I know this is looking back a month or two, but I have just started to use 
your idea about subclassing.

However, it is having unintended side effects.

Including the code:

class exp(sympy.exp):
    @classmethod
    def eval(cls, arg):
        return

in a module like noevals.py, and then subsequently importing noevals has 
disabled eval in the regular sympy.exp. I am super new to subclassing in 
general, but I know it's this code because when I delete these 4 lines the 
problem goes away. How do I retain this subclass without altering the 
parent's behaviour?

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