If OR

Introduction:

  • Python supports the usual logical conditions from mathematics:
    • Equals: a == b
    • Not Equals: a != b
    • Less than: a < b
    • Less than or equal to: a <= b
    • Greater than: a > b
    • Greater than or equal to: a >= b

Combining Conditions with OR:

  • The or keyword is a logical operator used to combine conditional statements. It returns True if at least one of the conditions is true.

Example:

  • Test if a is greater than b, OR if a is greater than c:

    python
    a = 200
b = 33
c = 500
if a > b or a > c:
    print("At least one of the conditions is True")

Python If OR:

  • You can combine multiple conditions into a single expression in an If, If-Else, or Elif statement using the OR logical operator.

Examples:

  1. Python If with OR Operator in Condition:

    • Joining two simple boolean conditions to form a compound condition in a Python If statement.

      python
      today = 'Saturday'

if today == 'Sunday' or today == 'Saturday':
    print('Today is off. Rest at home.')
    • Output: Today is off. Rest at home.
       
  2. Python If-Else with OR Operator in Condition:

    • Combining two basic conditional expressions in a boolean expression in a Python If-Else statement.

      python
      today = 'Wednesday'

if today == 'Sunday' or today == 'Saturday':
    print('Today is off. Rest at home.')
else:
    print('Go to work.')
    • Output: Go to work.
       
  3. Python Elif with OR Operator in Condition:

    • Combining two basic conditional expressions in a boolean expression of a Python elif statement.

      python
      today = 'Sunday'

if today == 'Monday':
    print('Your weekend is over. Go to work.')
elif today == 'Sunday' or today == 'Saturday':
    print('Today is off.')
else:
    print('Go to work.')
    • Output: Today is off.
       

Exercises:

  1. If with OR Operator:

    • Write a program to check if a number is either less than 5 or greater than 10.

      python
      number = int(input("Enter a number: "))

if number < 5 or number > 10:
    print("The number is either less than 5 or greater than 10.")
else:
    print("The number is between 5 and 10.")
  2. If-Else with OR Operator:

    • Write a program to check if a user is eligible for a student discount (age less than 18 or has a student ID).

      python
      age = int(input("Enter age: "))
has_student_id = input("Do you have a student ID (yes/no): ").lower() == 'yes'

if age < 18 or has_student_id:
    print("You are eligible for a student discount.")
else:
    print("You are not eligible for a student discount.")

Summary:

  • In this tutorial, we learned how to use the Python OR logical operator in If, If-Else, and Elif conditional statements. Practice using these operators to become proficient in forming compound logical expressions in your programs