异常处理
1 a = [1,2,3]
2 d = {}
3 #例子1：
4 #判断key异常
5 try:
6 d['name']
7 except KeyError as e:
8 print("字典key不存在",e)
9 else:
10 print('正常运行')
11 finally:
12 print("有没有异常都走这里")
13
14 #例子2
15 #判断下标异常
16 try:
17 a[3]
18 except IndexError as e:
19 print('下标越界')
20 else:
21 print('正常运行')
22 finally:
23 print('有没有异常都走这里')
24
25 # 例子3
26 #捕捉全部异常
27 try:
28 a[3]
29 d['name']
30 except Exception as e:
31 print('出现异常了')
32 finally:
33 print('有没有异常都走这里')
34
35 #raise主动抛出异常
36 price = input('price:')
37 if not price.isdigit():
38 raise Exception('价格错误')
