I'm using the subs method to replace certain parameters in an expression with values prior to solving the equation.
The following simple example works fine:
from sympy import Symbol
Q = Symbol("Q")
exp1 = Q 1
print(exp1.subs({'Q': 1})) # prints 2
However, if the symbol has an assumption such as real
or positive
specified this does not work:
Q = Symbol("Q", positive=True)
exp1 = Q 1
print(exp1.subs({'Q': 1})) # prints Q 1
Why is this and what am I doing wrong?
CodePudding user response:
Don't use a string key.
print(exp1.subs({Q: 1}))