Indentation in Python
Indentation in Python refers to the spaces (or tabs) at the beginning of a line of code. Unlike many other programming languages, indentation in Python is not just for readability — it is a part of the syntax.
Indentation Defines Code Blocks
Python uses indentation to group statements together.
- In other languages (C, Java), { } are used
- In Python, indentation replaces { }
if age >= 18:
print("You are eligible to vote")
print("Please carry your ID")
Both print statements belong to the if block because they are indented.
Without Indentation, Code Will Not Run
Wrong:
if age >= 18:
print("Eligible")
Correct:
if age >= 18: print("Eligible")Used in All Control Structures
def greet(): print("Hello") print("Welcome to Python")Both lines are part of the function because of indentation.
Logical Errors Can Occur Due to Wrong Indentation.
Wrong Logic:
if marks >= 40: print("Pass") print("Exam Finished")"Exam Finished" runs always, not conditionally.
- Indentation is mandatory in Python
- It defines code blocks
- Replaces { } used in other languages
- Improves readability and program structure
- Incorrect indentation causes IndentationError
- Standard indentation is 4 spaces