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<div class="section" id="picking-an-interpreter">
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<h1>Picking an Interpreter<a class="headerlink" href="#picking-an-interpreter" title="Permalink to this headline">¶</a></h1>
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<p>Which Python to use?</p>
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<div class="section" id="x-vs-3-x">
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<h2>2.x vs 3.x<a class="headerlink" href="#x-vs-3-x" title="Permalink to this headline">¶</a></h2>
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<p><strong>tl;dr</strong>: Python 2.x is the status quo, Python 3.x is the shiny new thing.</p>
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<p><a class="reference external" href="http://wiki.python.org/moin/Python2orPython3">Further Reading</a></p>
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<div class="section" id="today">
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<h3>Today<a class="headerlink" href="#today" title="Permalink to this headline">¶</a></h3>
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<p>If you’re choosing a Python interpreter to use, I <em>highly</em> recommend you Use Python 2.7.x, unless you have a strong reason not to.</p>
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</div>
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<div class="section" id="the-future">
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<h3>The Future<a class="headerlink" href="#the-future" title="Permalink to this headline">¶</a></h3>
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<p>As more and more modules get ported over to Python3, the easier it will be for
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others to use it.</p>
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</div>
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</div>
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<div class="section" id="which-python-to-support">
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<h2>Which Python to Support?<a class="headerlink" href="#which-python-to-support" title="Permalink to this headline">¶</a></h2>
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<p>If you’re starting work on a new Python module, I recommend you write it for
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Python 2.5 or 2.6, and add support for Python3 in a later iteration.</p>
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</div>
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<div class="section" id="implementations">
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<h2>Implementations<a class="headerlink" href="#implementations" title="Permalink to this headline">¶</a></h2>
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<p>There are several popular implementations of the Python programming language on
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different back-ends.</p>
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<div class="section" id="cpython">
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<h3>CPython<a class="headerlink" href="#cpython" title="Permalink to this headline">¶</a></h3>
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<p><a class="reference external" href="http://www.python.org">CPython</a> is the reference implementation of Python,
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written in C. It compiles Python code to intermediate bytecode which is then
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interpreted by a virtual machine. When people speak of <em>Python</em> they often mean
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not just the language but also this implementation. It provides the highest
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level of compatibility with Python packages and C extension modules.</p>
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<p>If you are writing open-source Python code and want to reach the widest possible
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audience, targeting CPython is your best bet. If you need to use any packages
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that are rely on C extensions for their functionality (eg: numpy) then CPython
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is your only choice.</p>
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<p>Being the reference implementation, all versions of the Python language are
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available as CPython. Python 3 is only available in a CPython implementation.</p>
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</div>
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<div class="section" id="pypy">
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<h3>PyPy<a class="headerlink" href="#pypy" title="Permalink to this headline">¶</a></h3>
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<p><a class="reference external" href="http://pypy.org/">PyPy</a> is a Python interpreter implemented in a restricted
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statically-typed subset of the Python language called RPython. The interpreter
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features a just-in-time compiler and supports multiple back-ends (C, CLI, JVM).</p>
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<p>PyPy aims for maximum compatibility with the reference CPython implementation
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while improving performance.</p>
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<p>If you are looking to squeeze more performance out of your Python code, it’s
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worth giving PyPy a try.</p>
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<p>Currently PyPy supports Python 2.7.</p>
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</div>
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<div class="section" id="jython">
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<h3>Jython<a class="headerlink" href="#jython" title="Permalink to this headline">¶</a></h3>
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<p><a class="reference external" href="http://www.jython.org/">Jython</a> is a Python implementation that compiles
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Python code to Java byte code that then executes on a JVM. It has the additional
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advantage of being able to import and use any Java class the same as a Python
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module.</p>
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<p>If you need to interface with an existing Java codebase or have other reasons to
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need to write Python code for the JVM, Jython is the best choice.</p>
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<p>Currently Jython supports up to Python 2.5.</p>
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</div>
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<div class="section" id="ironpython">
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<h3>IronPython<a class="headerlink" href="#ironpython" title="Permalink to this headline">¶</a></h3>
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<p><a class="reference external" href="http://ironpython.net/">IronPython</a> is an implementation of Python for .NET
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framework. It can use both Python and .NET framework libraries, and can also
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expose Python code to other .NET languages.</p>
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<p><a class="reference external" href="http://ironpython.net/tools/">Python Tools for Visual Studio</a> integrate
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IronPython directly in to the Visual Studio development environment, making it
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an ideal choice for Windows developers.</p>
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<p>IronPython supports Python 2.7.</p>
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<div class="sphinxsidebarwrapper"><h3><a href="http://python-guide.org">About This Guide</a></h3>
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<p>
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This opinionated guide exists to provide both novice and expert Python developers a best-practice handbook to the installation, configuration, and usage of Python on a daily basis.
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</p>
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<h3><a href="../index.html">Table Of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">Picking an Interpreter</a><ul>
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<li><a class="reference internal" href="#x-vs-3-x">2.x vs 3.x</a><ul>
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<li><a class="reference internal" href="#today">Today</a></li>
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<li><a class="reference internal" href="#the-future">The Future</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#which-python-to-support">Which Python to Support?</a></li>
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<li><a class="reference internal" href="#implementations">Implementations</a><ul>
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<li><a class="reference internal" href="#cpython">CPython</a></li>
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<li><a class="reference internal" href="#pypy">PyPy</a></li>
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<li><a class="reference internal" href="#jython">Jython</a></li>
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<li><a class="reference internal" href="#ironpython">IronPython</a></li>
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<h3>Related Topics</h3>
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<li><a href="../index.html">Documentation overview</a><ul>
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<li>Previous: <a href="../intro/news.html" title="previous chapter">News</a></li>
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<li>Next: <a href="installation.html" title="next chapter">Properly Installing Python</a></li>
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© Copyright 2011. A <a href="http://kennethreitz.com/pages/open-projects.html">Kenneth Reitz</a> Project.
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