BaseException+-- SystemExit+-- KeyboardInterrupt+-- GeneratorExit+-- Exception+-- StopIteration+-- StandardError|    +-- BufferError|    +-- ArithmeticError|    |    +-- FloatingPointError|    |    +-- OverflowError|    |    +-- ZeroDivisionError|    +-- AssertionError|    +-- AttributeError|    +-- EnvironmentError|    |    +-- IOError|    |    +-- OSError|    |         +-- WindowsError (Windows)|    |         +-- VMSError (VMS)|    +-- EOFError|    +-- ImportError|    +-- LookupError|    |    +-- IndexError|    |    +-- KeyError|    +-- MemoryError|    +-- NameError|    |    +-- UnboundLocalError|    +-- ReferenceError|    +-- RuntimeError|    |    +-- NotImplementedError|    +-- SyntaxError|    |    +-- IndentationError|    |         +-- TabError|    +-- SystemError|    +-- TypeError|    +-- ValueError|         +-- UnicodeError|              +-- UnicodeDecodeError|              +-- UnicodeEncodeError|              +-- UnicodeTranslateError+-- Warning+-- DeprecationWarning+-- PendingDeprecationWarning+-- RuntimeWarning+-- SyntaxWarning+-- UserWarning+-- FutureWarning+-- ImportWarning+-- UnicodeWarning+-- BytesWarning

 1 #-*- coding: utf-8 -*- 2  3 #自定义异常类 4 class AuditException(Exception): 5     def __init__(self, data): 6         self.data =http://www.mamicode.com/ data 7  8     def __str__(self): 9         return self.data10 11 12 13 if __name__ == "__main__":14     try:15         raise AuditException, "The audit operation is not exist."16     except AuditException, data:17         print data #The audit operation is not exist.18 19     #或者20 21     try:22         raise AuditException, "The audit operation is not exist."23     except:24         import traceback25         traceback.print_exc()26         

try:    #do somethingexcept:    #如果引发了异常，do somethingelse:    #如果未发生异常，do something

try:    #do somethingfinally:    #不管有没有异常，do something