[Twisted-Python] A kinder and more consistent defer.inlineCallbacks

Jean-Paul Calderone exarkun at divmod.com
Mon Nov 24 13:07:17 EST 2008

On Sun, 23 Nov 2008 04:58:54 +0100, Terry Jones <terry at jon.es> wrote:
> [snip]
>That's what I was addressing in the code above. If you call the function in
>unwindGenerator and you get an exception, you 1) know it's not a generator
>(that's what I didn't understand earlier - calling a function with a yield
>in it can never give you an exception, Python builds you a generator and
>gives you that)

Not quite:

  >>> def f():
  ...     yield None
  >>> f(1, 2, 3)
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  TypeError: f() takes no arguments (3 given)

And unfortunately, there is essentially no way to differentiate this case
from a case where the call to `f´ succeeded but some code executed as a
result of that raised a `TypeError´.

See also <http://twistedmatrix.com/trac/ticket/2501>.


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