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<div class="section" id="python-2-4-compatibiity">
<h1>Python 2.4 Compatibiity<a class="headerlink" href="#python-2-4-compatibiity" title="Permalink to this headline">¶</a></h1>
<div class="section" id="module-kitchen.pycompat24.sets">
<span id="sets-for-python-2-3"></span><h2>Sets for python-2.3<a class="headerlink" href="#module-kitchen.pycompat24.sets" title="Permalink to this headline">¶</a></h2>
<p>In python-2.4, a builtin <a class="reference external" href="http://docs.python.org/library/stdtypes.html#set" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">set</span></tt></a> type was added to python. This module
provides a function to emulate that on python-2.3 by using the <a class="reference external" href="http://docs.python.org/library/sets.html#sets" title="(in Python v2.7)"><tt class="xref py py-mod docutils literal"><span class="pre">sets</span></tt></a>
module.</p>
<dl class="docutils">
<dt><tt class="xref py py-func docutils literal"><span class="pre">set()</span></tt></dt>
<dd>Create a set. If running on python 2.4+ this is the <a class="reference external" href="http://docs.python.org/library/stdtypes.html#set" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">set</span></tt></a>
constructor. If using python-2.3, it’s <a class="reference external" href="http://docs.python.org/library/sets.html#sets.Set" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">sets.Set</span></tt></a>.</dd>
<dt><tt class="xref py py-func docutils literal"><span class="pre">frozenset()</span></tt></dt>
<dd>Create a frozenset. If running on python2.4+ this is the
<a class="reference external" href="http://docs.python.org/library/stdtypes.html#frozenset" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">frozenset</span></tt></a> constructor. If using python-2.3, it’s
<a class="reference external" href="http://docs.python.org/library/sets.html#sets.ImmutableSet" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">sets.ImmutableSet</span></tt></a>.</dd>
</dl>
<p class="versionchanged">
<span class="versionmodified">Changed in version 0.2.0: </span>API: kitchen.pycompat24 1.0.0
Added set and frozenset</p>
<dl class="function">
<dt id="kitchen.pycompat24.sets.add_builtin_set">
<tt class="descclassname">kitchen.pycompat24.sets.</tt><tt class="descname">add_builtin_set</tt><big>(</big><big>)</big><a class="headerlink" href="#kitchen.pycompat24.sets.add_builtin_set" title="Permalink to this definition">¶</a></dt>
<dd><p>If there’s no set builtin, us the <a class="reference external" href="http://docs.python.org/library/sets.html#sets" title="(in Python v2.7)"><tt class="xref py py-mod docutils literal"><span class="pre">sets</span></tt></a> module to make one</p>
<p>This function makes sure that a <a class="reference external" href="http://docs.python.org/library/stdtypes.html#set" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">set</span></tt></a> and <a class="reference external" href="http://docs.python.org/library/stdtypes.html#frozenset" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">frozenset</span></tt></a> type
are available in the <a class="reference external" href="http://docs.python.org/library/__builtin__.html#__builtin__" title="(in Python v2.7)"><tt class="xref py py-mod docutils literal"><span class="pre">__builtin__</span></tt></a> namespace. Since the function
checks whether <a class="reference external" href="http://docs.python.org/library/stdtypes.html#set" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">set</span></tt></a> and <a class="reference external" href="http://docs.python.org/library/stdtypes.html#frozenset" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">frozenset</span></tt></a> are already present in
the <a class="reference external" href="http://docs.python.org/library/__builtin__.html#__builtin__" title="(in Python v2.7)"><tt class="xref py py-mod docutils literal"><span class="pre">__builtin__</span></tt></a> namespace and refuses to overwrite those if found,
it’s safe to call this in multiple places and in scripts run under
python-2.4+, where a more efficient set implementation is already present
in the <a class="reference external" href="http://docs.python.org/library/__builtin__.html#__builtin__" title="(in Python v2.7)"><tt class="xref py py-mod docutils literal"><span class="pre">__builtin__</span></tt></a> namespace.</p>
<p>However, since this function modifies <a class="reference external" href="http://docs.python.org/library/__builtin__.html#__builtin__" title="(in Python v2.7)"><tt class="xref py py-mod docutils literal"><span class="pre">__builtin__</span></tt></a> there’s no need
to call it more than once so you likely want to do something like this
when your program loads:</p>
<div class="highlight-python"><pre>myprogram/__init__.py:
from kitchen.pycompat24 import sets
builtinset.add_builtin_set()</pre>
</div>
<p>You can then use <tt class="xref py py-func docutils literal"><span class="pre">set()</span></tt> and <tt class="xref py py-func docutils literal"><span class="pre">frozenset()</span></tt> anywhere in your code:</p>
<div class="highlight-python"><pre>myprogram/compute.py:
def math_students(algebra_student_list, geometry_student_list):
return set(algebra_student_list) union set(geometry_student_list)</pre>
</div>
</dd></dl>
</div>
<div class="section" id="module-kitchen.pycompat24.base64">
<span id="partial-new-style-base64-interface"></span><h2>Partial new style base64 interface<a class="headerlink" href="#module-kitchen.pycompat24.base64" title="Permalink to this headline">¶</a></h2>
<p>Implement the modern base64 interface.</p>
<p>Python-2.4 and above have a new API for the base64 module. This is a backport
of that module for use on python-2.3.</p>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><a class="reference external" href="http://docs.python.org/library/base64.html#base64" title="(in Python v2.7)"><tt class="xref py py-mod docutils literal"><span class="pre">base64</span></tt></a>
for information about using the functions provided here.</p>
</div>
<dl class="function">
<dt id="kitchen.pycompat24.base64.b16decode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">b16decode</tt><big>(</big><em>s</em>, <em>casefold=False</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.b16decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Decode a Base16 encoded string.</p>
<p>s is the string to decode. Optional casefold is a flag specifying whether
a lowercase alphabet is acceptable as input. For security purposes, the
default is False.</p>
<p>The decoded string is returned. A TypeError is raised if s were
incorrectly padded or if there are non-alphabet characters present in the
string.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.b16encode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">b16encode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.b16encode" title="Permalink to this definition">¶</a></dt>
<dd><p>Encode a string using Base16.</p>
<p>s is the string to encode. The encoded string is returned.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.b32decode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">b32decode</tt><big>(</big><em>s</em>, <em>casefold=False</em>, <em>map01=None</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.b32decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Decode a Base32 encoded string.</p>
<p>s is the string to decode. Optional casefold is a flag specifying whether
a lowercase alphabet is acceptable as input. For security purposes, the
default is False.</p>
<p>RFC 3548 allows for optional mapping of the digit 0 (zero) to the letter O
(oh), and for optional mapping of the digit 1 (one) to either the letter I
(eye) or letter L (el). The optional argument map01 when not None,
specifies which letter the digit 1 should be mapped to (when map01 is not
None, the digit 0 is always mapped to the letter O). For security
purposes the default is None, so that 0 and 1 are not allowed in the
input.</p>
<p>The decoded string is returned. A TypeError is raised if s were
incorrectly padded or if there are non-alphabet characters present in the
string.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.b32encode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">b32encode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.b32encode" title="Permalink to this definition">¶</a></dt>
<dd><p>Encode a string using Base32.</p>
<p>s is the string to encode. The encoded string is returned.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.b64decode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">b64decode</tt><big>(</big><em>s</em>, <em>altchars=None</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.b64decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Decode a Base64 encoded string.</p>
<p>s is the string to decode. Optional altchars must be a string of at least
length 2 (additional characters are ignored) which specifies the
alternative alphabet used instead of the ‘+’ and ‘/’ characters.</p>
<p>The decoded string is returned. A TypeError is raised if s were
incorrectly padded or if there are non-alphabet characters present in the
string.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.b64encode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">b64encode</tt><big>(</big><em>s</em>, <em>altchars=None</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.b64encode" title="Permalink to this definition">¶</a></dt>
<dd><p>Encode a string using Base64.</p>
<p>s is the string to encode. Optional altchars must be a string of at least
length 2 (additional characters are ignored) which specifies an
alternative alphabet for the ‘+’ and ‘/’ characters. This allows an
application to e.g. generate url or filesystem safe Base64 strings.</p>
<p>The encoded string is returned.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.decode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">decode</tt><big>(</big><em>input</em>, <em>output</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Decode a file.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.decodestring">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">decodestring</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.decodestring" title="Permalink to this definition">¶</a></dt>
<dd><p>Decode a string.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.encode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">encode</tt><big>(</big><em>input</em>, <em>output</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.encode" title="Permalink to this definition">¶</a></dt>
<dd><p>Encode a file.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.encodestring">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">encodestring</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.encodestring" title="Permalink to this definition">¶</a></dt>
<dd><p>Encode a string into multiple lines of base-64 data.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.standard_b64decode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">standard_b64decode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.standard_b64decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Decode a string encoded with the standard Base64 alphabet.</p>
<p>s is the string to decode. The decoded string is returned. A TypeError
is raised if the string is incorrectly padded or if there are non-alphabet
characters present in the string.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.standard_b64encode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">standard_b64encode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.standard_b64encode" title="Permalink to this definition">¶</a></dt>
<dd><p>Encode a string using the standard Base64 alphabet.</p>
<p>s is the string to encode. The encoded string is returned.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.urlsafe_b64decode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">urlsafe_b64decode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.urlsafe_b64decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Decode a string encoded with the standard Base64 alphabet.</p>
<p>s is the string to decode. The decoded string is returned. A TypeError
is raised if the string is incorrectly padded or if there are non-alphabet
characters present in the string.</p>
<p>The alphabet uses ‘-‘ instead of ‘+’ and ‘_’ instead of ‘/’.</p>
</dd></dl>
<dl class="function">
<dt id="kitchen.pycompat24.base64.urlsafe_b64encode">
<tt class="descclassname">kitchen.pycompat24.base64.</tt><tt class="descname">urlsafe_b64encode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#kitchen.pycompat24.base64.urlsafe_b64encode" title="Permalink to this definition">¶</a></dt>
<dd><p>Encode a string using a url-safe Base64 alphabet.</p>
<p>s is the string to encode. The encoded string is returned. The alphabet
uses ‘-‘ instead of ‘+’ and ‘_’ instead of ‘/’.</p>
</dd></dl>
</div>
<div class="section" id="subprocess">
<h2>Subprocess<a class="headerlink" href="#subprocess" title="Permalink to this headline">¶</a></h2>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt><a class="reference internal" href="api-pycompat27.html#module-kitchen.pycompat27.subprocess" title="kitchen.pycompat27.subprocess"><tt class="xref py py-mod docutils literal"><span class="pre">kitchen.pycompat27.subprocess</span></tt></a></dt>
<dd>Kitchen includes the python-2.7 version of subprocess which has a new
function, <tt class="xref py py-func docutils literal"><span class="pre">check_output()</span></tt>. When
you import <tt class="xref py py-mod docutils literal"><span class="pre">pycompat24.subprocess</span></tt> you will be getting the
python-2.7 version of subprocess rather than the 2.4 version (where
subprocess first appeared). This choice was made so that we can
concentrate our efforts on keeping the single version of subprocess up
to date rather than working on a 2.4 version that very few people
would need specifically.</dd>
</dl>
</div>
</div>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Python 2.4 Compatibiity</a><ul>
<li><a class="reference internal" href="#module-kitchen.pycompat24.sets">Sets for python-2.3</a></li>
<li><a class="reference internal" href="#module-kitchen.pycompat24.base64">Partial new style base64 interface</a></li>
<li><a class="reference internal" href="#subprocess">Subprocess</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="api-versioning.html"
title="previous chapter">Helpers for versioning software</a></p>
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title="next chapter">Python 2.5 Compatibility</a></p>
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