Nested-if statement in Python

There come situations in real life when we need to make some decisions and based on these decisions, we decide what should we do next. Similar situations arise in programming also where we need to make some decisions and based on these decisions we will execute the next block of code. This is done with the help of decision-making statements in Python.

Example:

filter_none

edit
close

play_arrow

link
brightness_4
code

# Python program to demonstrate
# decision making
  
i = 20
if (i < 15): 
    print ("i is smaller than 15"
    print ("i'm in if Block"
else
    print ("i is greater than 15"
    print ("i'm in else Block"
print ("i'm not in if and not in else Block"

chevron_right


Output:

i is greater than 15
i'm in else Block
i'm not in if and not in else Block

Nested-if Statement

We can have an if…elif…else statement inside another if…elif…else statement. This is called nesting in computer programming. Any number of these statements can be nested inside one another. Indentation is the only way to figure out the level of nesting. This can get confusing, so it must be avoided if we can.

Syntax:



if (condition1):
   # Executes when condition1 is true
   if (condition2): 
      # Executes when condition2 is true
   # if Block is end here
# if Block is end here

FlowChart

nested-if1

Example 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

# Python program to demonstrate
# nested if statement
  
   
num = 15
if num >= 0:
    if num == 0:
        print("Zero")
    else:
        print("Positive number")
else:
    print("Negative number")

chevron_right


Output:

Positive number

Example 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

# Python program to demonstrate
# nested if statement
  
  
i = 13
  
if (i == 13): 
    #  First if statement 
    if (i < 15): 
        print ("i is smaller than 15"
          
    # Nested - if statement 
    # Will only be executed if statement above 
    # it is true 
    if (i < 12): 
        print ("i is smaller than 12 too"
    else
        print ("i is greater than 12 and smaller than 15")

chevron_right


Output:

i is smaller than 15
i is greater than 12 and smaller than 15



My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.


Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.