For example,
class A:
def __init__(self,a):
self.a = a
def __eq__(self, other):
return self.a == other.a
class B:
def __init__(self,b):
self.b = b
def __eq__(self, other):
return self.b == other.b
A(1) == B(1)
---> AttributeError: B instance has no attribute a
B(1) == A(1)
---> AttributeError: A instance has no attribute b
From the above, it seems that Python always uses the function defined
by the class on the LEFT. However, I don't understand the following then:
A(1) == 3
---> AttributeError: 'int' object has no attribute a
3 == A(1)
---> AttributeError: 'int' object has no attribute a
Can someone explain this? I expected 3 == A(1) to use the __eq__
function defined for 'int' objects.
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