python異常處理

標籤：處理   try   class   color   python   div   nal   int   print   

總結

• try中發生異常，執行except

• try中不發生異常，執行else

• try中的異常會阻止try接下來的所有操作

• try中的return會阻止else的執行

• 任何return都不會阻止finally的執行

 1 def except_no_return(): 2     """ 3     try中發生異常，執行except 4     輸出：in try-in except-in finally-None 5     :return:  6     """ 7     try: 8         print(‘in try‘) 9         a = 1/010     except ZeroDivisionError:11         print(‘in except‘)12     else:13         print(‘in else‘)14     finally:15         # 返回這個16         print(‘in finally‘)17 18 19 def else_no_return():20     """21     try中不發生異常，執行else22     輸出：in try-in else-in finally-None23     :return: 24     """25     try:26         print(‘in try‘)27     except ZeroDivisionError:28         print(‘in except‘)29     else:30         print(‘in else‘)31     finally:32         # 返回這個33         print(‘in finally‘)34 35 36 def try_except_finally():37     """38     try中的異常會阻止try接下來的所有操作39     輸出：in try-in else-in finally-return in finally40     :return: 41     """42     try:43         print(‘in try‘)44         a = 1/045         return "return in try"46     except ZeroDivisionError:47         print(‘in except‘)48         return "return in except"49     else:50         print(‘in else‘)51         return "return in else"52     finally:53         # 返回這個54         print(‘in finally‘)55         return "return in finally"56 57 58 def try_finally():59     """60     try中的return會阻止else的執行61     輸出：in try-in finally-return in finally62     :return: 63     """64     try:65         print(‘in try‘)66         return "return in try"67     except ZeroDivisionError:68         print(‘in except‘)69         return "return in except"70     else:71         print(‘in else‘)72         return "return in else"73     finally:74         # 返回這個75         print(‘in finally‘)76         return "return in finally"77 78 79 def try_else_finally():80     """81     任何return都不會阻止finally的執行82     輸出：in try-in else-in finally-return in finally83     :return: 84     """85     try:86         print(‘in try‘)87     except ZeroDivisionError:88         print(‘in except‘)89         return "return in except"90     else:91         print(‘in else‘)92         return "return in else"93     finally:94         # 返回這個95         print(‘in finally‘)96         return "return in finally"

 

python異常處理