Module 3: Graphical User Interface (GUI)

Try

• Object-Oriented coding in Python
  1. Consider things in a real-world, e.g., schools entered, countries visited, companies worked, etc.
     • Take multiple elements and some relations among the elements in the real-world.
     • Group the elements into a few classes, so that each element can fall in a class.
     • Make sure that a class is defined over the features on those member elements.
     • In addition to the structural definition of a class, there may be behavioral definitions. Behavioral definitions can be the methods of a class, and they are executed on an element(s).
• Write a Python program to define the class called "Conversion".
  • This class has one feature, called inNum. Note that this number can be a temperature or a mass, etc. This variable of Conversion will have a value when an object is constructed (or init_ialized) as follows:

    def __init__ (self, inNum):
        self.inNum = inNum
    

    This init() method usually appears first in the body of its class. After the init() method, as many behavioral methods as needed can be defined.
  • This class has four methods
    • c2f(), which takes a number (read inNum) in Celsius and prints another number (save into outNum) in Fahrenheit
    • f2c(), which takes a number (read inNum) in Fahrenheit and prints another number (save into outNum) in Fahrenheit.
    • kg2lb(), which takes a number (read inNum) in kb and prints another number (save into outNum) in lb.
    • lb2kg(), which takes a number (read inNum) in lb and prints another number (save into outNum) in kg.
  • Multiple class members can be constructed.
    • c1 = Conversion(67)
    • c2 = Conversion(159)
    • c3 = Conversion(24)
    • more
  • Call the above functions as follows:
    • c1.c2f()
    • c2.f2c()
    • c2.c2f()
    • c2.lb2kg()
    • c3.kg2lb()
    • c3.f2c()
    • more
  • Note that inNum is loaded when an object is constructed and so the __init()__ method is executed, and outNum is loaded when a method is invoked.