Sometimes your Python code requires you to have 2 levels of indentation. The obvious thing to do is use one and two spaces for each indentation level.
However, Python 2 considers the tab and space characters to be different indenting levels.
This means the first indentation level can be one space and the second can be one tab character.
For example:
if 1:
if 1:
\tpass
pass
Where \t
is the tab character.