(source)
return result
r"""Replace all chars except '\f\t' in a line with spaces.
r"""Replace all chars except '\f\t' in a line with spaces.
r Replace all chars except \ f \ t in a line with spaces .
def _pad_whitespace(source):
    r"""Replace all chars except '\f\t' in a line with spaces."""
    result = ''
    for c in source:
        if c in '\f\t':
            result += c
        else:
            result += ' '
    return result
def _pad_whitespace ( source ) : result = '' for c in source : if c in '\f\t' : result += c else : result += ' ' return result