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What if you replace

r = operator(*map(self, ex.operands()))

with

r = op(*map(self, ex.operands()))

operator is a module, here you might want to refer to the op parapeter of the method derivative.

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No.2 Revision

What if you replace

r = operator(*map(self, ex.operands()))

with

r = op(*map(self, ex.operands()))

operator is a module, here you might want to refer to the op parapeter parameter of the method derivative.