag argument is given, the URI part of a QName. If *tag* is given, the first argument is interpreted as a URI, and this argument is interpreted as a local name. :class:`QName` instances are opaque. .. _elementtree-treebuilder-objects: TreeBuilder Objects ^^^^^^^^^^^^^^^^^^^ .. class:: TreeBuilder(element_factory=None) Generic element structure builder. This builder converts a sequence of start, data, and end method calls to a well-formed element structure. You can use this class to build an element structure using a custom XML parser, or a parser for some other XML-like format. The *element_factory* is called to create new :class:`Element` instances when given. .. method:: close() Flushes the builder buffers, and returns the toplevel document element. Returns an :class:`Element` instance. .. method:: data(data) Adds text to the current element. *data* is a string. This should be either a bytestring, or a Unicode string. .. method:: end(tag) Closes the current element. *tag* is the element name. Returns the closed element. .. method:: start(tag, attrs) Opens a new element. *tag* is the element name. *attrs* is a dictionary containing element attributes. Returns the opened element. In addition, a custom :class:`TreeBuilder` object can provide the following method: .. method:: doctype(name, pubid, system) Handles a doctype declaration. *name* is the doctype name. *pubid* is the public identifier. *system* is the system identifier. This method does not exist on the default :class:`TreeBuilder` class. .. versionadded:: 2.7 .. _elementtree-xmlparser-objects: XMLParser Objects ^^^^^^^^^^^^^^^^^ .. class:: XMLParser(html=0, target=None, encoding=None) :class:`Element` structure builder for XML source data, based on the expat parser. *html* are predefined HTML entities. This flag is not supported by the current implementation. *target* is the target object. If omitted, the builder uses an instance of the standard TreeBuilder class. *encoding* [1]_ is optional. If given, the value overrides the encoding specified in the XML file. .. method:: close() Finishes feeding data to the parser. Returns an element structure. .. method:: doctype(name, pubid, system) .. deprecated:: 2.7 Define the :meth:`TreeBuilder.doctype` method on a custom TreeBuilder target. .. method:: feed(data) Feeds data to the parser. *data* is encoded data. :meth:`XMLParser.feed` calls *target*\'s :meth:`start` method for each opening tag, its :meth:`end` method for each closing tag, and data is processed by method :meth:`data`. :meth:`XMLParser.close` calls *target*\'s method :meth:`close`. :class:`XMLParser` can be used not only for building a tree structure. This is an example of counting the maximum depth of an XML file:: >>> from xml.etree.ElementTree import XMLParser >>> class MaxDepth: # The target object of the parser ... maxDepth = 0 ... depth = 0 ... def start(self, tag, attrib): # Called for each opening tag. ... self.depth += 1 ... if self.depth > self.maxDepth: ... self.maxDepth = self.depth ... def end(self, tag): # Called for each closing tag. ... self.depth -= 1 ... def data(self, data): ... pass # We do not need to do anything with data. ... def close(self): # Called when all data has been parsed. ... return self.maxDepth ... >>> target = MaxDepth() >>> parser = XMLParser(target=target) >>> exampleXml = """ ... <a> ... <b> ... </b> ... <b> ... <c> ... <d> ... </d> ... </c> ... </b> ... </a>""" >>> parser.feed(exampleXml) >>> parser.close() 4 .. rubric:: Footnotes .. [1] The encoding string included in XML output should conform to the appropriate standards. For example, "UTF-8" is valid, but "UTF8" is not. See https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-EncodingDecl and https://www.iana.org/assignments/character-sets/character-sets.xhtml.
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