python之Python 中的 NameError 和 AttributeError 有什么区别

这两种错误有什么区别？何时使用它们中的每一个？

请您参考如下方法:

属性是函数、类或模块的属性，如果找不到属性，则会引发属性错误。

NameError 与变量有关。

>>> x=2 
>>> y=3 
>>> z    #z is not defined so NameError 
 
Traceback (most recent call last): 
  File "<pyshell#136>", line 1, in <module> 
    z 
NameError: name 'z' is not defined 
 
>>> def f():pass 
 
>>> f.x=2 #define an attribue of f 
>>> f.x 
2 
>>> f.y   #f has no attribute named y 
 
Traceback (most recent call last): 
  File "<pyshell#141>", line 1, in <module> 
    f.y 
AttributeError: 'function' object has no attribute 'y' 
 
>>> import math   #a module   
 
>>> math.sin(90) #sin() is an attribute of math 
0.8939966636005579 
 
>>> math.cosx(90)  #but cosx() is not an attribute of math 
 
Traceback (most recent call last): 
  File "<pyshell#145>", line 1, in <module> 
    math.cosx(90) 
AttributeError: 'module' object has no attribute 'cosx'