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Python Booleans, Comparison and Logical Operators

Video link: https://youtu.be/mrryXQnlYN8

In this video, we learned about the boolean data type as well as comparison and logical operators in Python.

Programs in the Video

Boolean Data Type

Boolean is a logical data type that represents one of two values: either True or False.

result1 = True
result2 = False

print(result1) # True
print(result2) # False

Comparison Operators

Python has a set of comparison operators that allow us to compare two values. If the comparison is right, we get True and if the comparison is wrong, we get False.

number = 5
print(number < 10) # True

number = 15
print(number < 10) # False

Here's a list of comparison operators:

Comparison Operators:

<          Less than
>          Greater than
==         Equal   
!=         Not equal
>=         Greater than or equal to
<=         Less than or equal to

Examples: Comparison Operators

# comparison operators in action

number = 15
print(number > 10) # True

number = 10
print(number > 10) # False

number = 10
# equal to
print(number == 10) # True

number = 10.0
# comparing float and integer
print(number == 10) # True

number = '10'
# comparing string and integer
print(number == 10) # False

number = '10'
# not equal to
print(number != 10) # True

number = 10
# less than or equal to
print(number <= 10) # True

number = 10
# greater than or equal to
print(number >= 10) # True

Logical Operators

Python also has three logical operators that operate on the boolean values. Here's a list of the logical operators:

Logical Operators

and         True if both operands are True
or          True if either of the operands is True
not         True if the operand is False

and Operator

If both of the expressions are True, then the result is True.

age = 22
gpa = 3.8

result = age >= 18 and gpa > 3.6
print(result) # True

However, if either of these expressions is False, the result is False.

age = 22
gpa = 3.8

print(age >= 18 and gpa > 3.9) # false

or Operator

If either of the expression is True, then the result is True. If both expressions are False, only then the result is False.

age = 22
gpa = 3.8

print(age >= 18 or gpa > 3.9)

not Operator

The not operator gives the complement of the result:

  • If True, result is False.
  • If False, result is True.
result = True
print(result) # True

result = True
print(not result) # False

Programming Task

Can you guess the output of this program?

language = "Python"
print("1.", language == "python")

age = 18
print("2.", age >= 18)
print("3.", age > 18)

print("4.", age >= 18 and language == "Java")

Output

1. False
2. True
3. False
4. False