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<li class="toctree-l3"><a class="reference internal" href="3.9.html#notable-changes-in-python-3-9-1">Notable changes in Python 3.9.1</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="3.9.html#notable-changes-in-python-3-9-2">Notable changes in Python 3.9.2</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="3.8.html">What’s New In Python 3.8</a><ul>
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<li class="toctree-l4"><a class="reference internal" href="3.8.html#debug-build-uses-the-same-abi-as-release-build">Debug build uses the same ABI as release build</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.8.html#f-strings-support-for-self-documenting-expressions-and-debugging">f-strings support <code class="docutils literal notranslate"><span class="pre">=</span></code> for self-documenting expressions and debugging</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.8.html#pep-578-python-runtime-audit-hooks">PEP 578: Python Runtime Audit Hooks</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.8.html#pep-587-python-initialization-configuration">PEP 587: Python Initialization Configuration</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.8.html#pep-590-vectorcall-a-fast-calling-protocol-for-cpython">PEP 590: Vectorcall: a fast calling protocol for CPython</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.8.html#pickle-protocol-5-with-out-of-band-data-buffers">Pickle protocol 5 with out-of-band data buffers</a></li>
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<li class="toctree-l3"><a class="reference internal" href="3.8.html#notable-changes-in-python-3-8-8">Notable changes in Python 3.8.8</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.8.html#notable-changes-in-python-3-8-12">Notable changes in Python 3.8.12</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="3.7.html">What’s New In Python 3.7</a><ul>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#summary-release-highlights">Summary – Release Highlights</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#new-features">New Features</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-563-postponed-evaluation-of-annotations">PEP 563: Postponed Evaluation of Annotations</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-538-legacy-c-locale-coercion">PEP 538: Legacy C Locale Coercion</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-540-forced-utf-8-runtime-mode">PEP 540: Forced UTF-8 Runtime Mode</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-553-built-in-breakpoint">PEP 553: Built-in <code class="docutils literal notranslate"><span class="pre">breakpoint()</span></code></a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-539-new-c-api-for-thread-local-storage">PEP 539: New C API for Thread-Local Storage</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-562-customization-of-access-to-module-attributes">PEP 562: Customization of Access to Module Attributes</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-564-new-time-functions-with-nanosecond-resolution">PEP 564: New Time Functions With Nanosecond Resolution</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-565-show-deprecationwarning-in-main">PEP 565: Show DeprecationWarning in <code class="docutils literal notranslate"><span class="pre">__main__</span></code></a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-560-core-support-for-typing-module-and-generic-types">PEP 560: Core Support for <code class="docutils literal notranslate"><span class="pre">typing</span></code> module and Generic Types</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-552-hash-based-pyc-files">PEP 552: Hash-based .pyc Files</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#pep-545-python-documentation-translations">PEP 545: Python Documentation Translations</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#python-development-mode-x-dev">Python Development Mode (-X dev)</a></li>
</ul>
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<li class="toctree-l3"><a class="reference internal" href="3.7.html#other-language-changes">Other Language Changes</a></li>
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<li class="toctree-l3"><a class="reference internal" href="3.7.html#improved-modules">Improved Modules</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#argparse">argparse</a></li>
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<li class="toctree-l4"><a class="reference internal" href="3.7.html#binascii">binascii</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#calendar">calendar</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#collections">collections</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#compileall">compileall</a></li>
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<li class="toctree-l4"><a class="reference internal" href="3.7.html#dbm">dbm</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#decimal">decimal</a></li>
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<li class="toctree-l4"><a class="reference internal" href="3.7.html#enum">enum</a></li>
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<li class="toctree-l3"><a class="reference internal" href="3.7.html#deprecated-python-modules-functions-and-methods">Deprecated Python modules, functions and methods</a><ul>
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<li class="toctree-l4"><a class="reference internal" href="3.7.html#id6">importlib</a></li>
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<li class="toctree-l4"><a class="reference internal" href="3.7.html#id10">sys</a></li>
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<li class="toctree-l3"><a class="reference internal" href="3.7.html#deprecated-functions-and-types-of-the-c-api">Deprecated functions and types of the C API</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#platform-support-removals">Platform Support Removals</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#api-and-feature-removals">API and Feature Removals</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#module-removals">Module Removals</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#windows-only-changes">Windows-only Changes</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#porting-to-python-3-7">Porting to Python 3.7</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#changes-in-python-behavior">Changes in Python Behavior</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#changes-in-the-python-api">Changes in the Python API</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#changes-in-the-c-api">Changes in the C API</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#cpython-bytecode-changes">CPython bytecode changes</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#id12">Windows-only Changes</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.7.html#id13">Other CPython implementation changes</a></li>
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<li class="toctree-l3"><a class="reference internal" href="3.7.html#notable-changes-in-python-3-7-1">Notable changes in Python 3.7.1</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#notable-changes-in-python-3-7-2">Notable changes in Python 3.7.2</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#notable-changes-in-python-3-7-6">Notable changes in Python 3.7.6</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.7.html#notable-changes-in-python-3-7-10">Notable changes in Python 3.7.10</a></li>
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</li>
<li class="toctree-l2"><a class="reference internal" href="3.6.html">What’s New In Python 3.6</a><ul>
<li class="toctree-l3"><a class="reference internal" href="3.6.html#summary-release-highlights">Summary – Release highlights</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.6.html#new-features">New Features</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-498-formatted-string-literals">PEP 498: Formatted string literals</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-526-syntax-for-variable-annotations">PEP 526: Syntax for variable annotations</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-515-underscores-in-numeric-literals">PEP 515: Underscores in Numeric Literals</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-525-asynchronous-generators">PEP 525: Asynchronous Generators</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-530-asynchronous-comprehensions">PEP 530: Asynchronous Comprehensions</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-487-simpler-customization-of-class-creation">PEP 487: Simpler customization of class creation</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-487-descriptor-protocol-enhancements">PEP 487: Descriptor Protocol Enhancements</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-519-adding-a-file-system-path-protocol">PEP 519: Adding a file system path protocol</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-495-local-time-disambiguation">PEP 495: Local Time Disambiguation</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-529-change-windows-filesystem-encoding-to-utf-8">PEP 529: Change Windows filesystem encoding to UTF-8</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-528-change-windows-console-encoding-to-utf-8">PEP 528: Change Windows console encoding to UTF-8</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-520-preserving-class-attribute-definition-order">PEP 520: Preserving Class Attribute Definition Order</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-468-preserving-keyword-argument-order">PEP 468: Preserving Keyword Argument Order</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#new-dict-implementation">New <span class="xref std std-ref">dict</span> implementation</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pep-523-adding-a-frame-evaluation-api-to-cpython">PEP 523: Adding a frame evaluation API to CPython</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#pythonmalloc-environment-variable">PYTHONMALLOC environment variable</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#dtrace-and-systemtap-probing-support">DTrace and SystemTap probing support</a></li>
</ul>
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<li class="toctree-l3"><a class="reference internal" href="3.6.html#other-language-changes">Other Language Changes</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.6.html#new-modules">New Modules</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#secrets">secrets</a></li>
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<li class="toctree-l3"><a class="reference internal" href="3.6.html#improved-modules">Improved Modules</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#array">array</a></li>
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<li class="toctree-l4"><a class="reference internal" href="3.6.html#concurrent-futures">concurrent.futures</a></li>
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<li class="toctree-l5"><a class="reference internal" href="3.6.html#grp">grp</a></li>
<li class="toctree-l5"><a class="reference internal" href="3.6.html#id3">importlib</a></li>
<li class="toctree-l5"><a class="reference internal" href="3.6.html#id4">os</a></li>
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<li class="toctree-l5"><a class="reference internal" href="3.6.html#id6">ssl</a></li>
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<li class="toctree-l4"><a class="reference internal" href="3.6.html#deprecated-functions-and-types-of-the-c-api">Deprecated functions and types of the C API</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#deprecated-build-options">Deprecated Build Options</a></li>
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<li class="toctree-l4"><a class="reference internal" href="3.6.html#api-and-feature-removals">API and Feature Removals</a></li>
</ul>
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<li class="toctree-l3"><a class="reference internal" href="3.6.html#porting-to-python-3-6">Porting to Python 3.6</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#changes-in-python-command-behavior">Changes in ‘python’ Command Behavior</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#changes-in-the-python-api">Changes in the Python API</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#changes-in-the-c-api">Changes in the C API</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#cpython-bytecode-changes">CPython bytecode changes</a></li>
</ul>
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<li class="toctree-l3"><a class="reference internal" href="3.6.html#notable-changes-in-python-3-6-2">Notable changes in Python 3.6.2</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#new-make-regen-all-build-target">New <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">regen-all</span></code> build target</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.6.html#removal-of-make-touch-build-target">Removal of <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">touch</span></code> build target</a></li>
</ul>
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<li class="toctree-l3"><a class="reference internal" href="3.6.html#notable-changes-in-python-3-6-4">Notable changes in Python 3.6.4</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.6.html#notable-changes-in-python-3-6-5">Notable changes in Python 3.6.5</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.6.html#notable-changes-in-python-3-6-7">Notable changes in Python 3.6.7</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.6.html#notable-changes-in-python-3-6-10">Notable changes in Python 3.6.10</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.6.html#notable-changes-in-python-3-6-13">Notable changes in Python 3.6.13</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="3.5.html">What’s New In Python 3.5</a><ul>
<li class="toctree-l3"><a class="reference internal" href="3.5.html#summary-release-highlights">Summary – Release highlights</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.5.html#new-features">New Features</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-492-coroutines-with-async-and-await-syntax">PEP 492 - Coroutines with async and await syntax</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-465-a-dedicated-infix-operator-for-matrix-multiplication">PEP 465 - A dedicated infix operator for matrix multiplication</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-448-additional-unpacking-generalizations">PEP 448 - Additional Unpacking Generalizations</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-461-percent-formatting-support-for-bytes-and-bytearray">PEP 461 - percent formatting support for bytes and bytearray</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-484-type-hints">PEP 484 - Type Hints</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-471-os-scandir-function-a-better-and-faster-directory-iterator">PEP 471 - os.scandir() function – a better and faster directory iterator</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-475-retry-system-calls-failing-with-eintr">PEP 475: Retry system calls failing with EINTR</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-479-change-stopiteration-handling-inside-generators">PEP 479: Change StopIteration handling inside generators</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-485-a-function-for-testing-approximate-equality">PEP 485: A function for testing approximate equality</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-486-make-the-python-launcher-aware-of-virtual-environments">PEP 486: Make the Python Launcher aware of virtual environments</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-488-elimination-of-pyo-files">PEP 488: Elimination of PYO files</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#pep-489-multi-phase-extension-module-initialization">PEP 489: Multi-phase extension module initialization</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="3.5.html#other-language-changes">Other Language Changes</a></li>
<li class="toctree-l3"><a class="reference internal" href="3.5.html#new-modules">New Modules</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#typing">typing</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#zipapp">zipapp</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="3.5.html#improved-modules">Improved Modules</a><ul>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#argparse">argparse</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#asyncio">asyncio</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#bz2">bz2</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#cgi">cgi</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#cmath">cmath</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#code">code</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#collections">collections</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#collections-abc">collections.abc</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#compileall">compileall</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#concurrent-futures">concurrent.futures</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#configparser">configparser</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#contextlib">contextlib</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#csv">csv</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#curses">curses</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#dbm">dbm</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#difflib">difflib</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#distutils">distutils</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#doctest">doctest</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#email">email</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#enum">enum</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#faulthandler">faulthandler</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#functools">functools</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#glob">glob</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#gzip">gzip</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#heapq">heapq</a></li>
<li class="toctree-l4"><a class="reference internal" href="3.5.html#http">http</a></li>
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<li class="toctree-l2"><a class="reference internal" href="3.4.html">What’s New In Python 3.4</a><ul>
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