Python Classroom notes 05/Sep/2024

Object oriented programming contd..

Movie ticketing system (rough design)

• Classes:
  • Movie
  • Theatre
  • Screen
  • Screening
  • Seat
  • Booking
  • Payment
• Refer Here for rough implementation Refer Here

Public and private in python

• Python doesnot support public and private specifically but there are conventions
• any member of method with a name starting from _ is generally considered private
• If you want users not to access private give the name starting from __ (double underscore)

Application Types

• Command line applications
• Desktop/Thick client applications (We are not covering this)
• Web applications (We are not covering this)
• Web apis

Command Line Application

Hello cli

• Write a program to say hello by taking only one argument from command line
  

Add cli

• Write a program to add two numbers

python add.py 1 2
1 + 2 = 3

• Refer Here for solution

Some command line examples

ansible-playbook --inventory hosts test.yaml

# keyword arguments
add --number1 10  --number2 20
# positional arguments
add 10 20 

Commandline Password Manager

• User should be passing digits
• Version 1: Generate password

pmanager --length 16

• Version 2: Give user some options for including special characters

pmanager --length 16 --include-special "@*_#"

• Version 3: Give option for user to generate password and provide save and service name

pmanager generate --service gmail --length 12 --include-special "@&"

• Version 4: Start saving passwords to a text file

pmanager generate --service gmail --length 12 --include-special "@&"
pmanager retrieve --service gmail

• Version 5: Save passwords to an encrypted file

pmanager generate --service gmail --length 12 --include-special "@&" --secret "india123"
pmanager retrieve --service gmail --secret "india123"

Exercise

• Try going through the following
  • Argument Parser
  • Read, Write, append files in python

Markdown format

• Refer Here