Checking membership in python list trouble -


i encountered problem item membership in list, can't understand. while checking object instance in list( simple "item in list" ) returns me false if instance in list. notice same pointers have no same id.

do have use special method or what? can helps me compare instance equality, please.

note: occasion happens in pyside if matters.

your objects need have __eq__ method define how compare objects equality.

in [18]: class a(object):     ...:     def __init__(self, n):     ...:         self.n = n     ...:      in [19]: class b(object):     ...:     def __init__(self, n):     ...:         self.n = n     ...:     def __eq__(self, other):     ...:         return self.n == other     ...:       in [20]: = a(1)   in [21]: b = b(1)  in [22]: in [a(n) n in range(10)] out[22]: false  in [23]: b in [b(n) n in range(10)] out[23]: true  in [24]: b in [b(n) n in range(10, 20)] out[24]: false

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