Creating hashtable in Python 3 for my class

You need to implement the .__hash__() method as well as the .__eq__() method.

The method should return an integer, and for any two objects where .__eq__() returns True, .__hash__() must return the same integer value.

The easiest way to accomplish this is to use the built-in hash() function on each and every attribute of your instance that makes it unique, and return the XORed result of those values.

Example:

class Foo(object):
    def __init__(self, bar, baz):
        self.bar = bar
        self.baz = baz

    def __eq__(self, other):
        if isinstance(other, type(self)):
            return self.bar == other.bar and self.baz == other.baz
        return False

    def __hash__(self):
        return hash(self.bar) ^ hash(self.baz)

Demo:

>>> foo1 = Foo('ham', 'eggs')
>>> foo2 = Foo('ham', 'eggs')
>>> foo3 = Foo('spam', 'vikings')
>>> foo1 == foo2
True
>>> foo1 == foo3
False
>>> hash(foo1)
1838536788654183919
>>> hash(foo1) == hash(foo2)
True
>>> hash(foo1) == hash(foo3)
False
>>> mapping = {}
>>> mapping[foo1] = 'Monty Python'
>>> foo1 in mapping
True
>>> foo2 in mapping
True
>>> foo3 in mapping
False
>>> mapping[foo2]
'Monty Python'