> Aha, that's useful to know. So it's a no-no to subclass *any* builtin?
I don't think it's a no-no, I just think it comes with a few problems that are
solved if you subclass the classes that are *meant* to be subclassed, like
UserDict, UserList, or UserString.
> I checked collections.UserDict and it indeed looks promising. Caveat: it;s
> Python 3 only (not sure what versionit was introduced).
It's in both Python 2 and 3, but they're not in the same module. That's why I
used the following construct to import it. In both cases, UserDict is imported
correctly and the module where it came from does not matter.
try:
from collections import UserDict
except ImportError:
from UserDict import UserDict
Here are the docs:
- Python 2: https://docs.python.org/2/library/userdict.html
- Python 3:
https://docs.python.org/3/library/collections.html#collections.UserDict
Regards,
Alex
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