Click is library to build command line for scripts https://click.palletsprojects.com/en/8.1.x/.

It helps in type checking input i.e. you cannot enter integer for string arguments, printing nice help page etc.

Just trying to think of a new feature that we can add now that we are familiar with basic API and have got something working.

I am thinking of a feature where after seeing the alert for price, user can send a command to bot to change the max/min limit for alerting.

Black is code formatter which everyone in Python uses to format the code. It formats the code to make it nice and also makes sure that code looks similar even when multiple developers are contributing to it. https://github.com/psf/black

Black playground is available here.

Follow up:

1. Configure VSCode to autoformat python code with black on save.

Any big project should have tests. It makes us confident in new changes that we add in that they don't break existing functionality.

Lets add tests for get_current_price and discord_bot function that were written in https://github.com/MohitPatni0731/Discord-bot/pull/1/files. (hint: to bring functions under test we will have to refactor discord_bot function to accept whatever it expects as input inside it as function parameter.)

All modern python code is always written with type hints https://www.pythontutorial.net/python-basics/python-type-hints/.

Type hints helps callers in understanding what type of arguments are taken in by functions and what type of return value to expect in return.

Follow up:

• Run mypy to validate type hints https://realpython.com/lessons/type-checking-mypy/ (this whole course is small and worth reading to get quick understanding of types in python)

After completing this tasks one should be able to know:

1. What is static vs dynamic typing?
2. What is duck typing?
3. Type hinting in python
4. What is mypy