Don't use tabs. See https://www.python.org/dev/peps/pep-0008/#tabs-or-spaces https://www.python.org/dev/peps/pep-0008/#tabs-or-spaces which says to prefer space

Don't use tabs. See https://www.python.org/dev/peps/pep-0008/#tabs-or-spaces https://www.python.org/dev/peps/pep-0008/#tabs-or-spaces which says to prefer spaces. You can start by converting all tabs into 8 spaces. This can be tricky should some strings have tabs. That's a bad idea in the first place. Use "\t". Don't mix tabs and spaces to get the same indentation level. Python 3 prohibits it. With Python 2 use "-t" or "-tt", which respectively warns and raises an exception if both spaces and tabs are used in the same block.