Does a Python object which doesn't override comparison operators equals itself?

Question

class A(object):

    def __init__(self, value):
        self.value = value

x = A(1)
y = A(2)

q = [x, y]
q.remove(y)

I want to remove from the li

Answer 1

In python, by default an object is always equal to itself (the only exception I can think of is float("nan"). An object of a user-defined class will not be equal to any other object unless you define a comparison function.

See also http://docs.python.org/reference/expressions.html#notin