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<div class="section" id="api-notes">
<h1>API Notes<a class="headerlink" href="#api-notes" title="Permalink to this headline">¶</a></h1>
<div class="section" id="pygraphviz-1-2">
<h2>pygraphviz-1.2<a class="headerlink" href="#pygraphviz-1-2" title="Permalink to this headline">¶</a></h2>
<blockquote>
<div>No API changes</div></blockquote>
</div>
<div class="section" id="pygraphviz-1-1">
<h2>pygraphviz-1.1<a class="headerlink" href="#pygraphviz-1-1" title="Permalink to this headline">¶</a></h2>
<blockquote>
<div><p>Pygraphviz-1.1 adds unicode (graphviz charset) support.
The default Node type is now unicode.
See examples/utf8.py for an example of how to use non-ASCII characters.</p>
<p>The __str__ and __repr__ methods have been rewritten and a __unicode__
method added.</p>
<p>If G is a pygraphviz.AGraph object then</p>
<ul class="simple">
<li>str(G) produces a dot-format string representation
(some characters might not be represented correctly)</li>
<li>unicode(G) produces a dot-format unicode representation</li>
<li>repr(G) produces a string of the unicode representation.</li>
<li>print G produces a formatted dot language output</li>
</ul>
</div></blockquote>
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<div class="section" id="pygraphivz-0-32">
<h2>pygraphivz-0.32<a class="headerlink" href="#pygraphivz-0-32" title="Permalink to this headline">¶</a></h2>
<blockquote>
<div><p>pygraphviz-0.32 is a rewrite of pygraphviz-0.2x with some significant
changes in the API and Graphviz wrapper. It is not compatible with
with earlier versions.</p>
<p>The goal of pygraphviz is to provide a (mostly) Pythonic interface
to the Graphviz Agraph data-structure, layout, and drawing algorithms.</p>
<p>The API is now similar to the NetworkX API. Studying the
documentation and Tutorial for NetworkX will teach you most of what
you need to know for pygraphviz. For a short introduction on pygraphviz
see the pygraphviz Tutorial.</p>
<p>There are some important differences between the PyGraphviz
and NetworkX API. With PyGraphviz</p>
<blockquote>
<div><ul class="simple">
<li>All nodes must be of string or unicode type.
An attempt will be made to convert other types to a string.</li>
<li>Nodes and edges are custom Python objects. Nodes are like
unicode/string objects and edges are like tuple objects. (In NetworkX
nodes can be anything and edges are two- or three-tuples.)</li>
<li>Graphs, edges, and nodes may have attributes such as color,
size, shape, attached to them. If the attributes are known
Graphviz attributes they will be used for drawing and layout.</li>
<li>The layout() and draw() methods allow positioning of nodes
and rendering in all of the supported Graphviz output formats.</li>
<li>The string() method produces a string with the graph represented
in Graphviz dot format. See also from_string().</li>
<li>The subgraph() method is the Graphviz representation of
subgraphs: a tree of graphs under the original
(root) graph. The are primarily used for clustering of nodes when
drawing with dot.</li>
</ul>
</div></blockquote>
<p>Pygraphviz supports most of the Graphviz API.</p>
</div></blockquote>
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