Answer:
In your code you need add a parameter which is called
self
to all of your function in the class OverViewOfWork
So write your code like:
class OverViewOfWork(Utilities.Utility):
def TotalHourWorked(self):
pass
def DaysWorked(self):
pass
def AvarageWorks(self):
pass
def Salary(self):
pass
Let me know if it is working for you or not. Happy coding.