1 # while True: print('Hello World!')
2 print('异常有不同的类型，这些类型都作为信息的一部分打印出来：以下例子中的类型有ZeroDivisiongError，NameError和TypeError')
3 # print(10*(1/0))
4
5 # print(4+spam*3)
6
7 # print('2'+2)
8
9 print('Enter a number,if not give a exception')
10 while True:
11 try:
12 str = int(input('Please enter a number'))
13 # break
14 except ValueError:
15 print('Oops,That was no valid number .Try again ')
16
17 print('except(RuntimeError,ValueError,TypeError,NameError)')
18 import sys
19 try:
20
21 f = open('E:\\foo.txt')
22 s = f.readline()
23 i = int(s.strip())
24 except OSError as err:
25 print('OS error:{}'.format(err))
26
27 except ValueError:
28 print('Could not conver a data to a integer.')
29 except:
30 print('Unexpected error:',sys.exc_info()[0])
31 raise
32
33 print('example2----------------------------------------------------------')
34 import sys
35 for foo in sys.argv[1:]:
36 try:
37 f = open(foo,'r')
38 except IOError:
39 print('cannot open',foo)
40 else:
41 print(foo,'has',len(f.readlines()),'lines')
42 f.close()
43
44 print('heheda-------------------------------------')
45 def this_fails():
46 x = 1/0
47 try:
48 this_fails()
49 except ZeroDivisionError as err:
50 print('Handling run-time error:',err)
51
52 print('hehda-------------------------------------')
53 raise NameError('HiThere')
54 try:
55 raise NameError('HiThere')
56 except NameError:
57 print('An exception flew by!')
58 raise
59
60 print('hehda----------------------------------------------')
61 class MyError(Exception):
62 def __init__(self,value):
63 self.value = value
64 def __str__(self):
65 return repr(self.value)
66 try:
67 raise MyError(2*2)
68 except MyError as e:
69 print('My exception occurred,value:'.format(e.value))
70
71 print('hehda----------------------------------------------')
72
73
74 class MyError(Exception):
75 def __init__(self, value):
76 self.value = value
77
78 def __str__(self):
79 return repr(self.value)
80
81 try:
82 raise MyError(2 * 2)
83 except MyError as e:
84 print('My exception occurred,value:'.format(e.value))
85
86 raise MyError('oops!')
