Until yesterday the recommended way to use the Dummy class was with Symbol('x',
dummy=True). While I agree that the new syntax is better, we should take a
more cautious approach in removing the old syntax. According to git blame, it
has been described in the user guide since 2008 and Dummy was not even in the
sympy namespace before yesterday. I don't think I am the only one with broken
scripts today.
These patches replace the removal with a deprecation warning, and also update
the user guide.
https://github.com/sympy/sympy/pull/118
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