032异常处理：你不可能总是对的

人若有情死得早

1.AssertionError:断言语句（assert）失败

>>> my_list = ['小甲鱼是帅哥']
>>> assert len(my_list) > 0
>>> my_list.pop()
'小甲鱼是帅哥'
>>> assert len(my_list) > 0
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    assert len(my_list) > 0
AssertionError

2.AttributeError:尝试访问未知的对象属性

>>> my_list.fishc
Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    my_list.fishc
AttributeError: 'list' object has no attribute 'fishc'

3.IndexError：索引超出序列范围

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

4.KeyError：字典中查找一个不存在的关键字

>>> my_dict = {'one':1, 'two':2, 'three':3}
>>> my_dict['one']
1
>>> my_dict['four']
Traceback (most recent call last):
  File "<pyshell#10>", line 1, in <module>
    my_dict['four']
KeyError: 'four'

5.NameError：尝试访问一个不存在的变量

>>> fishc
Traceback (most recent call last):
  File "<pyshell#11>", line 1, in <module>
    fishc
NameError: name 'fishc' is not defined

6.OSError：操作系统产生的异常（例如打开一个不存在的文件）

file_name = input('请输入需要打开的文件名:')
f = open(file_name)
print('文件的内容是:')
for each_line in f:
print(each_line)
========== RESTART: F:\BaiduYunDownload\《零基础入门学习Python》\py\032-1.py ==========
请输入需要打开的文件名:record
Traceback (most recent call last):
  File "F:\BaiduYunDownload\《零基础入门学习Python》\py\032-1.py", line 2, in <module>
    f = open(file_name)
FileNotFoundError: [Errno 2] No such file or directory: 'record'

7.SyntaxError：Python的语法错误

>>> print 'I love FishC.com'
SyntaxError: Missing parentheses in call to 'print'
>>> print('I love FishC.com')
I love FishC.com

8.TypeError：不同类型间的无效操作

>>> 1 + '1'
Traceback (most recent call last):
  File "<pyshell#14>", line 1, in <module>
    1 + '1'
TypeError: unsupported operand type(s) for +: 'int' and 'str'

9.ZeroDivisionError：除数为零

>>> 5 / 0
Traceback (most recent call last):
  File "<pyshell#15>", line 1, in <module>
    5 / 0
ZeroDivisionError: division by zero