def tabs_or_spaces(physical_line, indent_char):
indent = INDENT_REGEX.match(physical_line).group(<NUM_LIT:1>)<EOL>for offset, char in enumerate(indent):<EOL><INDENT>if char != indent_char:<EOL><INDENT>return offset, "<STR_LIT>"<EOL><DEDENT><DEDENT>
r"""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.  When
    invoking the Python command line interpreter with the -t option, it issues
    warnings about code that illegally mixes tabs and spaces.  When using -tt
    these warnings become errors.  These options are highly recommended!

    Okay: if a == 0:\n        a = 1\n        b = 1
    E101: if a == 0:\n        a = 1\n\tb = 1