[ python-Bugs-1026269 ] Confusing error message when subclassing
from invalid base
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Sun Sep 12 16:22:31 CEST 2004
Bugs item #1026269, was opened at 2004-09-11 11:13
Message generated for change (Comment added) made by mwh
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Category: Python Interpreter Core
Group: Python 2.4
>Status: Closed
>Resolution: Duplicate
Priority: 5
Submitted By: Gerrit Holl (gerrit)
>Assigned to: Michael Hudson (mwh)
Summary: Confusing error message when subclassing from invalid base
Initial Comment:
In Python 2.3, subclassing from bool resulted in:
>>> class Test(bool): pass
...
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: type 'bool' is not an acceptable base type
In Python2.4a3 (latest CVS), it results in:
>>> class Test(bool): pass
...
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: Error when calling the metaclass.
Make sure the base arguments are valid.
Interestingly, also in Python 2.4a3:
>>> type("foo", (bool,), {})
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: type 'bool' is not an acceptable base type
I think it is a bug, and the error message should be
'not an acceptable base type'. Apart from that, I don't
see why it is not an acceptable base type, but that's a
different issue.
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>Comment By: Michael Hudson (mwh)
Date: 2004-09-12 15:22
Message:
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Yeah, it's the same. Closing as duplicate.
----------------------------------------------------------------------
Comment By: Gerrit Holl (gerrit)
Date: 2004-09-11 11:15
Message:
Logged In: YES
user_id=13298
This seems to be related to:
[ 1014215 ] Unspecific errors with metaclass
http://www.python.org/sf/1014215
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