Question

Regarding Python 3:

1. Describe two fundamental differences between terminal-based user interfaces and GUIs.

2. Give an example of one application for which a terminal-based user interface is adequate and one example that lends itself best to a GUI

3. Describe what usually happens in the __init__ method of a main window class.

4. Explain why it's a good idea to make a new class a subclass of an existing class.

5. Write a code segment that centers the labels RED, WHITE, and BLUE vertically in a GUI window. The text of each label should have the color that it names, and the window's background color should be green. The background color of each label should also be green.

Answer 1

1. Describe two fundamental differences between terminal-based user interfaces and GUIs.

Answer:
           Terminal Based User Interfaces                               GUI
   1) Terminal Based User Interfaces are run by issuing           GUIs are iteracted through graphical icons and indicators.
       a command to them .
   2) It is difficult to understand or to remember the commands.   Even a basic user can handle the GUI.

2. Give an example of one application for which a terminal-based user interface is adequate and one example that lends itself best to a GUI

Answer:
   -> Any Application where there is a lesser complexity in choosing options like simple programs involves few options
       ex: prime number, palindrome taking input and showing results.
  
   -> Any Application where you want to apply more functionalities which makes it difficult for CLI to choose then GUI is the best.
       ex: Library Management , Chat Server, Student Management and Video and Audio Player.
       above all examples involves multiple stages of selection and moving one stage to another is becomes simple only if GUI is used.
      
3. Describe what usually happens in the __init__ method of a main window class.
Answer:

   -> __init__ () method is the constructor for python class where an object for given class will be created.
       and returned.
   -> __inti__() is the place where all the initilizations for the class are occurs.
   -> for ex: MainWindow class setting title, size etc.,

4. Explain why it's a good idea to make a new class a subclass of an existing class.
Answer:

   -> making a class as Subclass of another means inherting the all the features of the base class
   -> which makes the sub class more secured, flexible ,fast and easy to understand.
   ->ex: making a class as sub class for Frame class makes the sub class to access all the Frame class
   -> like accessing Frame class title,size and events.
  
5. Write a code segment that centers the labels RED, WHITE, and BLUE vertically in a GUI window.
The text of each label should have the color that it names, and the window's background color should be green.
The background color of each label should also be green.

#------------- gui.py ----------

import tkinter as tk
class GUI:
   def __init__(self,master):
       self.master = master
       #create 3 labels
       #tkinter by default centers the compoenents.
       self.red = tk.Label(self.master,text = "RED",fg="red",bg='green')
       self.white = tk.Label(self.master,text = "WHITE",fg="white",bg='green')
       self.blue = tk.Label(self.master,text = "BLUE",fg="blue",bg='green')
      
       self.red.config(font=("Courier", 18))
       self.white.config(font=("Courier", 18))
       self.blue.config(font=("Courier", 18))
      
       self.red.pack()
       self.white.pack()
       self.blue.pack()

root = tk.Tk()
gui = GUI(root)
root.configure(background='green')

root.mainloop()