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      1 from sys import version_info
      2 
      3 if version_info[0] <= 2:
      4     int2oct = chr
      5     ints2octs = lambda s: ''.join([ int2oct(x) for x in s ])
      6     null = ''
      7     oct2int = ord
      8     octs2ints = lambda s: [ oct2int(x) for x in s ]
      9     str2octs = lambda x: x
     10     octs2str = lambda x: x
     11     isOctetsType = lambda s: isinstance(s, str)
     12 else:
     13     ints2octs = bytes
     14     int2oct = lambda x: ints2octs((x,))
     15     null = ints2octs()
     16     oct2int = lambda x: x
     17     octs2ints = lambda s: [ x for x in s ]
     18     str2octs = lambda x: x.encode()
     19     octs2str = lambda x: x.decode()
     20     isOctetsType = lambda s: isinstance(s, bytes)
     21