412 lines
31 KiB
HTML
412 lines
31 KiB
HTML
|
||
<!DOCTYPE html>
|
||
|
||
<html>
|
||
<head>
|
||
<meta charset="utf-8" />
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
|
||
<meta property="og:title" content="String conversion and formatting" />
|
||
<meta property="og:type" content="website" />
|
||
<meta property="og:url" content="https://docs.python.org/3/c-api/conversion.html" />
|
||
<meta property="og:site_name" content="Python documentation" />
|
||
<meta property="og:description" content="Functions for number conversion and formatted string output. PyOS_snprintf() and PyOS_vsnprintf() wrap the Standard C library functions snprintf() and vsnprintf(). Their purpose is to guarantee con..." />
|
||
<meta property="og:image" content="https://docs.python.org/3/_static/og-image.png" />
|
||
<meta property="og:image:alt" content="Python documentation" />
|
||
<meta name="description" content="Functions for number conversion and formatted string output. PyOS_snprintf() and PyOS_vsnprintf() wrap the Standard C library functions snprintf() and vsnprintf(). Their purpose is to guarantee con..." />
|
||
<meta property="og:image:width" content="200" />
|
||
<meta property="og:image:height" content="200" />
|
||
<meta name="theme-color" content="#3776ab" />
|
||
|
||
<title>String conversion and formatting — Python 3.12.0 documentation</title><meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||
|
||
<link rel="stylesheet" type="text/css" href="../_static/pygments.css" />
|
||
<link rel="stylesheet" type="text/css" href="../_static/pydoctheme.css?digest=b37c26da2f7529d09fe70b41c4b2133fe4931a90" />
|
||
<link id="pygments_dark_css" media="(prefers-color-scheme: dark)" rel="stylesheet" type="text/css" href="../_static/pygments_dark.css" />
|
||
|
||
<script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script>
|
||
<script src="../_static/jquery.js"></script>
|
||
<script src="../_static/underscore.js"></script>
|
||
<script src="../_static/doctools.js"></script>
|
||
|
||
<script src="../_static/sidebar.js"></script>
|
||
|
||
<link rel="search" type="application/opensearchdescription+xml"
|
||
title="Search within Python 3.12.0 documentation"
|
||
href="../_static/opensearch.xml"/>
|
||
<link rel="author" title="About these documents" href="../about.html" />
|
||
<link rel="index" title="Index" href="../genindex.html" />
|
||
<link rel="search" title="Search" href="../search.html" />
|
||
<link rel="copyright" title="Copyright" href="../copyright.html" />
|
||
<link rel="next" title="Reflection" href="reflection.html" />
|
||
<link rel="prev" title="Parsing arguments and building values" href="arg.html" />
|
||
<link rel="canonical" href="https://docs.python.org/3/c-api/conversion.html" />
|
||
|
||
|
||
|
||
|
||
|
||
<style>
|
||
@media only screen {
|
||
table.full-width-table {
|
||
width: 100%;
|
||
}
|
||
}
|
||
</style>
|
||
<link rel="stylesheet" href="../_static/pydoctheme_dark.css" media="(prefers-color-scheme: dark)" id="pydoctheme_dark_css">
|
||
<link rel="shortcut icon" type="image/png" href="../_static/py.svg" />
|
||
<script type="text/javascript" src="../_static/copybutton.js"></script>
|
||
<script type="text/javascript" src="../_static/menu.js"></script>
|
||
<script type="text/javascript" src="../_static/themetoggle.js"></script>
|
||
|
||
</head>
|
||
<body>
|
||
<div class="mobile-nav">
|
||
<input type="checkbox" id="menuToggler" class="toggler__input" aria-controls="navigation"
|
||
aria-pressed="false" aria-expanded="false" role="button" aria-label="Menu" />
|
||
<nav class="nav-content" role="navigation">
|
||
<label for="menuToggler" class="toggler__label">
|
||
<span></span>
|
||
</label>
|
||
<span class="nav-items-wrapper">
|
||
<a href="https://www.python.org/" class="nav-logo">
|
||
<img src="../_static/py.svg" alt="Logo"/>
|
||
</a>
|
||
<span class="version_switcher_placeholder"></span>
|
||
<form role="search" class="search" action="../search.html" method="get">
|
||
<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" class="search-icon">
|
||
<path fill-rule="nonzero" fill="currentColor" d="M15.5 14h-.79l-.28-.27a6.5 6.5 0 001.48-5.34c-.47-2.78-2.79-5-5.59-5.34a6.505 6.505 0 00-7.27 7.27c.34 2.8 2.56 5.12 5.34 5.59a6.5 6.5 0 005.34-1.48l.27.28v.79l4.25 4.25c.41.41 1.08.41 1.49 0 .41-.41.41-1.08 0-1.49L15.5 14zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z"></path>
|
||
</svg>
|
||
<input placeholder="Quick search" aria-label="Quick search" type="search" name="q" />
|
||
<input type="submit" value="Go"/>
|
||
</form>
|
||
</span>
|
||
</nav>
|
||
<div class="menu-wrapper">
|
||
<nav class="menu" role="navigation" aria-label="main navigation">
|
||
<div class="language_switcher_placeholder"></div>
|
||
|
||
<label class="theme-selector-label">
|
||
Theme
|
||
<select class="theme-selector" oninput="activateTheme(this.value)">
|
||
<option value="auto" selected>Auto</option>
|
||
<option value="light">Light</option>
|
||
<option value="dark">Dark</option>
|
||
</select>
|
||
</label>
|
||
<div>
|
||
<h4>Previous topic</h4>
|
||
<p class="topless"><a href="arg.html"
|
||
title="previous chapter">Parsing arguments and building values</a></p>
|
||
</div>
|
||
<div>
|
||
<h4>Next topic</h4>
|
||
<p class="topless"><a href="reflection.html"
|
||
title="next chapter">Reflection</a></p>
|
||
</div>
|
||
<div role="note" aria-label="source link">
|
||
<h3>This Page</h3>
|
||
<ul class="this-page-menu">
|
||
<li><a href="../bugs.html">Report a Bug</a></li>
|
||
<li>
|
||
<a href="https://github.com/python/cpython/blob/main/Doc/c-api/conversion.rst"
|
||
rel="nofollow">Show Source
|
||
</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</nav>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
<div class="related" role="navigation" aria-label="related navigation">
|
||
<h3>Navigation</h3>
|
||
<ul>
|
||
<li class="right" style="margin-right: 10px">
|
||
<a href="../genindex.html" title="General Index"
|
||
accesskey="I">index</a></li>
|
||
<li class="right" >
|
||
<a href="../py-modindex.html" title="Python Module Index"
|
||
>modules</a> |</li>
|
||
<li class="right" >
|
||
<a href="reflection.html" title="Reflection"
|
||
accesskey="N">next</a> |</li>
|
||
<li class="right" >
|
||
<a href="arg.html" title="Parsing arguments and building values"
|
||
accesskey="P">previous</a> |</li>
|
||
|
||
<li><img src="../_static/py.svg" alt="python logo" style="vertical-align: middle; margin-top: -1px"/></li>
|
||
<li><a href="https://www.python.org/">Python</a> »</li>
|
||
<li class="switchers">
|
||
<div class="language_switcher_placeholder"></div>
|
||
<div class="version_switcher_placeholder"></div>
|
||
</li>
|
||
<li>
|
||
|
||
</li>
|
||
<li id="cpython-language-and-version">
|
||
<a href="../index.html">3.12.0 Documentation</a> »
|
||
</li>
|
||
|
||
<li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> »</li>
|
||
<li class="nav-item nav-item-2"><a href="utilities.html" accesskey="U">Utilities</a> »</li>
|
||
<li class="nav-item nav-item-this"><a href="">String conversion and formatting</a></li>
|
||
<li class="right">
|
||
|
||
|
||
<div class="inline-search" role="search">
|
||
<form class="inline-search" action="../search.html" method="get">
|
||
<input placeholder="Quick search" aria-label="Quick search" type="search" name="q" />
|
||
<input type="submit" value="Go" />
|
||
</form>
|
||
</div>
|
||
|
|
||
</li>
|
||
<li class="right">
|
||
<label class="theme-selector-label">
|
||
Theme
|
||
<select class="theme-selector" oninput="activateTheme(this.value)">
|
||
<option value="auto" selected>Auto</option>
|
||
<option value="light">Light</option>
|
||
<option value="dark">Dark</option>
|
||
</select>
|
||
</label> |</li>
|
||
|
||
</ul>
|
||
</div>
|
||
|
||
<div class="document">
|
||
<div class="documentwrapper">
|
||
<div class="bodywrapper">
|
||
<div class="body" role="main">
|
||
|
||
<section id="string-conversion-and-formatting">
|
||
<span id="string-conversion"></span><h1>String conversion and formatting<a class="headerlink" href="#string-conversion-and-formatting" title="Permalink to this headline">¶</a></h1>
|
||
<p>Functions for number conversion and formatted string output.</p>
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.PyOS_snprintf">
|
||
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyOS_snprintf</span></span></span><span class="sig-paren">(</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">str</span></span>, <span class="n"><span class="pre">size_t</span></span><span class="w"> </span><span class="n"><span class="pre">size</span></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">format</span></span>, <span class="p"><span class="pre">...</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyOS_snprintf" title="Permalink to this definition">¶</a><br /></dt>
|
||
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Output not more than <em>size</em> bytes to <em>str</em> according to the format string
|
||
<em>format</em> and the extra arguments. See the Unix man page <em class="manpage"><a class="manpage reference external" href="https://manpages.debian.org/snprintf(3)">snprintf(3)</a></em>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.PyOS_vsnprintf">
|
||
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyOS_vsnprintf</span></span></span><span class="sig-paren">(</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">str</span></span>, <span class="n"><span class="pre">size_t</span></span><span class="w"> </span><span class="n"><span class="pre">size</span></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">format</span></span>, <span class="n"><span class="pre">va_list</span></span><span class="w"> </span><span class="n"><span class="pre">va</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyOS_vsnprintf" title="Permalink to this definition">¶</a><br /></dt>
|
||
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Output not more than <em>size</em> bytes to <em>str</em> according to the format string
|
||
<em>format</em> and the variable argument list <em>va</em>. Unix man page
|
||
<em class="manpage"><a class="manpage reference external" href="https://manpages.debian.org/vsnprintf(3)">vsnprintf(3)</a></em>.</p>
|
||
</dd></dl>
|
||
|
||
<p><a class="reference internal" href="#c.PyOS_snprintf" title="PyOS_snprintf"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyOS_snprintf()</span></code></a> and <a class="reference internal" href="#c.PyOS_vsnprintf" title="PyOS_vsnprintf"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyOS_vsnprintf()</span></code></a> wrap the Standard C library
|
||
functions <code class="xref c c-func docutils literal notranslate"><span class="pre">snprintf()</span></code> and <code class="xref c c-func docutils literal notranslate"><span class="pre">vsnprintf()</span></code>. Their purpose is to
|
||
guarantee consistent behavior in corner cases, which the Standard C functions do
|
||
not.</p>
|
||
<p>The wrappers ensure that <code class="docutils literal notranslate"><span class="pre">str[size-1]</span></code> is always <code class="docutils literal notranslate"><span class="pre">'\0'</span></code> upon return. They
|
||
never write more than <em>size</em> bytes (including the trailing <code class="docutils literal notranslate"><span class="pre">'\0'</span></code>) into str.
|
||
Both functions require that <code class="docutils literal notranslate"><span class="pre">str</span> <span class="pre">!=</span> <span class="pre">NULL</span></code>, <code class="docutils literal notranslate"><span class="pre">size</span> <span class="pre">></span> <span class="pre">0</span></code>, <code class="docutils literal notranslate"><span class="pre">format</span> <span class="pre">!=</span> <span class="pre">NULL</span></code>
|
||
and <code class="docutils literal notranslate"><span class="pre">size</span> <span class="pre"><</span> <span class="pre">INT_MAX</span></code>. Note that this means there is no equivalent to the C99
|
||
<code class="docutils literal notranslate"><span class="pre">n</span> <span class="pre">=</span> <span class="pre">snprintf(NULL,</span> <span class="pre">0,</span> <span class="pre">...)</span></code> which would determine the necessary buffer size.</p>
|
||
<p>The return value (<em>rv</em>) for these functions should be interpreted as follows:</p>
|
||
<ul class="simple">
|
||
<li><p>When <code class="docutils literal notranslate"><span class="pre">0</span> <span class="pre"><=</span> <span class="pre">rv</span> <span class="pre"><</span> <span class="pre">size</span></code>, the output conversion was successful and <em>rv</em>
|
||
characters were written to <em>str</em> (excluding the trailing <code class="docutils literal notranslate"><span class="pre">'\0'</span></code> byte at
|
||
<code class="docutils literal notranslate"><span class="pre">str[rv]</span></code>).</p></li>
|
||
<li><p>When <code class="docutils literal notranslate"><span class="pre">rv</span> <span class="pre">>=</span> <span class="pre">size</span></code>, the output conversion was truncated and a buffer with
|
||
<code class="docutils literal notranslate"><span class="pre">rv</span> <span class="pre">+</span> <span class="pre">1</span></code> bytes would have been needed to succeed. <code class="docutils literal notranslate"><span class="pre">str[size-1]</span></code> is <code class="docutils literal notranslate"><span class="pre">'\0'</span></code>
|
||
in this case.</p></li>
|
||
<li><p>When <code class="docutils literal notranslate"><span class="pre">rv</span> <span class="pre"><</span> <span class="pre">0</span></code>, “something bad happened.” <code class="docutils literal notranslate"><span class="pre">str[size-1]</span></code> is <code class="docutils literal notranslate"><span class="pre">'\0'</span></code> in
|
||
this case too, but the rest of <em>str</em> is undefined. The exact cause of the error
|
||
depends on the underlying platform.</p></li>
|
||
</ul>
|
||
<p>The following functions provide locale-independent string to number conversions.</p>
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.PyOS_string_to_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">PyOS_string_to_double</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">s</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="p"><span class="pre">*</span></span><span class="n"><span class="pre">endptr</span></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">overflow_exception</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyOS_string_to_double" title="Permalink to this definition">¶</a><br /></dt>
|
||
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Convert a string <code class="docutils literal notranslate"><span class="pre">s</span></code> to a <span class="c-expr sig sig-inline c"><span class="kt">double</span></span>, raising a Python
|
||
exception on failure. The set of accepted strings corresponds to
|
||
the set of strings accepted by Python’s <a class="reference internal" href="../library/functions.html#float" title="float"><code class="xref py py-func docutils literal notranslate"><span class="pre">float()</span></code></a> constructor,
|
||
except that <code class="docutils literal notranslate"><span class="pre">s</span></code> must not have leading or trailing whitespace.
|
||
The conversion is independent of the current locale.</p>
|
||
<p>If <code class="docutils literal notranslate"><span class="pre">endptr</span></code> is <code class="docutils literal notranslate"><span class="pre">NULL</span></code>, convert the whole string. Raise
|
||
<a class="reference internal" href="../library/exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> and return <code class="docutils literal notranslate"><span class="pre">-1.0</span></code> if the string is not a valid
|
||
representation of a floating-point number.</p>
|
||
<p>If endptr is not <code class="docutils literal notranslate"><span class="pre">NULL</span></code>, convert as much of the string as
|
||
possible and set <code class="docutils literal notranslate"><span class="pre">*endptr</span></code> to point to the first unconverted
|
||
character. If no initial segment of the string is the valid
|
||
representation of a floating-point number, set <code class="docutils literal notranslate"><span class="pre">*endptr</span></code> to point
|
||
to the beginning of the string, raise ValueError, and return
|
||
<code class="docutils literal notranslate"><span class="pre">-1.0</span></code>.</p>
|
||
<p>If <code class="docutils literal notranslate"><span class="pre">s</span></code> represents a value that is too large to store in a float
|
||
(for example, <code class="docutils literal notranslate"><span class="pre">"1e500"</span></code> is such a string on many platforms) then
|
||
if <code class="docutils literal notranslate"><span class="pre">overflow_exception</span></code> is <code class="docutils literal notranslate"><span class="pre">NULL</span></code> return <code class="docutils literal notranslate"><span class="pre">Py_HUGE_VAL</span></code> (with
|
||
an appropriate sign) and don’t set any exception. Otherwise,
|
||
<code class="docutils literal notranslate"><span class="pre">overflow_exception</span></code> must point to a Python exception object;
|
||
raise that exception and return <code class="docutils literal notranslate"><span class="pre">-1.0</span></code>. In both cases, set
|
||
<code class="docutils literal notranslate"><span class="pre">*endptr</span></code> to point to the first character after the converted value.</p>
|
||
<p>If any other error occurs during the conversion (for example an
|
||
out-of-memory error), set the appropriate Python exception and
|
||
return <code class="docutils literal notranslate"><span class="pre">-1.0</span></code>.</p>
|
||
<div class="versionadded">
|
||
<p><span class="versionmodified added">New in version 3.1.</span></p>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.PyOS_double_to_string">
|
||
<span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyOS_double_to_string</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">val</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="n"><span class="pre">format_code</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">precision</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">flags</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">ptype</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyOS_double_to_string" title="Permalink to this definition">¶</a><br /></dt>
|
||
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Convert a <span class="c-expr sig sig-inline c"><span class="kt">double</span></span> <em>val</em> to a string using supplied
|
||
<em>format_code</em>, <em>precision</em>, and <em>flags</em>.</p>
|
||
<p><em>format_code</em> must be one of <code class="docutils literal notranslate"><span class="pre">'e'</span></code>, <code class="docutils literal notranslate"><span class="pre">'E'</span></code>, <code class="docutils literal notranslate"><span class="pre">'f'</span></code>, <code class="docutils literal notranslate"><span class="pre">'F'</span></code>,
|
||
<code class="docutils literal notranslate"><span class="pre">'g'</span></code>, <code class="docutils literal notranslate"><span class="pre">'G'</span></code> or <code class="docutils literal notranslate"><span class="pre">'r'</span></code>. For <code class="docutils literal notranslate"><span class="pre">'r'</span></code>, the supplied <em>precision</em>
|
||
must be 0 and is ignored. The <code class="docutils literal notranslate"><span class="pre">'r'</span></code> format code specifies the
|
||
standard <a class="reference internal" href="../library/functions.html#repr" title="repr"><code class="xref py py-func docutils literal notranslate"><span class="pre">repr()</span></code></a> format.</p>
|
||
<p><em>flags</em> can be zero or more of the values <code class="docutils literal notranslate"><span class="pre">Py_DTSF_SIGN</span></code>,
|
||
<code class="docutils literal notranslate"><span class="pre">Py_DTSF_ADD_DOT_0</span></code>, or <code class="docutils literal notranslate"><span class="pre">Py_DTSF_ALT</span></code>, or-ed together:</p>
|
||
<ul class="simple">
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">Py_DTSF_SIGN</span></code> means to always precede the returned string with a sign
|
||
character, even if <em>val</em> is non-negative.</p></li>
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">Py_DTSF_ADD_DOT_0</span></code> means to ensure that the returned string will not look
|
||
like an integer.</p></li>
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">Py_DTSF_ALT</span></code> means to apply “alternate” formatting rules. See the
|
||
documentation for the <a class="reference internal" href="#c.PyOS_snprintf" title="PyOS_snprintf"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyOS_snprintf()</span></code></a> <code class="docutils literal notranslate"><span class="pre">'#'</span></code> specifier for
|
||
details.</p></li>
|
||
</ul>
|
||
<p>If <em>ptype</em> is non-<code class="docutils literal notranslate"><span class="pre">NULL</span></code>, then the value it points to will be set to one of
|
||
<code class="docutils literal notranslate"><span class="pre">Py_DTST_FINITE</span></code>, <code class="docutils literal notranslate"><span class="pre">Py_DTST_INFINITE</span></code>, or <code class="docutils literal notranslate"><span class="pre">Py_DTST_NAN</span></code>, signifying that
|
||
<em>val</em> is a finite number, an infinite number, or not a number, respectively.</p>
|
||
<p>The return value is a pointer to <em>buffer</em> with the converted string or
|
||
<code class="docutils literal notranslate"><span class="pre">NULL</span></code> if the conversion failed. The caller is responsible for freeing the
|
||
returned string by calling <a class="reference internal" href="memory.html#c.PyMem_Free" title="PyMem_Free"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyMem_Free()</span></code></a>.</p>
|
||
<div class="versionadded">
|
||
<p><span class="versionmodified added">New in version 3.1.</span></p>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.PyOS_stricmp">
|
||
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyOS_stricmp</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">s1</span></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">s2</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyOS_stricmp" title="Permalink to this definition">¶</a><br /></dt>
|
||
<dd><p>Case insensitive comparison of strings. The function works almost
|
||
identically to <code class="xref c c-func docutils literal notranslate"><span class="pre">strcmp()</span></code> except that it ignores the case.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.PyOS_strnicmp">
|
||
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyOS_strnicmp</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">s1</span></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">s2</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">size</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyOS_strnicmp" title="Permalink to this definition">¶</a><br /></dt>
|
||
<dd><p>Case insensitive comparison of strings. The function works almost
|
||
identically to <code class="xref c c-func docutils literal notranslate"><span class="pre">strncmp()</span></code> except that it ignores the case.</p>
|
||
</dd></dl>
|
||
|
||
</section>
|
||
|
||
|
||
<div class="clearer"></div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
|
||
<div class="sphinxsidebarwrapper">
|
||
<div>
|
||
<h4>Previous topic</h4>
|
||
<p class="topless"><a href="arg.html"
|
||
title="previous chapter">Parsing arguments and building values</a></p>
|
||
</div>
|
||
<div>
|
||
<h4>Next topic</h4>
|
||
<p class="topless"><a href="reflection.html"
|
||
title="next chapter">Reflection</a></p>
|
||
</div>
|
||
<div role="note" aria-label="source link">
|
||
<h3>This Page</h3>
|
||
<ul class="this-page-menu">
|
||
<li><a href="../bugs.html">Report a Bug</a></li>
|
||
<li>
|
||
<a href="https://github.com/python/cpython/blob/main/Doc/c-api/conversion.rst"
|
||
rel="nofollow">Show Source
|
||
</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="clearer"></div>
|
||
</div>
|
||
<div class="related" role="navigation" aria-label="related navigation">
|
||
<h3>Navigation</h3>
|
||
<ul>
|
||
<li class="right" style="margin-right: 10px">
|
||
<a href="../genindex.html" title="General Index"
|
||
>index</a></li>
|
||
<li class="right" >
|
||
<a href="../py-modindex.html" title="Python Module Index"
|
||
>modules</a> |</li>
|
||
<li class="right" >
|
||
<a href="reflection.html" title="Reflection"
|
||
>next</a> |</li>
|
||
<li class="right" >
|
||
<a href="arg.html" title="Parsing arguments and building values"
|
||
>previous</a> |</li>
|
||
|
||
<li><img src="../_static/py.svg" alt="python logo" style="vertical-align: middle; margin-top: -1px"/></li>
|
||
<li><a href="https://www.python.org/">Python</a> »</li>
|
||
<li class="switchers">
|
||
<div class="language_switcher_placeholder"></div>
|
||
<div class="version_switcher_placeholder"></div>
|
||
</li>
|
||
<li>
|
||
|
||
</li>
|
||
<li id="cpython-language-and-version">
|
||
<a href="../index.html">3.12.0 Documentation</a> »
|
||
</li>
|
||
|
||
<li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> »</li>
|
||
<li class="nav-item nav-item-2"><a href="utilities.html" >Utilities</a> »</li>
|
||
<li class="nav-item nav-item-this"><a href="">String conversion and formatting</a></li>
|
||
<li class="right">
|
||
|
||
|
||
<div class="inline-search" role="search">
|
||
<form class="inline-search" action="../search.html" method="get">
|
||
<input placeholder="Quick search" aria-label="Quick search" type="search" name="q" />
|
||
<input type="submit" value="Go" />
|
||
</form>
|
||
</div>
|
||
|
|
||
</li>
|
||
<li class="right">
|
||
<label class="theme-selector-label">
|
||
Theme
|
||
<select class="theme-selector" oninput="activateTheme(this.value)">
|
||
<option value="auto" selected>Auto</option>
|
||
<option value="light">Light</option>
|
||
<option value="dark">Dark</option>
|
||
</select>
|
||
</label> |</li>
|
||
|
||
</ul>
|
||
</div>
|
||
<div class="footer">
|
||
© <a href="../copyright.html">Copyright</a> 2001-2023, Python Software Foundation.
|
||
<br />
|
||
This page is licensed under the Python Software Foundation License Version 2.
|
||
<br />
|
||
Examples, recipes, and other code in the documentation are additionally licensed under the Zero Clause BSD License.
|
||
<br />
|
||
See <a href="/license.html">History and License</a> for more information.<br />
|
||
<br />
|
||
|
||
The Python Software Foundation is a non-profit corporation.
|
||
<a href="https://www.python.org/psf/donations/">Please donate.</a>
|
||
<br />
|
||
<br />
|
||
|
||
Last updated on Oct 02, 2023.
|
||
<a href="/bugs.html">Found a bug</a>?
|
||
<br />
|
||
|
||
Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 4.5.0.
|
||
</div>
|
||
|
||
</body>
|
||
</html> |