[Solved] Python OOP Sub class prints parent class methods then its own methods [duplicate]

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Yes, it is possible and it is what inheritance in Python does. As @deceze suggests, update the files like below:

human_class.py:

class human():
    def __init__ (self, gender="", age=0, height=0, howHigh=""):
        #setting attributes
        self.gender = ""
        self.age = 0
        self.height = 0
        self.howHigh = ""


    def setHeight(self):
        self.height = int(input("What is your height in cm? "))

    def setGender(self):
        self.gender = input("What is your gender? ")

    def setAge(self):
        self.age = int(input("What is your age? "))

    def changeHeight(self):
        if self.height < 80:
            self.howHigh = "Small"
            print("Your hieght is small!")

        elif self.height >= 80 and self.height < 180:
            self.howHigh = "Medium"
            print("Your hieght is medium!")

        elif self.height >= 180:
            self.howHigh = "Large"
            print("Your hieght is tall")

if __name__ == '__main__':
    human1 = human()
    human1.setHeight()
    human1.setGender()
    human1.setAge()
    print("human gender is ", human1.gender)
    print("Human age is", human1.age)
    print("Human height is", human1.height)
    human1.changeHeight()
    print(human1.howHigh)
    human1 = human()
    human1.setHeight()
    human1.setGender()
    human1.setAge()
    print("human gender is ", human1.gender)
    print("Human age is", human1.age)
    print("Human height is", human1.height)
    human1.changeHeight()
    print(human1.howHigh)

chlid_class.py:

from human_class import *
class child(human):
    def __init__(self):
        super().__init__()

    def setHeight(self):
        self.height = int(input("What is your height in cm? "))


    def changeHeight(self):
        if self.height < 30:
            self.howHigh = "Small"
            print("Your hieght is small for a child!")

        elif self.height >= 30 and self.height < 120:
            self.howHigh = "Medium"
            print("Your hieght is medium for a child!")

        elif self.height >= 120:
            self.howHigh = "Large"
            print("Your hieght is tall for a child!")


child1 = child()
child1.setHeight()
child1.changeHeight()
print(child1.howHigh)

What does if __name__ == '__main__': do?
From official documentation

'__main__' is the name of the scope in which top-level code executes. A module’s __name__ is set equal to '__main__' when read from standard input, a script, or from an interactive prompt.

if __name__ == "__main__":
    # execute only if run as a script

solved Python OOP Sub class prints parent class methods then its own methods [duplicate]