I recently updated from sympy 0.7.4 (I tihnk) to 0.7.6 and now I have some
very strange behaviour with subs. The following code
from sympy.abc import phi
import sympy as sp
z=sp.Symbol('z')
t=sp.Symbol('t')
sp.pprint((phi(z,t).diff(t,2)).subs(phi(z,t).diff(z),sp.Symbol('b')(z,t)).expand())
gives me the output
2
∂
───(b(z, t))
2
∂t
but I would expect the output
2
∂
───(φ(z, t))
2
∂t
This was working perfectly in my previous version of sympy.
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