Python Classroom notes 14/Apr/2026

Building Command line Applications

• A command line application helps in
  • a simpler interfaces
  • easy to automate
• A command line application is supposed to have
  • help
  • validations
• Generally command line applications have two types of arguments
  • positional arguments
  • named arguments
• Prompt:

Give me examples on building a write cli command
   with named arguments

I'm interested in style rather than code

• Python has an inbuilt argparse module

• Steps:

  • Create a parser
  • Tell what arguments your program accepts
  • Ask it to parse command line
  • use the parsed arguments

• Positional arguments: These are required values based on position

  • parser.add_argument('name')

• Optional arguments: They usually start with - or --

• Refer Here for changes to build a cli app.