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

Indent with Spaces or Tabs Consistently

When you encounter the "IndentationError: unindent does not match any outer indentation level" error in Python, despite seemingly correct indentation, it often indicates an inconsistency in indentation.

Specifically, Python requires consistent use of either spaces or tabs for indentation. Mixing these characters can lead to confusion and raise the above error.

For Example:

Consider the following code:

import sys

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

This code produces the error because there's a mix of tabs and spaces in the indentation. To fix it, replace the tabs with spaces or vice versa.

Using Spaces:

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))

Using Tabs:

import sys

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

print(Factorial(10))

Ensure that indentation is consistent throughout your code and avoid mixing spaces and tabs to prevent this error.

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