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2to3.rst.txt
14.3
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__builtin__.rst.txt
1.46
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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
5.18
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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
10.28
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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
1015
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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
1.87
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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
7.47
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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
3.69
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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
19.15
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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
2.24
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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
73.12
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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
72.25
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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
2.14
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runpy.rst.txt
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sched.rst.txt
4.54
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scrolledtext.rst.txt
1.35
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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
39.81
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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
34.39
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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 : bisect.rst.txt
:mod:`bisect` --- Array bisection algorithm =========================================== .. module:: bisect :synopsis: Array bisection algorithms for binary searching. .. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org> .. sectionauthor:: Raymond Hettinger <python at rcn.com> .. example based on the PyModules FAQ entry by Aaron Watters <arw@pythonpros.com> .. versionadded:: 2.1 **Source code:** :source:`Lib/bisect.py` -------------- This module provides support for maintaining a list in sorted order without having to sort the list after each insertion. For long lists of items with expensive comparison operations, this can be an improvement over the more common approach. The module is called :mod:`bisect` because it uses a basic bisection algorithm to do its work. The source code may be most useful as a working example of the algorithm (the boundary conditions are already right!). The following functions are provided: .. function:: bisect_left(a, x, lo=0, hi=len(a)) Locate the insertion point for *x* in *a* to maintain sorted order. The parameters *lo* and *hi* may be used to specify a subset of the list which should be considered; by default the entire list is used. If *x* is already present in *a*, the insertion point will be before (to the left of) any existing entries. The return value is suitable for use as the first parameter to ``list.insert()`` assuming that *a* is already sorted. The returned insertion point *i* partitions the array *a* into two halves so that ``all(val < x for val in a[lo:i])`` for the left side and ``all(val >= x for val in a[i:hi])`` for the right side. .. function:: bisect_right(a, x, lo=0, hi=len(a)) bisect(a, x, lo=0, hi=len(a)) Similar to :func:`bisect_left`, but returns an insertion point which comes after (to the right of) any existing entries of *x* in *a*. The returned insertion point *i* partitions the array *a* into two halves so that ``all(val <= x for val in a[lo:i])`` for the left side and ``all(val > x for val in a[i:hi])`` for the right side. .. function:: insort_left(a, x, lo=0, hi=len(a)) Insert *x* in *a* in sorted order. This is equivalent to ``a.insert(bisect.bisect_left(a, x, lo, hi), x)`` assuming that *a* is already sorted. Keep in mind that the O(log n) search is dominated by the slow O(n) insertion step. .. function:: insort_right(a, x, lo=0, hi=len(a)) insort(a, x, lo=0, hi=len(a)) Similar to :func:`insort_left`, but inserting *x* in *a* after any existing entries of *x*. .. seealso:: `SortedCollection recipe <https://code.activestate.com/recipes/577197-sortedcollection/>`_ that uses bisect to build a full-featured collection class with straight-forward search methods and support for a key-function. The keys are precomputed to save unnecessary calls to the key function during searches. Searching Sorted Lists ---------------------- The above :func:`bisect` functions are useful for finding insertion points but can be tricky or awkward to use for common searching tasks. The following five functions show how to transform them into the standard lookups for sorted lists:: def index(a, x): 'Locate the leftmost value exactly equal to x' i = bisect_left(a, x) if i != len(a) and a[i] == x: return i raise ValueError def find_lt(a, x): 'Find rightmost value less than x' i = bisect_left(a, x) if i: return a[i-1] raise ValueError def find_le(a, x): 'Find rightmost value less than or equal to x' i = bisect_right(a, x) if i: return a[i-1] raise ValueError def find_gt(a, x): 'Find leftmost value greater than x' i = bisect_right(a, x) if i != len(a): return a[i] raise ValueError def find_ge(a, x): 'Find leftmost item greater than or equal to x' i = bisect_left(a, x) if i != len(a): return a[i] raise ValueError Other Examples -------------- .. _bisect-example: The :func:`bisect` function can be useful for numeric table lookups. This example uses :func:`bisect` to look up a letter grade for an exam score (say) based on a set of ordered numeric breakpoints: 90 and up is an 'A', 80 to 89 is a 'B', and so on:: >>> def grade(score, breakpoints=[60, 70, 80, 90], grades='FDCBA'): i = bisect(breakpoints, score) return grades[i] >>> [grade(score) for score in [33, 99, 77, 70, 89, 90, 100]] ['F', 'A', 'C', 'C', 'B', 'A', 'A'] Unlike the :func:`sorted` function, it does not make sense for the :func:`bisect` functions to have *key* or *reversed* arguments because that would lead to an inefficient design (successive calls to bisect functions would not "remember" all of the previous key lookups). Instead, it is better to search a list of precomputed keys to find the index of the record in question:: >>> data = [('red', 5), ('blue', 1), ('yellow', 8), ('black', 0)] >>> data.sort(key=lambda r: r[1]) >>> keys = [r[1] for r in data] # precomputed list of keys >>> data[bisect_left(keys, 0)] ('black', 0) >>> data[bisect_left(keys, 1)] ('blue', 1) >>> data[bisect_left(keys, 5)] ('red', 5) >>> data[bisect_left(keys, 8)] ('yellow', 8)
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