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1st Semester
CodeTantra

Unit 6 - Lesson 9

65.1.1. Packages overview

(a) Packages can be thought as directories with some specific rules.
(c) Each package should have a file called __init__.py

65.1.2. Writing a simple package with two modules

import Robots.Car # import Robots.Car and Robots.House using dot operator (.)
import Robots.House

Robots.Car.cleancar() # function cleancar is called form the Car modules

# Call the checkcar() function from the Car module
Robots.Car.checkcar()
# Call the cleanhouse() function from the House module
Robots.House.cleanhouse()
# Call the payrent() function from the House module
Robots.House.payrent()

65.1.3. Writing an example to create a robot calculator by importing packages.

---------------robot_calculator.py---------------

# import Robots.MathRobot using dot operator (.)
import Robots.MathRobot
# Displaying the available operations
print("Select an operation:")
print("1. Addition")
print("2. Subtraction")
print("3. Multiplication")
choice = input("choice (1/2/3): ")

if choice == '1':
	# call add_numbers function from the Robots.MathRobot module
	Robots.MathRobot.add_numbers()
elif choice == '2':
	# call subtract_numbers function from the Robots.MathRobot module
	Robots.MathRobot.subtract_numbers()

elif choice == '3':
	# call multiply_numbers function from the Robots.MathRobot module
	Robots.MathRobot.multiply_numbers()
	
else:
    print("Invalid choice")

print("Goodbye!")


---------------MathRobot.py---------------

def add_numbers():
	# take two inputs from the user
	a = float(input("num1:"))
	b = float(input("num2:"))
	# calculate sum
	# print the result
	print("sum:",a+b)

def subtract_numbers():
	# take two inputs from the user
	a = float(input("num1:"))
	b = float(input("num2:"))
	# calculate difference
	# print the result
	print("difference:",a-b)

def multiply_numbers():
	# take two inputs from the user
	a = float(input("num1:"))
	b = float(input("num2:"))
	# multiply two numbers
	# print the result
	print("product:",a*b)

65.1.4. Using the from keyword

from Robots.Office import Office
# Import Factory class from its respective module
from Robots.Factory import Factory

# Created instance of Office class
if __name__ == "__main__":
    office_robot = Office()
    factory_robot = Factory()

    # Called the methods on the office_robot instance
    office_robot.cleanoffice()
    office_robot.schedule_meetings()
    # Call the methods on the factory_robot instance
    factory_robot.assemble_products()
    factory_robot.perform_quality_check()

65.1.5. Using from and import

# import Car2 from Robots
import Robots.Car2
# call the functions in the file Car2 here
Robots.Car2.checkcar()
Robots.Car2.cleancar()

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