If, Elif, and Else

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Learning Objectives

  • Write conditional blocks with if
  • Chain conditions with elif
  • Provide fallback actions with else

The if Statement

An if statement runs a block of code only when its condition is True. Indentation matters in Python.

temperature = 85
if temperature > 80:
    print("It is hot outside!")
    print("Stay hydrated.")

if / elif / else

Use elif to check additional conditions, and else as a catch-all.

score = 78
if score >= 90:
    print("A")
elif score >= 80:
    print("B")
elif score >= 70:
    print("C")
else:
    print("D or F")

Course Example: True or False Quiz

A simple quiz that checks user input and responds accordingly.

answer = input("Return TRUE or FALSE: Python was released in 1991:\n")

if answer == "TRUE":
 print('Correct')
elif answer == "FALSE":
 print('Wrong')
elif answer != ("TRUE" or "FALSE"):
 print('Please answer TRUE or FALSE')
print('Bye!')

📝 Exercise: Number Classifier

Write a script that takes a number and prints whether it is positive, negative, or zero.

code.py
Output

            

        

    


    

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