How do you compare "foo == None" with ==?

It's strange to compare the integer as is. I thought while looking at , is compares id() based on what?

Basic types such as integers can just compare values, but I wonder how to compare objects.

2022-09-22 14:52

1 Answers

== returns true/false with the __eq__() method. __eq__() is included in existing types or user-defined classes Override is also possible.

class foo(object):
    def__eq__(self, other): #In this class, instances always return true no matter what they compare
        return True

    def __init__(self):
        self.a = 5
        self.b = 4

class bar(object):
    def__eq__(self, other): #In this class, instances always return false no matter what they compare
        return False

myfoo1 = foo()
myfoo2 = foo()
mybar1 = bar()

print("myfoo1 == myfoo2:\t", myfoo1 == myfoo2)
print("myfoo1 == 3:\t\t", myfoo1 == 3)
print("3 == myfoo1:\t\t", 3 == myfoo1)


print("myfoo1 == mybar1:\t", myfoo1 == mybar1)
print("mybar1 == myfoo1:\t", mybar1 == myfoo1)

Output:

myfoo1 == myfoo2:    True
myfoo1 == 3:         True
3 == myfoo1:         True
myfoo1 == mybar1:    True
mybar1 == myfoo1:    False

2022-09-22 14:52

If you have any answers or tips

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