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<section id="pending-removal-in-python-3-16">
<h1>Pending removal in Python 3.16<a class="headerlink" href="#pending-removal-in-python-3-16" title="Link to this heading"></a></h1>
<ul>
<li><p>The import system:</p>
<ul class="simple">
<li><p>Setting <a class="reference internal" href="../reference/datamodel.html#module.__loader__" title="module.__loader__"><code class="xref py py-attr docutils literal notranslate"><span class="pre">__loader__</span></code></a> on a module while
failing to set <a class="reference internal" href="../library/importlib.html#importlib.machinery.ModuleSpec.loader" title="importlib.machinery.ModuleSpec.loader"><code class="xref py py-attr docutils literal notranslate"><span class="pre">__spec__.loader</span></code></a>
is deprecated. In Python 3.16, <code class="xref py py-attr docutils literal notranslate"><span class="pre">__loader__</span></code> will cease to be set or
taken into consideration by the import system or the standard library.</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/array.html#module-array" title="array: Space efficient arrays of uniformly typed numeric values."><code class="xref py py-mod docutils literal notranslate"><span class="pre">array</span></code></a>:</p>
<ul class="simple">
<li><p>The <code class="docutils literal notranslate"><span class="pre">'u'</span></code> format code (<code class="xref c c-type docutils literal notranslate"><span class="pre">wchar_t</span></code>)
has been deprecated in documentation since Python 3.3
and at runtime since Python 3.13.
Use the <code class="docutils literal notranslate"><span class="pre">'w'</span></code> format code (<a class="reference internal" href="../c-api/unicode.html#c.Py_UCS4" title="Py_UCS4"><code class="xref c c-type docutils literal notranslate"><span class="pre">Py_UCS4</span></code></a>)
for Unicode characters instead.</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/asyncio.html#module-asyncio" title="asyncio: Asynchronous I/O."><code class="xref py py-mod docutils literal notranslate"><span class="pre">asyncio</span></code></a>:</p>
<ul>
<li><p><code class="xref py py-func docutils literal notranslate"><span class="pre">asyncio.iscoroutinefunction()</span></code> is deprecated
and will be removed in Python 3.16;
use <a class="reference internal" href="../library/inspect.html#inspect.iscoroutinefunction" title="inspect.iscoroutinefunction"><code class="xref py py-func docutils literal notranslate"><span class="pre">inspect.iscoroutinefunction()</span></code></a> instead.
(Contributed by Jiahao Li and Kumar Aditya in <a class="reference external" href="https://github.com/python/cpython/issues/122875">gh-122875</a>.)</p></li>
<li><p><a class="reference internal" href="../library/asyncio.html#module-asyncio" title="asyncio: Asynchronous I/O."><code class="xref py py-mod docutils literal notranslate"><span class="pre">asyncio</span></code></a> policy system is deprecated and will be removed in Python 3.16.
In particular, the following classes and functions are deprecated:</p>
<ul class="simple">
<li><p><a class="reference internal" href="../library/asyncio-policy.html#asyncio.AbstractEventLoopPolicy" title="asyncio.AbstractEventLoopPolicy"><code class="xref py py-class docutils literal notranslate"><span class="pre">asyncio.AbstractEventLoopPolicy</span></code></a></p></li>
<li><p><a class="reference internal" href="../library/asyncio-policy.html#asyncio.DefaultEventLoopPolicy" title="asyncio.DefaultEventLoopPolicy"><code class="xref py py-class docutils literal notranslate"><span class="pre">asyncio.DefaultEventLoopPolicy</span></code></a></p></li>
<li><p><a class="reference internal" href="../library/asyncio-policy.html#asyncio.WindowsSelectorEventLoopPolicy" title="asyncio.WindowsSelectorEventLoopPolicy"><code class="xref py py-class docutils literal notranslate"><span class="pre">asyncio.WindowsSelectorEventLoopPolicy</span></code></a></p></li>
<li><p><a class="reference internal" href="../library/asyncio-policy.html#asyncio.WindowsProactorEventLoopPolicy" title="asyncio.WindowsProactorEventLoopPolicy"><code class="xref py py-class docutils literal notranslate"><span class="pre">asyncio.WindowsProactorEventLoopPolicy</span></code></a></p></li>
<li><p><a class="reference internal" href="../library/asyncio-policy.html#asyncio.get_event_loop_policy" title="asyncio.get_event_loop_policy"><code class="xref py py-func docutils literal notranslate"><span class="pre">asyncio.get_event_loop_policy()</span></code></a></p></li>
<li><p><a class="reference internal" href="../library/asyncio-policy.html#asyncio.set_event_loop_policy" title="asyncio.set_event_loop_policy"><code class="xref py py-func docutils literal notranslate"><span class="pre">asyncio.set_event_loop_policy()</span></code></a></p></li>
</ul>
<p>Users should use <a class="reference internal" href="../library/asyncio-runner.html#asyncio.run" title="asyncio.run"><code class="xref py py-func docutils literal notranslate"><span class="pre">asyncio.run()</span></code></a> or <a class="reference internal" href="../library/asyncio-runner.html#asyncio.Runner" title="asyncio.Runner"><code class="xref py py-class docutils literal notranslate"><span class="pre">asyncio.Runner</span></code></a> with
<em>loop_factory</em> to use the desired event loop implementation.</p>
<p>For example, to use <a class="reference internal" href="../library/asyncio-eventloop.html#asyncio.SelectorEventLoop" title="asyncio.SelectorEventLoop"><code class="xref py py-class docutils literal notranslate"><span class="pre">asyncio.SelectorEventLoop</span></code></a> on Windows:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span><span class="w"> </span><span class="nn">asyncio</span>
<span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">main</span><span class="p">():</span>
<span class="o">...</span>
<span class="n">asyncio</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">main</span><span class="p">(),</span> <span class="n">loop_factory</span><span class="o">=</span><span class="n">asyncio</span><span class="o">.</span><span class="n">SelectorEventLoop</span><span class="p">)</span>
</pre></div>
</div>
<p>(Contributed by Kumar Aditya in <a class="reference external" href="https://github.com/python/cpython/issues/127949">gh-127949</a>.)</p>
</li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/builtins.html#module-builtins" title="builtins: The module that provides the built-in namespace."><code class="xref py py-mod docutils literal notranslate"><span class="pre">builtins</span></code></a>:</p>
<ul class="simple">
<li><p>Bitwise inversion on boolean types, <code class="docutils literal notranslate"><span class="pre">~True</span></code> or <code class="docutils literal notranslate"><span class="pre">~False</span></code>
has been deprecated since Python 3.12,
as it produces surprising and unintuitive results (<code class="docutils literal notranslate"><span class="pre">-2</span></code> and <code class="docutils literal notranslate"><span class="pre">-1</span></code>).
Use <code class="docutils literal notranslate"><span class="pre">not</span> <span class="pre">x</span></code> instead for the logical negation of a Boolean.
In the rare case that you need the bitwise inversion of
the underlying integer, convert to <code class="docutils literal notranslate"><span class="pre">int</span></code> explicitly (<code class="docutils literal notranslate"><span class="pre">~int(x)</span></code>).</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/functools.html#module-functools" title="functools: Higher-order functions and operations on callable objects."><code class="xref py py-mod docutils literal notranslate"><span class="pre">functools</span></code></a>:</p>
<ul class="simple">
<li><p>Calling the Python implementation of <a class="reference internal" href="../library/functools.html#functools.reduce" title="functools.reduce"><code class="xref py py-func docutils literal notranslate"><span class="pre">functools.reduce()</span></code></a> with <em>function</em>
or <em>sequence</em> as keyword arguments has been deprecated since Python 3.14.</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/logging.html#module-logging" title="logging: Flexible event logging system for applications."><code class="xref py py-mod docutils literal notranslate"><span class="pre">logging</span></code></a>:</p>
<ul class="simple">
<li><p>Support for custom logging handlers with the <em>strm</em> argument is deprecated
and scheduled for removal in Python 3.16. Define handlers with the <em>stream</em>
argument instead. (Contributed by Mariusz Felisiak in <a class="reference external" href="https://github.com/python/cpython/issues/115032">gh-115032</a>.)</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/mimetypes.html#module-mimetypes" title="mimetypes: Mapping of filename extensions to MIME types."><code class="xref py py-mod docutils literal notranslate"><span class="pre">mimetypes</span></code></a>:</p>
<ul class="simple">
<li><p>Valid extensions start with a ‘.’ or are empty for
<a class="reference internal" href="../library/mimetypes.html#mimetypes.MimeTypes.add_type" title="mimetypes.MimeTypes.add_type"><code class="xref py py-meth docutils literal notranslate"><span class="pre">mimetypes.MimeTypes.add_type()</span></code></a>.
Undotted extensions are deprecated and will
raise a <a class="reference internal" href="../builtins/exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> in Python 3.16.
(Contributed by Hugo van Kemenade in <a class="reference external" href="https://github.com/python/cpython/issues/75223">gh-75223</a>.)</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/shutil.html#module-shutil" title="shutil: High-level file operations, including copying."><code class="xref py py-mod docutils literal notranslate"><span class="pre">shutil</span></code></a>:</p>
<ul class="simple">
<li><p>The <code class="xref py py-class docutils literal notranslate"><span class="pre">ExecError</span></code> exception
has been deprecated since Python 3.14.
It has not been used by any function in <code class="xref py py-mod docutils literal notranslate"><span class="pre">shutil</span></code> since Python 3.4,
and is now an alias of <a class="reference internal" href="../builtins/exceptions.html#RuntimeError" title="RuntimeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">RuntimeError</span></code></a>.</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/symtable.html#module-symtable" title="symtable: Interface to the compiler's internal symbol tables."><code class="xref py py-mod docutils literal notranslate"><span class="pre">symtable</span></code></a>:</p>
<ul class="simple">
<li><p>The <a class="reference internal" href="../library/symtable.html#symtable.Class.get_methods" title="symtable.Class.get_methods"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Class.get_methods</span></code></a> method
has been deprecated since Python 3.14.</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/sys.html#module-sys" title="sys: Access system-specific parameters and functions."><code class="xref py py-mod docutils literal notranslate"><span class="pre">sys</span></code></a>:</p>
<ul class="simple">
<li><p>The <a class="reference internal" href="../library/sys.html#sys._enablelegacywindowsfsencoding" title="sys._enablelegacywindowsfsencoding"><code class="xref py py-func docutils literal notranslate"><span class="pre">_enablelegacywindowsfsencoding()</span></code></a> function
has been deprecated since Python 3.13.
Use the <span class="target" id="index-0"></span><a class="reference internal" href="../using/cmdline.html#envvar-PYTHONLEGACYWINDOWSFSENCODING"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PYTHONLEGACYWINDOWSFSENCODING</span></code></a> environment variable instead.</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/sysconfig.html#module-sysconfig" title="sysconfig: Python's configuration information"><code class="xref py py-mod docutils literal notranslate"><span class="pre">sysconfig</span></code></a>:</p>
<ul class="simple">
<li><p>The <code class="xref py py-func docutils literal notranslate"><span class="pre">sysconfig.expand_makefile_vars()</span></code> function
has been deprecated since Python 3.14.
Use the <code class="docutils literal notranslate"><span class="pre">vars</span></code> argument of <a class="reference internal" href="../library/sysconfig.html#sysconfig.get_paths" title="sysconfig.get_paths"><code class="xref py py-func docutils literal notranslate"><span class="pre">sysconfig.get_paths()</span></code></a> instead.</p></li>
</ul>
</li>
<li><p><a class="reference internal" href="../library/tarfile.html#module-tarfile" title="tarfile: Read and write tar-format archive files."><code class="xref py py-mod docutils literal notranslate"><span class="pre">tarfile</span></code></a>:</p>
<ul class="simple">
<li><p>The undocumented and unused <code class="xref py py-attr docutils literal notranslate"><span class="pre">TarFile.tarfile</span></code> attribute
has been deprecated since Python 3.13.</p></li>
</ul>
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