class Test (object):
    def __init __ (self):
        self.test = 0
class Test2 (Test):
    def __init __ (self):
        Test () .__ init __ (self)
    def hoge (self, data):
        print (data)

If i have defined a class like the above, you can add the hoge method of the parent class: Test to the child class: Test2 to the parent class:
Please teach me how to call with Test.

  • Answer # 1

    You can use it if you call.

    class Parent:
        def func_p (self):
            print ('func_p')
            self.func_c (42)
    class Child (Parent):
        def func_c (self, data):
            print ('func_c')
            print (data)
    ch = Child ()
    ch.func_p ()

    However, this design is bad because the parent class depends on the child class.
    If you actually write code like the following, you'll get an error:

    pr = Parent ()
    pr.func_p () # AttributeError: 'Parent' object has no attribute 'func_c'

    There are some workarounds, but it is better to revisit the design itself.

    When using the parent class as an abstract class,
    In other words, this is not the case if instantiating the Parent itself is incorrect.