sympy/sympy — pull request #1479 by scolobb (2012-08-11 10:39:33+00:00)
Title: Dict: Support creation from another Dict.

Previously ``Dict`` would complain whenever a ``Dict`` was supplied to the constructor, while it was quite OK with creating itself from a native Python dict. This commit makes it possible to do things like Dict(Dict{1: 2}).

This is a trivial change and we can do fine without it. Yet, the nonuniform treatment of native ``dict``'s and SymPy's ``Dict``'s may sometimes result in not-so-elegant code (my case right now).