I have a test folder the structure within the folder

__init.py__
aa.py
test.py

for aa.py

class aa:def __init__(self,max):self.max=maxprint max+1def hello(self):print(max)

for test.py

import aa
abc = aa(100)
abc.hello()

when run test.py, I have an error

    abc = aa(100)
TypeError: 'module' object is not callable

What is the problem?

You have a module aa, and in that module you have a class aa. You only import the module.

Either do:

import aa
abc = aa.aa(100)

or:

from aa import aa
abc = aa(100)

or, even better, use separate names for module and class.