[Tutor] Poorly understood error involving class inheritance
David Perlman
dperlman at wisc.edu
Thu Sep 10 22:13:23 CEST 2009
I'm not sure why I'm getting an error at the end here:
>>> class dummy:
... def __init__(self,dur=0):
... self.dur=dur
...
>>> z=dummy(3)
>>> z.dur
3
>>> z=dummy(dur=3)
>>> z.dur
3
That worked fine, of course.
>>> class dummy2(str):
... def __init__(self,dur=0):
... self.dur=dur
...
>>> z=dummy2(3)
>>> z.dur
3
So far so good. But:
>>> z=dummy2(dur=3)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'dur' is an invalid keyword argument for this function
>>>
Why doesn't that last bit work? I'm not sure where to begin to look
this up.
Thanks!
--
-dave----------------------------------------------------------------
"Pseudo-colored pictures of a person's brain lighting up are
undoubtedly more persuasive than a pattern of squiggles produced by a
polygraph. That could be a big problem if the goal is to get to the
truth." -Dr. Steven Hyman, Harvard
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