TypeError: module() takes at most 2 arguments (3 given) luigi code example

Example: python class typeerror module() takes at most 2 arguments (3 given)

this error is often due to the fact that the classes are at the same time modules

example: 
let's create a file A.py (module) containing a class A and the same for B.
If B extend from A then to import class A into B we do:
from A_module import A_className


in our example:

the python code will be:
import A from A
class B(A):
	....