Comment #20 on issue 1735 by ronan.l...@gmail.com: Rename .func attribute
(.args too?)
http://code.google.com/p/sympy/issues/detail?id=1735
The point is that we don't want that invariant if we want to resolve issue
1688 (and issue 2006, etc.) There's basically no way to allow sin to behave
as a full-fledged sympy object if it remains the type of expressions like
sin(x), but we still want sin(x).head == sin.
I don't see any reason to change 'args'. It is a descriptive name and it's
already used in built-in Python exceptions:
In [3]: e = ValueError("1", 2, 3.)
In [4]: e.args
Out[4]: (1, 2, 3.0)
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