Python Operators: Comparison(Relational) and Logical Operators

Comparison(Relational) operators:

• Comparison operators are used to perform the comparison of the operands data. 

• It either returns True or False according to the condition.

Example1: int values

x = 10

y = 12

print('x > y  is: ',x>y)

print('x < y  is: ',x<y)

print('x == y is: ',x==y)

print('x != y is: ',x!=y)

print('x >= y is: ',x>=y)

print('x <= y is: ',x<=y)

Output:

x > y  is:  False

x < y  is:  True

x == y is:  False

x != y is:  True

x >= y is:  False

x <= y is:  True

Example2: Float values

x=1.0

y=1.2

print('x > y  is: ',x>y)

print('x < y  is: ',x<y)

print('x == y is: ',x==y)

print('x != y is: ',x!=y)

print('x >= y is: ',x>=y)

print('x <= y is: ',x<=y)

Output:

x > y  is:  False

x < y  is:  True

x == y is:  False

x != y is:  True

x >= y is:  False

x <= y is:  True

Example3: Bool values

x=True

y=False

print('x > y  is: ',x>y)

print('x < y  is: ',x<y)

print('x == y is: ',x==y)

print('x != y is: ',x!=y)

print('x >= y is: ',x>=y)

print('x <= y is: ',x<=y)

Output:

x > y  is:  True

x < y  is:  False

x == y is:  False

x != y is:  True

x >= y is:  True

x <= y is:  False

Example4.1: Complex values

x=3+4j

y=4+3j

print('x > y  is: ',x>y)

print('x < y  is: ',x<y)

Output:

Traceback (most recent call last):

  File "E:/python_practice/examples/relational.py", line 30, in <module>

    print('x > y  is: ',x>y)

TypeError: unorderable types: complex() > complex()

Example4.2: Complex values

x=3+4j

y=4+3j

print('x == y is: ',x==y)

print('x != y is: ',x!=y)

Output:

x == y is:  False

x != y is:  True

Example4.3: Complex values

x=3+4j

y=4+3j

print('x >= y is: ',x>=y)

print('x <= y is: ',x<=y)

Output:

Traceback (most recent call last):

  File "E:/python_practice/examples/relational.py", line 30, in <module>

    print('x >= y is: ',x>=y)

TypeError: unorderable types: complex() >= complex()

Logical Operators:

• Logical operators are used to perform the mathematical logical operators.

• Logical operators can be applied on Boolean type operands.

• Logical and: both operands are True,the result will be True,otherwise return False.

                           Example:

                                                    print(True and True)

                                    print(True and False)

                                    print(False and False)

                                    print(False and True)

                        Output:

                                                   True

                                    False

                                    False

                                    False

• Logical or: any one operand is True or both operands are True,the result will be True, otherwise return False.

                            Example:

                                                       print(True or True)

                                      print(True or False)

                                      print(False or False)

                                      print(False or True)

                          Output:

                                                      True

                                     True

                                     False

                                     True

• Logical not: if operand is True,the result will be False.if operand is False,the result will be True.

                                 Example:

                                                                print(not True)

                                            print(not False)

                                 Output:

                                                        False

                                           True

Example1:

x = True

y = False

print('x and y is: ',x and y)

print('x or y is: ',x or y)

print('not x is: ',not x)

Output:

x and y is:  False

x or y is:  True

not x is:  False

Example2:

print(1 and True)

print(1 and 1)

print(1 and 0)

print(1 and False)

Output:

True

1

0

False

Note:

• Here Python interpreter take 1 as True and 0 as False value