How to Fix IndentationError in Python

Indentation is very important in Python because it tells the interpreter which lines of code belong together. If the indentation is incorrect, Python will raise an IndentationError. This error can be confusing for beginners, but it’s easy to fix once you understand what causes it.

An IndentationError happens when the spaces or tabs at the beginning of a line are not consistent or when a block of code is not properly indented. Python uses indentation to group statements into blocks like loops, functions, and conditionals. If the indentation level does not match what Python expects, it will raise this error.

def greet():
print("Hello, world!")  # This line causes IndentationError

greet()

In the example above, the line that prints "Hello, world!" should be indented to show that it is inside the function greet(). To fix the IndentationError, add four spaces (or a tab, but be consistent) before the print statement:

def greet():
    print("Hello, world!")  # Correct indentation

greet()

Remember to use the same type of indentation (spaces or tabs) consistently throughout your code. Most Python style guides recommend using 4 spaces per indentation level. Proper indentation helps keep your code organized and avoids IndentationErrors.