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projec/

|___model/

|      |___count.py

|      |___new_count.py

|___test.py

count.py

class A():
    def add(self,a,b):
        return a +b

new_count.py

from count import A
class B (A):
    def sub(self,a,b):
        return a-b
    
result =B().add(2,5)
print(result)

test.py

import sys
sys.path .append ("./model") #将model命令添加到系统环境变量下
from model import new_count

test =new_count.B()
test.add(2,4)

输出结果：

=================================

7