mixed-spaces-and-tabs (E101)

Derived from the pycodestyle linter.

What it does

Checks for mixed tabs and spaces in indentation.

Why is this bad?

Never mix tabs and spaces.

The most popular way of indenting Python is with spaces only. The second-most popular way is with tabs only. Code indented with a mixture of tabs and spaces should be converted to using spaces exclusively.

Example

if a == 0:\n        a = 1\n\tb = 1

Use instead:

if a == 0:\n    a = 1\n    b = 1