Playground and Cheatsheet for Learning Python
This is a collection of Python scripts that are split by topics and contain code examples with explanations, different use cases and links to further readings.
It is a playground because you may change or add the code to see how it works and test it out using assertions. It also allows you to lint the code you've wrote and check if it fits to Python code style guide. Altogether it might make your learning process to be more interactive and it might help you to keep code quality pretty high from very beginning.
It is a cheatsheet because you may get back to these code examples once you want to recap the syntax of standard Python statements and constructions. Also because the code is full of assertions you'll be able to see expected functions/statements output right away without launching them.
How to Use This Repository
Each Python script in this repository has the following structure:
"""Lists <--- Name of the topic here # @see: https://www.learnpython.org/en/Lists <-- Link to further readings goes here Here might go more detailed explanation of the current topic (i.e. general info about Lists). """ def test_list_type(): """Explanation of sub-topic goes here. Each file contains test functions that illustrate sub-topics (i.e. lists type, lists methods). """ # Here is an example of how to build a list. <-- Comments here explain the action squares = [1, 4, 9, 16, 25] # Lists can be indexed and sliced. # Indexing returns the item. assert squares == 1 # <-- Assertions here illustrate the result. # Slicing returns a new list. assert squares[-3:] == [9, 16, 25] # <-- Assertions here illustrate the result.
So normally you might want to do the following:
- Find the topic you're want to learn or recap.
- Read comments and/or documentation that is linked in each script's docstring (as in example above).
- Look at code examples and assertions to see usage examples and expected output.
- Change code or add new assertions to see how things work.
- Run tests and lint the code to see if it work and is written correctly.
Table of Contents
- Getting Started
- Data Types
- Control Flow
- Errors and Exceptions
- Brief Tour of the Standard Libraries
Make sure that you have Python3 installed on your machine.
You might want to use venv standard Python library to create virtual environments and have Python, pip and all dependent packages to be installed and served from the local project directory to avoid messing with system wide packages and their versions.
Depending on your installation you might have access to Python3 interpreter either by running
python3. The same goes for pip package manager - it may be accessible either by running
You may check your Python version by running:
Note that in this repository whenever you see
python it will be assumed that it is Python 3.
Install all dependencies that are required for the project by running:
pip install -r requirements.txt
Testing the Code
Tests are made using pytest framework.
You may add new tests for yourself by adding files and functions with
test_ prefix (i.e.
def test_sub_topic() function inside).
To run all the tests please execute the following command from the project root folder:
To run specific tests please execute:
Linting the Code
Linting is done using pylint library.
To check if the code is written with respect to PEP 8 style guide please run:
In case if linter will detect error (i.e.
missing-docstring) you may want to read more about specific error by running: