python – IndentationError: unindent does not match any outer indentation level

python – IndentationError: unindent does not match any outer indentation level

Other posters are probably correct…there might be spaces mixed in with your tabs. Try doing a search & replace to replace all tabs with a few spaces.

Try this:

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)

IMPORTANT:
Spaces are the preferred method – see PEP 8 Indentation and Tabs or Spaces?. (Thanks to @Siha for this.)

For Sublime Text users:

Set Sublime Text to use tabs for indentation:
View –> Indentation –> Convert Indentation to Tabs

Uncheck the Indent Using Spaces option as well in the same sub-menu above.
This will immediately resolve this issue.

python – IndentationError: unindent does not match any outer indentation level

To easily check for problems with tabs/spaces you can actually do this:

python -m tabnanny yourfile.py

or you can just set up your editor correctly of course 🙂