【Pyton】【小甲鱼】异常处理：你不可能总是对的

Exception

1.assertionerror举例

 1 >>> my_list=[‘小甲鱼是帅哥‘]
 2 >>> assert len(my_list)>0
 3 >>> my_list.pop()
 4 ‘小甲鱼是帅哥‘
 5 >>> assert len(my_list)>0
 6 Traceback (most recent call last):
 7   File "<pyshell#6>", line 1, in <module>
 8     assert len(my_list)>0
 9 AssertionError
10 >>> 

2.attribute举例

1 >>> my_list.fishc #实际上my_list这个对象并没有fishc这样的属性，所以会报错
2 Traceback (most recent call last):
3   File "<pyshell#7>", line 1, in <module>
4     my_list.fishc
5 AttributeError: ‘list‘ object has no attribute ‘fishc‘

3.indexerror举例

1 >>> my_list=[1,2,3]
2 >>> my_list[3]
3 Traceback (most recent call last):
4   File "<pyshell#9>", line 1, in <module>
5     my_list[3]
6 IndexError: list index out of range

4.keyerror举例

1 >>> my_dict={‘one‘:1,‘two‘:2,‘three‘:3}
2 >>> my_dict[‘one‘]
3 1
4 >>> my_dict[‘four‘] #访问的字典元素不存在
5 Traceback (most recent call last):
6   File "<pyshell#12>", line 1, in <module>
7     my_dict[‘four‘]
8 KeyError: ‘four‘
9 >>> my_dict.get(‘four‘) #使用get方法可以避免报错的出现，以避免让用户看到报错

5.nameerror举例

1 >>> fishc #尝试访问一个不存在的变量
2 Traceback (most recent call last):
3   File "<pyshell#14>", line 1, in <module>
4     fishc
5 NameError: name ‘fishc‘ is not defined

6.typeerror举例（不同类型间的无效操作）

1 >>> 1+‘1‘ #‘1’
2 Traceback (most recent call last):
3   File "<pyshell#17>", line 1, in <module>
4     1+‘1‘
5 TypeError: unsupported operand type(s) for +: ‘int‘ and ‘str‘

7.zerodivisionerror举例

1 >>> 5/0
2 Traceback (most recent call last):
3   File "<pyshell#18>", line 1, in <module>
4     5/0
5 ZeroDivisionError: division by zero