Hello!
I have an application where I use undefined functions as keys in
dictionaries.
This works great out of the box for sympy.Function
However, I want to set real=True so I created a class factory which
overrides _eval_is_real
Now the trouble starts. I tried to work my way through the jungle of
metaclasses and the assumptions systems
but I don't seem to be able to fix this:
-*- coding: utf-8 -*-
from sympy.core.function import UndefinedFunction
import sympy
def MaybeRealFunction(key, real=None):
class _Function(UndefinedFunction):
@staticmethod
def _eval_is_real(self):
return real
return _Function(key)
def main():
x = sympy.Symbol('x')
assert x == sympy.Symbol('x')
f_x = sympy.Function('f')(x)
assert f_x == sympy.Function('f')(x)
g_x = MaybeRealFunction('g', real=True)(x)
assert g_x.is_real
assert g_x == g_x
assert g_x == MaybeRealFunction('g', real=True)(x) # <--- This one fails
if __name__ == '__main__':
main()
Any ideas?
Best regards,
/Björn
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