Why Am I Getting an 'IndentationError: unindent does not match any outer indentation level' in My Python Code?

Indentation Errors in Python: Understanding the "IndentationError: unindent does not match any outer indentation level" Exception

When encountering the "IndentationError: unindent does not match any outer indentation level" error while compiling Python code, it's crucial to understand the source of this issue.

In Python, indentation plays a vital role in defining code blocks. Each block must be properly indented with either spaces or tabs, and the indentation must match across all lines within that block. Mixing spaces and tabs for indentation can lead to inconsistencies and trigger this error.

To resolve this issue, it's recommended to perform a thorough search and replace operation to ensure that all whitespace characters used for indentation are consistent. Typically, it's advisable to use four spaces for each indentation level.

For example, consider the following code snippet that returns the factorial of a number:

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)

By ensuring that the indentation for each line within the function block matches, this revised code snippet should compile without any indentation errors.

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