Hey!
Can someone confirm, that code below is valid and I am not abusing
anything? :)
#!/usr/bin/python
from sympy import *
F = Function('F')
x, y, t = symbols('x y t')
a = Symbol('a', Real=True)
eq = Derivative(F(x, t), x)
pat = -33*t*x + F(x + exp(-t))
sub = eq.subs(F(x, t), pat)
print "Fails after print?"
print sub
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