More example

employee.py

# file name: employee.py
# calculating the gross pay

class Employee:

    def __init__(self, name, job, salary):
        self.name = name
        self.job = job
        self.salary = salary

        # some constants
        self.WORKING_DAYS_IN_A_MONTH = 30
        self.WORKING_HOURS_IN_A_DAY = 12
        self.PAY_RATE = 0.25

        # the total number of hours the employee should 
        # have done in a whole month
        self.WORKED_HOURS = self.WORKING_HOURS_IN_A_DAY * self.WORKING_DAYS_IN_A_MONTH

    # calculate the gross pay based on the time employee 
    # did for the whole month
    # the hours here is the total hours that the employee 
    # has overworked
    def return_gross_pay(self, hours):
        gross_pay = 0

        if hours > self.WORKED_HOURS:
            over_time = hours - self.WORKED_HOURS
            over_time_pay = over_time + (self.salary * self.PAY_RATE)

            gross_pay = self.salary + over_time_pay
        else:
            gross_pay = self.salary

        return gross_pay