pt</b>(m, b)
    Return the x intercept of the line y=m*x+b.  The x intercept of a
    line is the point at which it crosses the x axis (y=0).</code>
</pre></div>

<p> For more information about Python docstrings, see the <a
href="http://www.python.org/doc/current/tut/node6.html#SECTION006750000000000000000">Python
Tutorial</a> or the Oreilly Network article <a
href="http://www.onlamp.com/lpt/a/python/2001/05/17/docstrings.html">Python
Documentation Tips and Tricks</a>. </p>

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