4.常见异常

'''
常见异常
'''

from model.User import User

'''
AttributeError异常
试图访问一个类中不存在的成员（包括：成员变量、属性和成员方法）而引发的异常

AttributeError: 'User' object has no attribute 'aaa'
'''
user = User("chao", 18)
print(user.aaa)

'''
OSError异常
操作系统相关异常

FileNotFoundError:[Error 2] No such file or directory: 'abc.txt'
'''

'''
IndexError异常
访问序列元素时，下标索引超出取值范围所引发的异常

IndexError: list index out of range
'''

'''
KeyError异常
试图访问字典里不存在的键时而引发的异常

>>> dict[104]
Traceback(most recent call last):
    File"<pyshell#14>", line1, in <module>
        dict1[104]
KeyError: 104
'''

'''
NameError异常
试图使用一个不存在的变量而引发的异常

NameError: name 'value1' is not defined
'''

'''
TypeError异常
传入变量类型与要求的不符合时而发生的异常

>>> i = '2'
>>> print(5 / i)
Traceback(most recent call last):
    File"<pyshell#20>", line1, in <module>
        print(5 / i)
TypeError: unsupported operand type(s) for /: 'int' and 'str'
'''

'''
ValueError异常
传入一个无效的参数值而引发的异常

>>> i = 'QWE'
>>> print(5 / int(i))
Traceback(most recent call last):
    File"<pyshell#22>", line1, in <module>
        print(5 / int(i))
ValueError: invalid literal for int() with base 10: 'QWE'
'''