Question

What is the diffference between those 2 types of errors? When to use each one of them?

Answer 1

Attributes are properties of functions or classes or modules, and if a property is not found then it raises attribute error.

NameError are related to variables.

>>> 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'