The best way to learn is by doing it!
Welcome to the Py-Lambdas Code Challenges Page.
These are code challenges and mini coding projects created by our Py-Lambdas community.
We think that sites like LeetCode, Exercism, HackerRank, etc. have their place; and the thing they're very good at in particular is preparing you for a whiteboarding interview. We're very decidedly not providing that service.
We see these challenges as the best way to deepen your Python knowledge specifically, and as a result focus on topics and skills specifically related to being a better Python developer.
If that sounds like something you're interested in, welcome!
Fork this repository and start coding away!🚀 Test your solution by running the associated unit test.
Within the directory of your code challenge, run the following command for unit testing:
python -m unittestAbsolutely! All challenges have associated unit tests to check if the code is correct or not. However, we would love any help in manual code review when possible! We want this to be a community effort.
Yes! Please take a look through our currently open challenge:new-addition) issues and pick one that you think sounds interesting to work on.
An example of a good challenge to use as a template for now would be the Circle challenge. Specifically, your new challenge should have:
- An informational
README.mdcontaining:- information about the challenge, and examples of the behavior you'll be testing for.
- (Optionally) a bonus or two that stretch people to think more pythonically
- A "Hints" section which links to documentation, articles, videos, and/or particularly informative Stack Overflow answers which provide the knowledge and background necessary to complete the challenge
- A test file
- tests should be written with
unittestand notpytest. No one should have to pip install anything to complete or test a challenge - tests should be documented with docstrings so that people can look over the test file and know which requirement of the challenge each test is checking
- Optional bonus challenges should have their tests decorated with the
@unittest.expectedFailuredecorator, and a comment telling people know to comment that decorator out if they'd like to attempt the bonus - The test file should be named
test_{CHALLENGE_NAME}.pywhere{CHALLENGE_NAME}is the name of the challenge you're creating. - The test file should import the required classes/functions/etc. from the stub file (see below)
- tests should be written with
- A stub file for the challenge
- The stub file should be named
{CHALLENGE_NAME}.pywhere{CHALLENGE_NAME}is the name of the challenge you're creating. - The stub file should only contain the absolute minimum and required objects necessary. For example, if your challenge is to create an
addfunction that takes two numbers and returns their sum, your stub file should containdef add(): passand the person completing the challenge should be responsible for all other implementation details, including function parameters. - If your challenge/your tests do not rely on any required function / class names, your stub file should be empty.
- The stub file should be named
Once you've created a challenge that meets the above structure and performs the way you'd like, make a Pull Request to the challenges branch with any challenges you want to add.
Prior to submitting, please run your code through black to standardize formatting.
Yes! Reach out on Discord for any help you may need!
Submit all issues here. Issue submissions should include specific filename and the problem. If you have a solution for the bug, include that as well! 😀
Challenges are organized from Very Easy -> Expert. Within each category, they are in no particular order.
This series of challenges is meant to ensure you understand the basics of Python. You may complete them in order, or jump around if there's a particular topic you'd like to challenge yourself on.
| name | topics | author |
|---|---|---|
| Coordinates | variables, numbers, types |
@duckeverlasting |
| Log Transfer | variables, numbers, strings, types |
@duckeverlasting |
| Messages | strings, control flow |
@brannanc |
| Greetings | functions, parameters, annotations |
@brannanc |
| Circle | classes, properties, dunder methods |
@nickcannariato |
Now that you've got the essentials of Python under your belt, these challenges are meant to take you on a tour of some of the more commonly seen yet Python-specific features of the language.
| name | topics | author |
|---|---|---|
| add | comprehensions |
@nickcannariato |
| compact | comprehensions, generators |
@nickcannariato |
| tail | sequences, iterators, queues |
@nickcannariato |
Most programming language have opinions that are particular or peculiar, and Python is no exception. Static types vs dynamic types, pass by value or pass by reference, How you should raise and react to errors, etc. These challenges are meant to expose you to those peculiarities and help you think pythonically
| name | topics | author |
|---|---|---|
| PLACEHOLDER | PLACEHOLDER |
@PLACEHOLDER |
Python allows for both Object-oriented programming and Functional programming, and these challenges are designed to help you learn how it thinks about both of of those paradigms.
| name | topics | author |
|---|---|---|
| PLACEHOLDER | PLACEHOLDER |
@PLACEHOLDER |
Now that you've got a really good handle on Python's language features, we're gonna give you a detailed tour of Python's Standard Library.
The particular module(s) used by a given challenge will be listed in the modules column, which you'll notice has replaced the topics column above.
| name | modules | author |
|---|---|---|
| fix_csv | csv, argparse |
@nickcannariato |
This misc folder of includes more traditional whiteboarding-focused challenges.
As mentioned earlier in this README, this is not the focus of this repository or the challenges we're currently interested in accepting, but we wanted to include them and potentially add to them in the future.