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<div class="section" id="python">
<h1>Python<a class="headerlink" href="#python" title="Permalink to this headline">¶</a></h1>
<div class="section" id="what-is-python">
<span id="id1"></span><h2>What is Python?<a class="headerlink" href="#what-is-python" title="Permalink to this headline">¶</a></h2>
<p>From <a class="reference external" href="http://www.python.org">www.python.org</a>:</p>
<blockquote>
<div><p>Python is an <em>interpreted, interactive, object-oriented</em> programming
language. It is often compared to Tcl, Perl, Scheme or Java.</p>
<p>Python combines remarkable power with very clear syntax. It has modules,
classes, exceptions, very high level dynamic data types, and dynamic typing.
There are interfaces to many system calls and libraries, as well as to various
windowing systems (X11, Motif, Tk, Mac, MFC). New built-in modules are easily
written in C or C++. Python is also usable as an extension language for
applications that need a programmable interface.</p>
<p>The Python implementation is portable: it runs on many brands of UNIX, on
Windows, OS/2, Mac, Amiga, and many other platforms. If your favorite system
isn’t listed here, it may still be supported, if there’s a C compiler for it.
Ask around on <a class="reference external" href="news:comp.lang.python">comp.lang.python</a> – or just
try compiling Python yourself.</p>
<p>The Python implementation is <a class="reference external" href="http://www.python.org/doc/Copyright.html">copyrighted</a>
but <strong>freely usable and distributable, even for commercial use</strong>.</p>
</div></blockquote>
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<div class="section" id="where-can-i-learn-more-about-python">
<h2>Where can I learn more about Python?<a class="headerlink" href="#where-can-i-learn-more-about-python" title="Permalink to this headline">¶</a></h2>
<p>The place to start is <a class="reference external" href="http://www.python.org">www.python.org</a> where you will
find plenty of information on Python including tutorials.</p>
</div>
<div class="section" id="what-do-i-need-to-import-in-order-to-use-pyx">
<h2>What do I need to import in order to use PyX?<a class="headerlink" href="#what-do-i-need-to-import-in-order-to-use-pyx" title="Permalink to this headline">¶</a></h2>
<p>It is recommended to begin your Python code with:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">pyx</span> <span class="kn">import</span> <span class="o">*</span>
</pre></div>
</div>
<p>when using PyX. This allows you for example to write simply <code class="docutils literal"><span class="pre">graph.graphxy</span></code>
instead of <code class="docutils literal"><span class="pre">pyx.graph.graphxy</span></code>. The following modules will be loaded:
<code class="docutils literal"><span class="pre">attr</span></code>, <code class="docutils literal"><span class="pre">box</span></code>, <code class="docutils literal"><span class="pre">bitmap</span></code>, <code class="docutils literal"><span class="pre">canvas</span></code>, <code class="docutils literal"><span class="pre">color</span></code>, <code class="docutils literal"><span class="pre">connector</span></code>, <code class="docutils literal"><span class="pre">deco</span></code>,
<code class="docutils literal"><span class="pre">deformer</span></code>, <code class="docutils literal"><span class="pre">document</span></code>, <code class="docutils literal"><span class="pre">epsfile</span></code>, <code class="docutils literal"><span class="pre">graph</span></code>, <code class="docutils literal"><span class="pre">path</span></code>, <code class="docutils literal"><span class="pre">pattern</span></code>,
<code class="docutils literal"><span class="pre">style</span></code>, <code class="docutils literal"><span class="pre">trafo</span></code>, <code class="docutils literal"><span class="pre">text</span></code>, and <code class="docutils literal"><span class="pre">unit</span></code>.</p>
<p>For convenience, you might import specific objects of a module like in:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">graph</span> <span class="kn">import</span> <span class="n">graphxy</span>
</pre></div>
</div>
<p>which allows you to write <code class="docutils literal"><span class="pre">graphxy()</span></code> instead of <code class="docutils literal"><span class="pre">graph.graphxy()</span></code>.</p>
<p>All code segments in this document assume that the import line mentioned in the
first code snippet is present.</p>
</div>
<div class="section" id="what-is-a-raw-string-and-why-should-i-know-about-it-when-using-pyx">
<h2>What is a raw string and why should I know about it when using PyX?<a class="headerlink" href="#what-is-a-raw-string-and-why-should-i-know-about-it-when-using-pyx" title="Permalink to this headline">¶</a></h2>
<p>The backslash serves in standard Python strings to start an escape sequence.
For example <code class="docutils literal"><span class="pre">\n</span></code> corresponds to a newline character. On the other hand, TeX
and LaTeX, which do the typesetting in PyX, use the backslash to indicate the
start of a command. In order to avoid the standard interpretation, the string
should be marked as a raw string by prepending it by an <code class="docutils literal"><span class="pre">r</span></code> like in:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">c</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="s">r"$\alpha\beta\gamma$"</span><span class="p">)</span>
</pre></div>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Python</a><ul>
<li><a class="reference internal" href="#what-is-python">What is Python?</a></li>
<li><a class="reference internal" href="#where-can-i-learn-more-about-python">Where can I learn more about Python?</a></li>
<li><a class="reference internal" href="#what-do-i-need-to-import-in-order-to-use-pyx">What do I need to import in order to use PyX?</a></li>
<li><a class="reference internal" href="#what-is-a-raw-string-and-why-should-i-know-about-it-when-using-pyx">What is a raw string and why should I know about it when using PyX?</a></li>
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