Last updated: Sep 29, 2023

Compare Two Objects For Equality in Python

The "==" operator

The == operator is used to compare two objects for equality in Python.

Example of comparing two strings in Python:

x = "Technology"
y = "Technology"
if x == y:
    print("Is Equal")
else:
    print("Not Equal")

The output of the above code is as follows:

Is Equal

Example of comparing two Numbers in Python:

x = 20
y = 40
if x == y:
    print("Is Equal")
else:
    print("Not Equal")

The output of the above code is as follows:

Not Equal

Example of comparing two Booleans in Python:

x = True
if x == True:
    print("Is True")
else:
    print("Is False")

The output of the above code is as follows:

Is True

The Python "is" Keyword

The "is" keyword is used to compare if two objects are same.

Here's an example to check if two objects are same:

a = "apple"
b = "apple"
print(a is b)

The output of the above code is as follows:

False

Another example:

list1 = [1,2,3,4]
list2 = [1,2,3,4]

result =  list1 is list2
print(result)

The output of the above code is as follows:

False

The Python __eq__

The __eq__ method is used to compare two class instances.

Example:

class Customer:
    def __init__(self, name, id):
        self.name = name
        self.id = id

    def __eq__(self, other):
        if (isinstance(other, Customer)):
            return self.name == other.name and self.id == other.id
        else:
            return False

object1 = Customer("Danny", 1)
object2 = Customer("Danny", 1)
x = object1 == object2
print(x)

The output of the above code is as follows:

True