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For example:
>>> import pwd
>>> pwd.getpwnam("test")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
KeyError: "getpwnam(): name not found: 'test'"
An improvement would be something which doesn't have the extra set of quotes such as:
>>> import pwd
>>> pwd.getpwnam("test")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
KeyError: getpwnam(): name not found: 'test'
I understand this is due to the `KeyError` repr, I wonder if something could be done to improve this (maybe a subclass of KeyError? maybe a new optional named-only argument to KeyError?)
Seems there are others which could be improved here as well:
>>> import unicodedata
>>> unicodedata.lookup('zzz')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
KeyError: "undefined character name 'zzz'"