[ul5255]

Strange. With Python 2.6 I get [None, 7] while with Python 2.7 it is [None]. Looking at the OP codes the 2.7 one's look weird.

Python 2.6:

  >>> dis.dis(f)
    1           0 LOAD_GLOBAL              0 (g)
                3 LOAD_CONST               0 (None)
                6 YIELD_VALUE
                7 CALL_FUNCTION            1
               10 RETURN_VALUE

Python 2.7:

  >>> dis.dis(f)
    1           0 LOAD_GLOBAL              0 (g)
                3 LOAD_CONST               0 (None)
                6 YIELD_VALUE
                7 CALL_FUNCTION            1
               10 POP_TOP
               11 LOAD_CONST               0 (None)
               14 RETURN_VALUE

In essence the Python 2.7 compiler decides to throw away the result of the g() function call and replaces it with None. Does anyone understand why?

[martin_k]

Your 2.6 has a bug http://bugs.python.org/issue4748.

[ul5255]

Ahh, thanks!