Puzzled by FiPy's use of "=="

From	André Roberge <andre.roberge@gmail.com>
Newsgroups	comp.lang.python
Subject	Puzzled by FiPy's use of "=="
Date	2012-03-26 04:47 -0700
Organization	http://groups.google.com
Message-ID	<24963904.2261.1332762433787.JavaMail.geo-discussion-forums@vbbfw10> (permalink)

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In FiPy (a finite volume PDE solver), equations are "magically" set up as 

eqX = TransientTerm() == ExplicitDiffusionTerm(coeff=D)

and solved via

eqX.solve(...)

How can eqX be anything than True or False?...  This must be via a redefinition of "==" but I can't see how that is done.  I did look at many of the source files, thinking that it must be via a redefinition of "__eq__" somewhere but with no luck.   Any pointers would be appreciated.

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Puzzled by FiPy's use of "==" André Roberge <andre.roberge@gmail.com> - 2012-03-26 04:47 -0700
  Re: Puzzled by FiPy's use of "==" Robert Kern <robert.kern@gmail.com> - 2012-03-26 13:16 +0100
    Re: Puzzled by FiPy's use of "==" André Roberge <andre.roberge@gmail.com> - 2012-03-26 05:21 -0700
    Re: Puzzled by FiPy's use of "==" André Roberge <andre.roberge@gmail.com> - 2012-03-26 05:21 -0700

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