Python if elif else Statement decides to select only one block of statements from many given block of statements. It selects a block on the basis of the condition related to that block. It means that if elif else statement has many conditions and corresponding blocks of statements. If a given condition is true, if elif else statement will execute the corresponding block.
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Explain Python if elif else statement
Syntax of Python if elif else Statement
The general form of if elif else statement is as follows:
if condition-if: if-block elif condition-1: block-1 elif condition-2 block-2 . . . elif condition-n: block-n else: else-block
Working:
First of all, it evaluates the condition-if. If it is true, it executes the if-block. It ignores rest of the if elif else statement.
If condition-if is false, the control will test first elif condition. If this condition is true, it will execute first elif block called block-1.
Similarly, if first elif condition is false, the control will move to second elif condition and evaluates it. If it is true then block-2 is executed, and so on.
If if-condition is false and all elif conditions are also false, then the control will execute else-block.
Example of if elif else Statement
Write a Python script to assign a number to a variable num. Use if elif else statement to show corresponding day. 1 is for Monday, 2 is for Tuesday and so on. if the number assigned is other than 1 to 7, show a message of ‘Invalid input’.
num=5 if num==1: print('Monday'); elif num==2: print('Tuesday') elif num==3: print('Wednesday') elif num==4: print('Thursday') elif num==5: print('Friday') elif num==6: print('Saturday') elif num==7: print('Sunday') else: print('Invalid input, please enter 1 to 7 only') print('Learn Python, java on www.EasyCodeBook.com')
The output of the above Python code will be as follows:
Friday
This is because the num variable has the value 5. Therefore,
elif num==5: condition will be true and it will execute corresponding block-5 which is a print statement / function: print(‘Friday’). Therefore, it displays the message ‘Friday’ on the screen.
Moreover, the last statement which is not a part of if elif else statement, will also display one more message as follows:
Learn Python, java on www.EasyCodeBook.com
if elif else Statement Example Program Find Grade
# Write a Python program # using if-elif-else to print # the grade based on # score input by the user # Perfect Python Programming Tutorials # Author : www.EasyCodebook.com (c) # Actual Program starts here # Python Program - Print Your Grade using if-elif-else score = int(input("Enter score: ")) if score >= 80: grade = 'A' elif score >= 70: grade = 'B' elif score >= 55: grade = 'C' elif score >= 50: grade = 'Pass' else: grade = 'Fail' print ("\nGrade is: " + grade)