6.7 Identity Operators

Identity Operators

message_1 = "hello"
message_2 = "hello"

print(message_1 is message_2)  # True
print(message_1 is not message_2)  # False

message_3 = "world"
message_4 = "tahiti"

print(message_3 is message_4)  # False
print(message_3 is not message_4)  # True

# primitive values, if duplicated, are stored
# in the same location
x = 5
y = 5
if x is y:
	print("x is y")
else:
	print("x is not y")

# lists are objects, so they are located
# in different locations in memory
a = [1, 2, 3]
b = [1, 2, 3]

# use the identity operator to test if the 2 variables
# reference the same location in memory
if a is b:
	print("a is b")
else:
	print("a is no b")

# use the equality operator to test if the content
# is equivalent
if a == b:
	print("a == b")
else:
	print("a != b")

x is y
a is not b
a == b