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

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#3>", line 1, in <module>
   
8.     assert len(my_list) > 0
   
9. AssertionError

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2.AttributeError:尝试访问未知的对象属性

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

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3.IndexError：索引超出序列范围

1. >>> my_list = [1, 2, 3]
   
2. >>> my_list[3]
   
3. Traceback (most recent call last):
   
4.   File "<pyshell#6>", line 1, in <module>
   
5.     my_list[3]
   
6. IndexError: list index out of range
   
7. >>> my_list[2]
   
8. 3

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4.KeyError：字典中查找一个不存在的关键字

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

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5.NameError：尝试访问一个不存在的变量

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

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6.OSError：操作系统产生的异常（例如打开一个不存在的文件）

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

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7.SyntaxError：Python的语法错误

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

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8.TypeError：不同类型间的无效操作

1. >>> 1 + '1'
   
2. Traceback (most recent call last):
   
3.   File "<pyshell#14>", line 1, in <module>
   
4.     1 + '1'
   
5. TypeError: unsupported operand type(s) for +: 'int' and 'str'

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9.ZeroDivisionError：除数为零

1. >>> 5 / 0
   
2. Traceback (most recent call last):
   
3.   File "<pyshell#15>", line 1, in <module>
   
4.     5 / 0
   
5. ZeroDivisionError: division by zero

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