sympy/sympy — pull request #1065 by scolobb (2012-02-16 23:36:03+00:00)
Title: Extend SymPyDeprecationWarning with additional information. (Issue 2142)

SymPyDeprecationWarning now offers convenient facilities for specifying the deprecated feature, the version in which the feature is expected to be removed and what the user should use instead of the deprecated feature.