raise Exception  # 使用無(wú)參初始化
raise Exception('Exception', 200)  #帶參初始化
try:
    raise Exception()
except:
    raise # 拋出上面的異常實(shí)例

try:
    1 / 0 # 將會(huì)觸發(fā)0除異常 ZeroDivisionError
except SystemExit as e: # 不是ZeroDivisionError異常的祖先類，捕獲不到
    print('SystemExit', e)
except ZeroDivisionError as e:# 捕獲ZeroDivisionError異常
    print('ZeroDivisionError', e)
else:
    print('else') # 有異常，else語(yǔ)句不執(zhí)行
finally:
    print('fianlly')
>>>ZeroDivisionError division by zero
>>>finally
try:
    x = 1 # 不產(chǎn)生異常
except SystemExit as e: 
    print('SystemExit', e)
except ZeroDivisionError as e:
    print('ZeroDivisionError', e)
else:
    print('else') # 沒有異常，else語(yǔ)句被執(zhí)行
finally:
    print('fianlly') # finally中的語(yǔ)句依舊被執(zhí)行
>>>else
>>>finally    

def get_int(data):
    """
    轉(zhuǎn)換一個(gè)值為int類型
    """
    try:
        return int(data)
    except:
        return 0

BaseException
 +-- SystemExit
 +-- KeyboardInterrupt
 +-- GeneratorExit
 +-- Exception
      +-- StopIteration
      +-- StopAsyncIteration
      +-- ArithmeticError
      |    +-- FloatingPointError
      |    +-- OverflowError
      |    +-- ZeroDivisionError
      +-- AssertionError
      +-- AttributeError
      +-- BufferError
      +-- EOFError
      +-- ImportError
      |    +-- ModuleNotFoundError
      +-- LookupError
      |    +-- IndexError
      |    +-- KeyError
      +-- MemoryError
      +-- NameError
      |    +-- UnboundLocalError
      +-- OSError
      |    +-- BlockingIOError
      |    +-- ChildProcessError
      |    +-- ConnectionError
      |    |    +-- BrokenPipeError
      |    |    +-- ConnectionAbortedError
      |    |    +-- ConnectionRefusedError
      |    |    +-- ConnectionResetError
      |    +-- FileExistsError
      |    +-- FileNotFoundError
      |    +-- InterruptedError
      |    +-- IsADirectoryError
      |    +-- NotADirectoryError
      |    +-- PermissionError
      |    +-- ProcessLookupError
      |    +-- TimeoutError
      +-- ReferenceError
      +-- RuntimeError
      |    +-- NotImplementedError
      |    +-- RecursionError
      +-- SyntaxError
      |    +-- IndentationError
      |         +-- TabError
      +-- SystemError
      +-- TypeError
      +-- ValueError
      |    +-- UnicodeError
      |         +-- UnicodeDecodeError
      |         +-- UnicodeEncodeError
      |         +-- UnicodeTranslateError
      +-- Warning
           +-- DeprecationWarning
           +-- PendingDeprecationWarning
           +-- RuntimeWarning
           +-- SyntaxWarning
           +-- UserWarning
           +-- FutureWarning
           +-- ImportWarning
           +-- UnicodeWarning
           +-- BytesWarning
           +-- ResourceWarning