Indentation in Python

Last Updated : 03 Dec, 2024

In Python, indentation is used to define blocks of code. It tells the Python interpreter that a group of statements belongs to a specific block. All statements with the same level of indentation are considered part of the same block. Indentation is achieved using whitespace (spaces or tabs) at the beginning of each line.

For Example:

Python

if 10 > 5: print("This is true!") print("I am tab indentation") print("I have no indentation")

Output

This is true! I am tab indentation I have no indentation

The first two print statements are indented by 4 spaces, so they belong to the if block.
The third print statement is not indented, so it is outside the if block.

If we Skip Indentation, Python will throw error.

Python

if 10>5: print("GeeksforGeeks")

Write-Post-Improvement-12-03-2024_11_02_AM — Error

Indentation in Conditional Statements

The lines print(‘GeeksforGeeks…’) and print(‘retype the URL.’) are two separate code blocks. The two blocks of code in our example if-statement are both indented four spaces. The final print(‘All set!’) is not indented, so it does not belong to the else block.

Python

a = 20 if a >= 18: print('GeeksforGeeks...') else: print('retype the URL.') print('All set !')

Output

GeeksforGeeks... All set !

Indentation in Loops

To indicate a block of code in Python, we must indent each line of the block by the same whitespace. The two lines of code in the while loop are both indented four spaces. It is required for indicating what block of code a statement belongs to.

Python

j = 1 while(j<= 5): print(j) j = j + 1