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Kenneth Reitz
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<div class="section" id="properly-installing-python">
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<h1>Properly Installing Python<a class="headerlink" href="#properly-installing-python" title="Permalink to this headline">¶</a></h1>
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<p><em>Or, “Installing Python 2.7 via Homebrew”.</em></p>
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<p>One of the reasons everybody loves Python is the interactive shell. It
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basically allows you to execute Python commands in real time and
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immediately get results back. Flask itself does not come with an
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interactive shell, because it does not require any specific setup upfront,
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just import your application and start playing around.</p>
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<div class="section" id="package-manager">
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<h2>Package Manager<a class="headerlink" href="#package-manager" title="Permalink to this headline">¶</a></h2>
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<p>While Snow Leopard comes with a large number of UNIX utilities, those
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familiar with Linux systems will notice one key component missing: a
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package manager. Mxcl’s <em>Homebrew</em> is the answer.</p>
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<p>To install Homebrew, simply run:</p>
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<div class="highlight-python"><pre>$ ruby -e "$(curl -fsS http://gist.github.com/raw/323731/install_homebrew.rb)"</pre>
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</div>
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<p>It’s basic commands are <strong>update</strong>, <strong>install</strong>, and <strong>remove</strong>.</p>
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</div>
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<div class="section" id="python-interpreter">
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<h2>Python Interpreter<a class="headerlink" href="#python-interpreter" title="Permalink to this headline">¶</a></h2>
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<p>And we can now install Python 2.7:</p>
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<div class="highlight-python"><pre>$ sudo brew install python --framework</pre>
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</div>
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<p>The <tt class="docutils literal"><span class="pre">--framework</span></tt> option tells Homebrew to compile a Framework-style Python build, rather than a UNIX-style build. The outdated version of Python that Snow Leopard comes packaged with
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is built as a Framework, so this helps avoid some future module installation
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bugs.</p>
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<p><em>Don’t forget to update your environment PATH.</em></p>
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<div class="highlight-python"><pre>$ echo 'EXPORT PATH=/usr/local/Cellar/python2.7/bin:$PATH' >> .profile</pre>
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</div>
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<div class="section" id="distribute-pip">
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<h2>Distribute & Pip<a class="headerlink" href="#distribute-pip" title="Permalink to this headline">¶</a></h2>
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<p><em>Distribute</em> is a fantastic drop-in replacement for <em>easy_install</em> and
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<em>setuptools</em>. It allows you to install and manage python packages from
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pypi.python.org, amongst a few other sources. It also plays well with
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<em>virtualenv</em> and user-enviornments.</p>
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<p><strong>easy_install</strong> is considered by many to be a deprecated system, so we
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will install it’s replacement: <strong>pip</strong>. Pip allows for uninstallation
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of packages, and is actively maintained, unlike setuptool’s easy_install.</p>
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<p>To install <em>pip</em> and Distribute’s <em>easy_install</em>:</p>
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<p>If you have homebrew:</p>
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<div class="highlight-python"><pre>$ brew install pip</pre>
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</div>
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<p>...And, if you’re a masochist:</p>
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<div class="highlight-python"><pre>$ curl -O http://python-distribute.org/distribute_setup.py
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$ python distribute_setup.py
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$ easy_install pip</pre>
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</div>
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<p>To install <tt class="docutils literal"><span class="pre">pip</span></tt>:</p>
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<p>Hopefully you’ll never have to use <strong>easy_install</strong> again.</p>
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<h3><a href="index.html">Table Of Contents</a></h3>
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<li><a class="reference internal" href="#">Properly Installing Python</a><ul>
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<li><a class="reference internal" href="#package-manager">Package Manager</a></li>
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<li><a class="reference internal" href="#python-interpreter">Python Interpreter</a></li>
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<li><a class="reference internal" href="#distribute-pip">Distribute & Pip</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="index.html" title="previous chapter">Welcome to OSXPython.org</a></li>
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