Why Does Python Throw an 'IndentationError: unindent does not match any outer indentation level' Error?

Understanding the "IndentationError: unindent does not match any outer indentation level" Error in Python

When you encounter the "IndentationError: unindent does not match any outer indentation level" error in Python, it typically indicates an issue with the indentation of your code. Indentation is a crucial aspect of Python syntax, and it's important to ensure it's consistent and adheres to the correct levels.

Possible Cause: Mixed Spaces and Tabs

One common cause of this error is a mix of spaces and tabs for indentation. Python requires consistent indentation, and using both spaces and tabs can confuse the interpreter.

Solution:

To resolve this issue, perform a search and replace in your code to replace all tabs with a consistent number of spaces. For example, you can replace all tabs with four spaces.

Example:

The following Python code previously threw the indentation error:

import sys

def Factorial(n): # Return factorial
    result = 1
    for i in range (1,n):
        result = result * i
    print "factorial is ",result
    return result

By replacing all tabs with four spaces, the error is resolved:

import sys

def Factorial(n): # return factorial
    result = 1
    for i in range (1,n):
        result = result * i
    print "factorial is ",result
    return result

print Factorial(10)

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