002 - Command Line Parser

Everybody who has previously used a command line to execute a program will probably have seen that arguments can be passed to the program by typing them behind the executable name - often with a "flag" notation (for example: cmd-prompt: [program name] --in-file test.txt to hand a file to a program).

Here, we learn how to easily add this functionality to our python scripts or applications to make them more user-friendly, for example by adding help-pages.