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<section id="floating-point-objects">
<span id="floatobjects"></span><h1>Floating-Point Objects<a class="headerlink" href="#floating-point-objects" title="Link to this heading">¶</a></h1>
<dl class="c type" id="index-0">
<dt class="sig sig-object c" id="c.PyFloatObject">
<span class="k"><span class="pre">type</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloatObject</span></span></span><a class="headerlink" href="#c.PyFloatObject" title="Link to this definition">¶</a><br /></dt>
<dd><p>This subtype of <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyObject</span></code></a> represents a Python floating-point object.</p>
</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"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_Type</span></span></span><a class="headerlink" href="#c.PyFloat_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> قسمتی از <a class="reference internal" href="stable.html#stable"><span class="std std-ref">ABI پایدار</span></a>.</em><p>This instance of <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyTypeObject</span></code></a> represents the Python floating-point
type. This is the same object as <a class="reference internal" href="../library/functions.html#float" title="float"><code class="xref py py-class docutils literal notranslate"><span class="pre">float</span></code></a> in the Python layer.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_Check">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_Check</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_Check" title="Link to this definition">¶</a><br /></dt>
<dd><p>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"><span class="pre">PyFloatObject</span></code></a> or a subtype of
<code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code>. This function always succeeds.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_CheckExact">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_CheckExact</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_CheckExact" title="Link to this definition">¶</a><br /></dt>
<dd><p>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"><span class="pre">PyFloatObject</span></code></a>, but not a subtype of
<code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code>. This function always succeeds.</p>
</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"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_FromString</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">str</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_FromString" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">مقدار بازگشتی: مرجع جدید.</em><em class="stableabi"> قسمتی از <a class="reference internal" href="stable.html#stable"><span class="std std-ref">ABI پایدار</span></a>.</em><p>Create a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code></a> object based on the string value in <em>str</em>, or
<code class="docutils literal notranslate"><span class="pre">NULL</span></code> on failure.</p>
</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"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_FromDouble</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="n"><span class="pre">v</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_FromDouble" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">مقدار بازگشتی: مرجع جدید.</em><em class="stableabi"> قسمتی از <a class="reference internal" href="stable.html#stable"><span class="std std-ref">ABI پایدار</span></a>.</em><p>Create a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code></a> object from <em>v</em>, or <code class="docutils literal notranslate"><span class="pre">NULL</span></code> on failure.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_AsDouble">
<span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_AsDouble</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">pyfloat</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_AsDouble" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> قسمتی از <a class="reference internal" href="stable.html#stable"><span class="std std-ref">ABI پایدار</span></a>.</em><p>Return a C <span class="c-expr sig sig-inline c"><span class="kt">double</span></span> representation of the contents of <em>pyfloat</em>. If
<em>pyfloat</em> is not a Python floating-point object but has a <a class="reference internal" href="../reference/datamodel.html#object.__float__" title="object.__float__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__float__()</span></code></a>
method, this method will first be called to convert <em>pyfloat</em> into a float.
If <code class="xref py py-meth docutils literal notranslate"><span class="pre">__float__()</span></code> is not defined then it falls back to <a class="reference internal" href="../reference/datamodel.html#object.__index__" title="object.__index__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__index__()</span></code></a>.
This method returns <code class="docutils literal notranslate"><span class="pre">-1.0</span></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"><span class="pre">PyErr_Occurred()</span></code></a> to check for errors.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">تغییر داده شده در نسخه 3.8: </span>Use <a class="reference internal" href="../reference/datamodel.html#object.__index__" title="object.__index__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__index__()</span></code></a> if available.</p>
</div>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_AS_DOUBLE">
<span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_AS_DOUBLE</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">pyfloat</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_AS_DOUBLE" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return a C <span class="c-expr sig sig-inline c"><span class="kt">double</span></span> representation of the contents of <em>pyfloat</em>, but
without error checking.</p>
</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"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_GetInfo</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">void</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_GetInfo" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">مقدار بازگشتی: مرجع جدید.</em><em class="stableabi"> قسمتی از <a class="reference internal" href="stable.html#stable"><span class="std std-ref">ABI پایدار</span></a>.</em><p>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"><span class="pre">float.h</span></code>.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_GetMax">
<span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_GetMax</span></span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_GetMax" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> قسمتی از <a class="reference internal" href="stable.html#stable"><span class="std std-ref">ABI پایدار</span></a>.</em><p>Return the maximum representable finite float <em>DBL_MAX</em> as C <span class="c-expr sig sig-inline c"><span class="kt">double</span></span>.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_GetMin">
<span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_GetMin</span></span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_GetMin" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> قسمتی از <a class="reference internal" href="stable.html#stable"><span class="std std-ref">ABI پایدار</span></a>.</em><p>Return the minimum normalized positive float <em>DBL_MIN</em> as C <span class="c-expr sig sig-inline c"><span class="kt">double</span></span>.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_INFINITY">
<span class="sig-name descname"><span class="n"><span class="pre">Py_INFINITY</span></span></span><a class="headerlink" href="#c.Py_INFINITY" title="Link to this definition">¶</a><br /></dt>
<dd><p>This macro expands to a constant expression of type <span class="c-expr sig sig-inline c"><span class="kt">double</span></span>, that
represents the positive infinity.</p>
<p>On most platforms, this is equivalent to the <code class="xref c c-macro docutils literal notranslate"><span class="pre">INFINITY</span></code> macro from
the C11 standard <code class="docutils literal notranslate"><span class="pre"><math.h></span></code> header.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_NAN">
<span class="sig-name descname"><span class="n"><span class="pre">Py_NAN</span></span></span><a class="headerlink" href="#c.Py_NAN" title="Link to this definition">¶</a><br /></dt>
<dd><p>This macro expands to a constant expression of type <span class="c-expr sig sig-inline c"><span class="kt">double</span></span>, that
represents a quiet not-a-number (qNaN) value.</p>
<p>On most platforms, this is equivalent to the <code class="xref c c-macro docutils literal notranslate"><span class="pre">NAN</span></code> macro from
the C11 standard <code class="docutils literal notranslate"><span class="pre"><math.h></span></code> header.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_HUGE_VAL">
<span class="sig-name descname"><span class="n"><span class="pre">Py_HUGE_VAL</span></span></span><a class="headerlink" href="#c.Py_HUGE_VAL" title="Link to this definition">¶</a><br /></dt>
<dd><p>Equivalent to <code class="xref c c-macro docutils literal notranslate"><span class="pre">INFINITY</span></code>.</p>
<div class="deprecated">
<p><span class="versionmodified deprecated">منسوخ شده از نسخه 3.14: </span>The macro is <a class="reference internal" href="../glossary.html#term-soft-deprecated"><span class="xref std std-term">soft deprecated</span></a>.</p>
</div>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_MATH_E">
<span class="sig-name descname"><span class="n"><span class="pre">Py_MATH_E</span></span></span><a class="headerlink" href="#c.Py_MATH_E" title="Link to this definition">¶</a><br /></dt>
<dd><p>The definition (accurate for a <span class="c-expr sig sig-inline c"><span class="kt">double</span></span> type) of the <a class="reference internal" href="../library/math.html#math.e" title="math.e"><code class="xref py py-data docutils literal notranslate"><span class="pre">math.e</span></code></a> constant.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_MATH_El">
<span class="sig-name descname"><span class="n"><span class="pre">Py_MATH_El</span></span></span><a class="headerlink" href="#c.Py_MATH_El" title="Link to this definition">¶</a><br /></dt>
<dd><p>High precision (long double) definition of <a class="reference internal" href="../library/math.html#math.e" title="math.e"><code class="xref py py-data docutils literal notranslate"><span class="pre">e</span></code></a> constant.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_MATH_PI">
<span class="sig-name descname"><span class="n"><span class="pre">Py_MATH_PI</span></span></span><a class="headerlink" href="#c.Py_MATH_PI" title="Link to this definition">¶</a><br /></dt>
<dd><p>The definition (accurate for a <span class="c-expr sig sig-inline c"><span class="kt">double</span></span> type) of the <a class="reference internal" href="../library/math.html#math.pi" title="math.pi"><code class="xref py py-data docutils literal notranslate"><span class="pre">math.pi</span></code></a> constant.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_MATH_PIl">
<span class="sig-name descname"><span class="n"><span class="pre">Py_MATH_PIl</span></span></span><a class="headerlink" href="#c.Py_MATH_PIl" title="Link to this definition">¶</a><br /></dt>
<dd><p>High precision (long double) definition of <a class="reference internal" href="../library/math.html#math.pi" title="math.pi"><code class="xref py py-data docutils literal notranslate"><span class="pre">pi</span></code></a> constant.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_MATH_TAU">
<span class="sig-name descname"><span class="n"><span class="pre">Py_MATH_TAU</span></span></span><a class="headerlink" href="#c.Py_MATH_TAU" title="Link to this definition">¶</a><br /></dt>
<dd><p>The definition (accurate for a <span class="c-expr sig sig-inline c"><span class="kt">double</span></span> type) of the <a class="reference internal" href="../library/math.html#math.tau" title="math.tau"><code class="xref py py-data docutils literal notranslate"><span class="pre">math.tau</span></code></a> constant.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.6.</span></p>
</div>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_RETURN_NAN">
<span class="sig-name descname"><span class="n"><span class="pre">Py_RETURN_NAN</span></span></span><a class="headerlink" href="#c.Py_RETURN_NAN" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return <a class="reference internal" href="../library/math.html#math.nan" title="math.nan"><code class="xref py py-data docutils literal notranslate"><span class="pre">math.nan</span></code></a> from a function.</p>
<p>On most platforms, this is equivalent to <code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">PyFloat_FromDouble(NAN)</span></code>.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_RETURN_INF">
<span class="sig-name descname"><span class="n"><span class="pre">Py_RETURN_INF</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">sign</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.Py_RETURN_INF" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return <a class="reference internal" href="../library/math.html#math.inf" title="math.inf"><code class="xref py py-data docutils literal notranslate"><span class="pre">math.inf</span></code></a> or <code class="xref py py-data docutils literal notranslate"><span class="pre">-math.inf</span></code> from a function,
depending on the sign of <em>sign</em>.</p>
<p>On most platforms, this is equivalent to the following:</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">return</span><span class="w"> </span><span class="n">PyFloat_FromDouble</span><span class="p">(</span><span class="n">copysign</span><span class="p">(</span><span class="n">INFINITY</span><span class="p">,</span><span class="w"> </span><span class="n">sign</span><span class="p">));</span>
</pre></div>
</div>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_IS_FINITE">
<span class="sig-name descname"><span class="n"><span class="pre">Py_IS_FINITE</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">X</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.Py_IS_FINITE" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">1</span></code> if the given floating-point number <em>X</em> is finite,
that is, it is normal, subnormal or zero, but not infinite or NaN.
Return <code class="docutils literal notranslate"><span class="pre">0</span></code> otherwise.</p>
<div class="deprecated">
<p><span class="versionmodified deprecated">منسوخ شده از نسخه 3.14: </span>The macro is <a class="reference internal" href="../glossary.html#term-soft-deprecated"><span class="xref std std-term">soft deprecated</span></a>. Use <code class="xref c c-macro docutils literal notranslate"><span class="pre">isfinite</span></code> instead.</p>
</div>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_IS_INFINITY">
<span class="sig-name descname"><span class="n"><span class="pre">Py_IS_INFINITY</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">X</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.Py_IS_INFINITY" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">1</span></code> if the given floating-point number <em>X</em> is positive or negative
infinity. Return <code class="docutils literal notranslate"><span class="pre">0</span></code> otherwise.</p>
<div class="deprecated">
<p><span class="versionmodified deprecated">منسوخ شده از نسخه 3.14: </span>The macro is <a class="reference internal" href="../glossary.html#term-soft-deprecated"><span class="xref std std-term">soft deprecated</span></a>. Use <code class="xref c c-macro docutils literal notranslate"><span class="pre">isinf</span></code> instead.</p>
</div>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.Py_IS_NAN">
<span class="sig-name descname"><span class="n"><span class="pre">Py_IS_NAN</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">X</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.Py_IS_NAN" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">1</span></code> if the given floating-point number <em>X</em> is a not-a-number (NaN)
value. Return <code class="docutils literal notranslate"><span class="pre">0</span></code> otherwise.</p>
<div class="deprecated">
<p><span class="versionmodified deprecated">منسوخ شده از نسخه 3.14: </span>The macro is <a class="reference internal" href="../glossary.html#term-soft-deprecated"><span class="xref std std-term">soft deprecated</span></a>. Use <code class="xref c c-macro docutils literal notranslate"><span class="pre">isnan</span></code> instead.</p>
</div>
</dd></dl>
<section id="pack-and-unpack-functions">
<h2>Pack and Unpack functions<a class="headerlink" href="#pack-and-unpack-functions" title="Link to this heading">¶</a></h2>
<p>The pack and unpack functions provide an efficient platform-independent way to
store floating-point values as byte strings. The Pack routines produce a bytes
string from a C <span class="c-expr sig sig-inline c"><span class="kt">double</span></span>, and the Unpack routines produce a C
<span class="c-expr sig sig-inline c"><span class="kt">double</span></span> from such a bytes string. The suffix (2, 4 or 8) specifies the
number of bytes in the bytes string.</p>
<p>On platforms that appear to use IEEE 754 formats these functions work by
copying bits. On other platforms, the 2-byte format is identical to the IEEE
754 binary16 half-precision format, the 4-byte format (32-bit) is identical to
the IEEE 754 binary32 single precision format, and the 8-byte format to the
IEEE 754 binary64 double precision format, although the packing of INFs and
NaNs (if such things exist on the platform) isn't handled correctly, and
attempting to unpack a bytes string containing an IEEE INF or NaN will raise an
exception.</p>
<p>Note that NaN type may not be preserved on IEEE platforms (signaling NaNs become
quiet NaNs), for example on x86 systems in 32-bit mode.</p>
<p>On non-IEEE platforms with more precision, or larger dynamic range, than IEEE
754 supports, not all values can be packed; on non-IEEE platforms with less
precision, or smaller dynamic range, not all values can be unpacked. What
happens in such cases is partly accidental (alas).</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.11.</span></p>
</div>
<section id="pack-functions">
<h3>Pack functions<a class="headerlink" href="#pack-functions" title="Link to this heading">¶</a></h3>
<p>The pack routines write 2, 4 or 8 bytes, starting at <em>p</em>. <em>le</em> is an
<span class="c-expr sig sig-inline c"><span class="kt">int</span></span> argument, non-zero if you want the bytes string in little-endian
format (exponent last, at <code class="docutils literal notranslate"><span class="pre">p+1</span></code>, <code class="docutils literal notranslate"><span class="pre">p+3</span></code>, or <code class="docutils literal notranslate"><span class="pre">p+6</span></code> and <code class="docutils literal notranslate"><span class="pre">p+7</span></code>), zero if you
want big-endian format (exponent first, at <em>p</em>). The <code class="xref c c-macro docutils literal notranslate"><span class="pre">PY_BIG_ENDIAN</span></code>
constant can be used to use the native endian: it is equal to <code class="docutils literal notranslate"><span class="pre">1</span></code> on big
endian processor, or <code class="docutils literal notranslate"><span class="pre">0</span></code> on little endian processor.</p>
<p>Return value: <code class="docutils literal notranslate"><span class="pre">0</span></code> if all is OK, <code class="docutils literal notranslate"><span class="pre">-1</span></code> if error (and an exception is set,
most likely <a class="reference internal" href="../library/exceptions.html#OverflowError" title="OverflowError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OverflowError</span></code></a>).</p>
<p>There are two problems on non-IEEE platforms:</p>
<ul class="simple">
<li><p>What this does is undefined if <em>x</em> is a NaN or infinity.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">-0.0</span></code> and <code class="docutils literal notranslate"><span class="pre">+0.0</span></code> produce the same bytes string.</p></li>
</ul>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_Pack2">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_Pack2</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="n"><span class="pre">x</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">le</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_Pack2" title="Link to this definition">¶</a><br /></dt>
<dd><p>Pack a C double as the IEEE 754 binary16 half-precision format.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_Pack4">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_Pack4</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="n"><span class="pre">x</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">le</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_Pack4" title="Link to this definition">¶</a><br /></dt>
<dd><p>Pack a C double as the IEEE 754 binary32 single precision format.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_Pack8">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_Pack8</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="n"><span class="pre">x</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">le</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_Pack8" title="Link to this definition">¶</a><br /></dt>
<dd><p>Pack a C double as the IEEE 754 binary64 double precision format.</p>
</dd></dl>
</section>
<section id="unpack-functions">
<h3>Unpack functions<a class="headerlink" href="#unpack-functions" title="Link to this heading">¶</a></h3>
<p>The unpack routines read 2, 4 or 8 bytes, starting at <em>p</em>. <em>le</em> is an
<span class="c-expr sig sig-inline c"><span class="kt">int</span></span> argument, non-zero if the bytes string is in little-endian format
(exponent last, at <code class="docutils literal notranslate"><span class="pre">p+1</span></code>, <code class="docutils literal notranslate"><span class="pre">p+3</span></code> or <code class="docutils literal notranslate"><span class="pre">p+6</span></code> and <code class="docutils literal notranslate"><span class="pre">p+7</span></code>), zero if big-endian
(exponent first, at <em>p</em>). The <code class="xref c c-macro docutils literal notranslate"><span class="pre">PY_BIG_ENDIAN</span></code> constant can be used to
use the native endian: it is equal to <code class="docutils literal notranslate"><span class="pre">1</span></code> on big endian processor, or <code class="docutils literal notranslate"><span class="pre">0</span></code>
on little endian processor.</p>
<p>Return value: The unpacked double. On error, this is <code class="docutils literal notranslate"><span class="pre">-1.0</span></code> and
<a class="reference internal" href="exceptions.html#c.PyErr_Occurred" title="PyErr_Occurred"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyErr_Occurred()</span></code></a> is true (and an exception is set, most likely
<a class="reference internal" href="../library/exceptions.html#OverflowError" title="OverflowError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OverflowError</span></code></a>).</p>
<p>Note that on a non-IEEE platform this will refuse to unpack a bytes string that
represents a NaN or infinity.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_Unpack2">
<span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_Unpack2</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">le</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_Unpack2" title="Link to this definition">¶</a><br /></dt>
<dd><p>Unpack the IEEE 754 binary16 half-precision format as a C double.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_Unpack4">
<span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_Unpack4</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">le</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_Unpack4" title="Link to this definition">¶</a><br /></dt>
<dd><p>Unpack the IEEE 754 binary32 single precision format as a C double.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyFloat_Unpack8">
<span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFloat_Unpack8</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">le</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_Unpack8" title="Link to this definition">¶</a><br /></dt>
<dd><p>Unpack the IEEE 754 binary64 double precision format as a C double.</p>
</dd></dl>
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