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djc@miles ~ $ python2.7
Python 2.7 (r27:82500, Oct 4 2010, 10:01:41)
[GCC 4.3.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> {}.pop('a')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
KeyError: 'pop(): dictionary is empty'
>>> {'a': 'b'}.pop('c')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
KeyError: 'c'
IMO the former exception should be in line with normal KeyErrors.