2022-09-29 学习Python-Day15

wyh551202

异常处理，是项目施工中常见问题，要多多注意P57-P58

1. #######################################P57
   
2. '''
   
3. 捕获处理异常
   
4. '''
   
5. try:
   
6.     1/0
   
7. except:
   
8.     print('出错了1')
   
9. try:
   
10.     print(1/1)
    
11. except:
    
12.     print('出错了2')
    
13. try:
    
14.     1/0
    
15. except ZeroDivisionError:
    
16.     print('出错了3')
    
17. try:
    
18.     1/0
    
19. except ZeroDivisionError as e:
    
20.     print(e)
    
21. try:
    
22.     1/0
    
23.     520+'aa'
    
24. except(ZeroDivisionError,ValueError,TypeError):
    
25.     pass
    
26. try:
    
27.     1/0
    
28.     520+'cc'
    
29. except ZeroDivisionError:
    
30.     print('除数不能为0')
    
31. except ValueError:
    
32.     print('值不正确')
    
33. except TypeError:
    
34.     print('类型不正确')
    
35. #######################################P58
    
36. try:
    
37.     1/0
    
38. except:
    
39.     print('有异常')
    
40. else:
    
41.     print('无异常')
    
42. try:
    
43.     1/1
    
44. except:
    
45.     print('有异常')
    
46. else:
    
47.     print('无异常')
    
48. try:
    
49.     1/1
    
50. except:
    
51.     print('有异常')
    
52. else:
    
53.     print('无异常')
    
54. finally:
    
55.     print('都会执行')
    
56. try:
    
57.     f = open('./fishc.txt','w')
    
58.     f.write('I love fishc ')
    
59. except:
    
60.     print('出错了')
    
61. finally:
    
62.    f.close()
    
63. #死循环
    
64. # try:
    
65. #     while True:
    
66. #         pass
    
67. # finally:
    
68. #     print('晚安')
    
69. try:
    
70.     try:
    
71.         520+'Fishc'
    
72.     except:
    
73.         print('内部异常')
    
74.     1/0
    
75. except:
    
76.     print('外部异常')
    
77. finally:
    
78.     print('收尾')
    
79. # raise  ValueError('值不正确')
    
80. # try:
    
81. #     1/0
    
82. # except:
    
83. #     raise ValueError('不行')
    
84. # raise ValueError('不行') from ZeroDivisionError
    
85. s='FishC'
    
86. assert s=='FishC'
    
87. # assert s!='FishC'
    
88. try:
    
89.     while True:
    
90.         while True:
    
91.             for i in range(10):
    
92.                 if i>3:
    
93.                     raise
    
94.                 print(i)
    
95.                 print('跳过')
    
96.             print('跳过')
    
97.     print('跳过')
    
98. except:
    
99.     print('到这来了')
    
100. 
     
101. try:
     
102.     1/0
     
103. except Exception as e:
     
104.     # print(e)
     
105.     f = open('./fishc1.txt', 'a+',encoding='utf-8')
     
106.     f.write(str(e))
     
107. finally:
     
108.     f.close()
     
109. 
     
110. try:
     
111.     1/0
     
112. except Exception as e:
     
113.     with open('./basic_err.txt', 'a+', encoding='utf-8')as fw:
     
114.         fw.write('err:{}'.format(str(e)) + '\n')

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chentyping

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