Program:
# Membership Test for Dictionary Keys
squares = {1: 1, 3: 9, 5: 25, 7: 49, 9: 81}
print(1 in squares)
print(2 not in squares)
# membership tests for key only not value
print(49 in squares)
squares = {1: 1, 3: 9, 5: 25, 7: 49, 9: 81}
print(1 in squares)
print(2 not in squares)
# membership tests for key only not value
print(49 in squares)
Output:
True
True
False
True
False