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Code Editor : float.html

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<title>Floating Point Objects &#8212; Python 2.7.18 documentation</title>
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 <section id="floating-point-objects">
<h1>Floating Point Objects<a class="headerlink" href="#floating-point-objects" title="Permalink to this headline">¶</a></h1>
<dl class="c type">
<dt class="sig sig-object c" id="c.PyFloatObject">
type PyFloatObject<a class="headerlink" href="#c.PyFloatObject" title="Permalink to this definition">¶</a> </dt>
<dd>This subtype of <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><code class="xref c c-type docutils literal notranslate">PyObject</code></a> represents a Python floating point object.
</dd></dl>

<dl class="c var">
<dt class="sig sig-object c" id="c.PyFloat_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> PyFloat_Type<a class="headerlink" href="#c.PyFloat_Type" title="Permalink to this definition">¶</a> </dt>
<dd>This instance of <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><code class="xref c c-type docutils literal notranslate">PyTypeObject</code></a> represents the Python floating point
type. This is the same object as <code class="docutils literal notranslate">float</code> and <code class="docutils literal notranslate">types.FloatType</code>.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_Check">
int PyFloat_Check(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *p)<a class="headerlink" href="#c.PyFloat_Check" title="Permalink to this definition">¶</a> </dt>
<dd>Return true if its argument is a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate">PyFloatObject</code></a> or a subtype of
<a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate">PyFloatObject</code></a>.
<div class="versionchanged">
Changed in version 2.2: Allowed subtypes to be accepted.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_CheckExact">
int PyFloat_CheckExact(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *p)<a class="headerlink" href="#c.PyFloat_CheckExact" title="Permalink to this definition">¶</a> </dt>
<dd>Return true if its argument is a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate">PyFloatObject</code></a>, but not a subtype of
<a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate">PyFloatObject</code></a>.
<div class="versionadded">
New in version 2.2.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_FromString">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PyFloat_FromString(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *str, char **pend)<a class="headerlink" href="#c.PyFloat_FromString" title="Permalink to this definition">¶</a> </dt>
<dd>Create a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate">PyFloatObject</code></a> object based on the string value in str, or
NULL on failure. The pend argument is ignored. It remains only for
backward compatibility.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_FromDouble">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PyFloat_FromDouble(double v)<a class="headerlink" href="#c.PyFloat_FromDouble" title="Permalink to this definition">¶</a> </dt>
<dd>Create a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate">PyFloatObject</code></a> object from v, or NULL on failure.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_AsDouble">
double PyFloat_AsDouble(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *pyfloat)<a class="headerlink" href="#c.PyFloat_AsDouble" title="Permalink to this definition">¶</a> </dt>
<dd>Return a C <code class="xref c c-type docutils literal notranslate">double</code> representation of the contents of pyfloat. If
pyfloat is not a Python floating point object but has a <code class="xref py py-meth docutils literal notranslate">__float__()</code>
method, this method will first be called to convert pyfloat into a float.
This method returns <code class="docutils literal notranslate">-1.0</code> upon failure, so one should call
<a class="reference internal" href="exceptions.html#c.PyErr_Occurred" title="PyErr_Occurred"><code class="xref c c-func docutils literal notranslate">PyErr_Occurred()</code></a> to check for errors.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_AS_DOUBLE">
double PyFloat_AS_DOUBLE(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *pyfloat)<a class="headerlink" href="#c.PyFloat_AS_DOUBLE" title="Permalink to this definition">¶</a> </dt>
<dd>Return a C <code class="xref c c-type docutils literal notranslate">double</code> representation of the contents of pyfloat, but
without error checking.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_GetInfo">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PyFloat_GetInfo(void)<a class="headerlink" href="#c.PyFloat_GetInfo" title="Permalink to this definition">¶</a> </dt>
<dd>Return a structseq instance which contains information about the
precision, minimum and maximum values of a float. It’s a thin wrapper
around the header file <code class="file docutils literal notranslate">float.h</code>.
<div class="versionadded">
New in version 2.6.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_GetMax">
double PyFloat_GetMax()<a class="headerlink" href="#c.PyFloat_GetMax" title="Permalink to this definition">¶</a> </dt>
<dd>Return the maximum representable finite float DBL_MAX as C <code class="xref c c-type docutils literal notranslate">double</code>.
<div class="versionadded">
New in version 2.6.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_GetMin">
double PyFloat_GetMin()<a class="headerlink" href="#c.PyFloat_GetMin" title="Permalink to this definition">¶</a> </dt>
<dd>Return the minimum normalized positive float DBL_MIN as C <code class="xref c c-type docutils literal notranslate">double</code>.
<div class="versionadded">
New in version 2.6.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_ClearFreeList">
int PyFloat_ClearFreeList()<a class="headerlink" href="#c.PyFloat_ClearFreeList" title="Permalink to this definition">¶</a> </dt>
<dd>Clear the float free list. Return the number of items that could not
be freed.
<div class="versionadded">
New in version 2.6.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_AsString">
void PyFloat_AsString(char *buf, <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject">PyFloatObject</a> *v)<a class="headerlink" href="#c.PyFloat_AsString" title="Permalink to this definition">¶</a> </dt>
<dd>Convert the argument v to a string, using the same rules as
<a class="reference internal" href="../library/functions.html#str" title="str"><code class="xref py py-func docutils literal notranslate">str()</code></a>. The length of buf should be at least 100.
This function is unsafe to call because it writes to a buffer whose
length it does not know.
<div class="deprecated">
Deprecated since version 2.7: Use <code class="xref py py-func docutils literal notranslate">PyObject_Str()</code> or <code class="xref py py-func docutils literal notranslate">PyOS_double_to_string()</code> instead.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_AsReprString">
void PyFloat_AsReprString(char *buf, <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject">PyFloatObject</a> *v)<a class="headerlink" href="#c.PyFloat_AsReprString" title="Permalink to this definition">¶</a> </dt>
<dd>Same as PyFloat_AsString, except uses the same rules as
<a class="reference internal" href="../library/functions.html#repr" title="repr"><code class="xref py py-func docutils literal notranslate">repr()</code></a>. The length of buf should be at least 100.
This function is unsafe to call because it writes to a buffer whose
length it does not know.
<div class="deprecated">
Deprecated since version 2.7: Use <code class="xref py py-func docutils literal notranslate">PyObject_Repr()</code> or <code class="xref py py-func docutils literal notranslate">PyOS_double_to_string()</code> instead.
</div>
</dd></dl>

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