test_exceptions
5. Built-in exceptions
AttributeError
EOFError
IOError
ImportError
IndexError
KeyError
KeyboardInterrupt
(not testable in a script)
MemoryError
(not safe to test)
NameError
OverflowError
RuntimeError
(not used any more?)
SyntaxError
SystemError
(hard to reproduce)
SystemExit
TypeError
ValueError
ZeroDivisionError
