Python 3 is stricter with regard to using tabs instead of space (PEP8):
Spaces are the preferred indentation method.
Tabs should be used solely to remain consistent with code that
is already indented with tabs.
Python 3 disallows mixing the use of tabs and spaces for
indentation.
Python 2 code indented with a mixture of tabs and spaces should
be converted to using spaces exclusively.
Pierre Kancir
Pierre Kancir
Lucas De Marchi
Andrew Tridgell
Andrew Tridgell