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I'm using a 3rd-party library (ESAPI) which defines a log level as the literal -2**31. This worked fine until I upgraded to Python 2.7.3, which, unlike all previous versions of Python, coerces that literal to long rather than int. The following code in the logging module then throws a TypeError:
def _checkLevel(level):
 if isinstance(level, int):
 rv = level
 elif str(level) == level:
 if level not in _levelNames:
 raise ValueError("Unknown level: %r" % level)
 rv = _levelNames[level]
 else:
 raise TypeError("Level not an integer or a valid string: %r" % level)
 return rv
Although this is certainly an unusual use case, it seems that as just a matter of principle, the module should be using the check isinstance(level, (int, long)) rather than just isinstance(level, int).
Here's the relevant part of the traceback:
 File "/usr/lib/python2.7/logging/__init__.py", line 710, in setLevel
 self.level = _checkLevel(level)
 File "/usr/lib/python2.7/logging/__init__.py", line 190, in _checkLevel
 raise TypeError("Level not an integer or a valid string: %r" % level)
TypeError: Level not an integer or a valid string: -2147483648L