Странная бага в питоне

Python 2.7.1+ (r271:86832, Dec 24 2010, 10:03:35) 
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 3158 + 04
3162
>>> 3158 + 05
3163
>>> 3158 + 06
3164
>>> 3158 + 07
3165
>>> 3158 + 08
  File "<stdin>", line 1
    3158 + 08
            ^
SyntaxError: invalid token
>>> 3158 + 09
  File "<stdin>", line 1
    3158 + 09
            ^
SyntaxError: invalid token
>>>