test_difflib.py 文件源码

def test_range_format_unified(self):
        # Per the diff spec at http://www.unix.org/single_unix_specification/
        spec = '''\
           Each <range> field shall be of the form:
             %1d", <beginning line number>  if the range contains exactly one line,
           and:
            "%1d,%1d", <beginning line number>, <number of lines> otherwise.
           If a range is empty, its beginning line number shall be the number of
           the line just before the range, or 0 if the empty range starts the file.
        '''
        fmt = difflib._format_range_unified
        self.assertEqual(fmt(3,3), '3,0')
        self.assertEqual(fmt(3,4), '4')
        self.assertEqual(fmt(3,5), '4,2')
        self.assertEqual(fmt(3,6), '4,3')
        self.assertEqual(fmt(0,0), '0,0')