Merge pull request #273 from codecrafters-io/add-stage-2-solutions

Add 02-rg2

solutions/python/02-rg2/code/.codecrafters/compile.sh

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+#!/bin/sh
+#
+# This script is used to compile your program on CodeCrafters
+#
+# This runs before .codecrafters/run.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+# (This file is empty since Python programs don't use a compile step)

solutions/python/02-rg2/code/.codecrafters/run.sh

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+#!/bin/sh
+#
+# This script is used to run your program on CodeCrafters
+#
+# This runs after .codecrafters/compile.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+exec python3 -m app.main "$@"

solutions/python/02-rg2/code/.gitattributes

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+* text=auto

solutions/python/02-rg2/code/.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/

solutions/python/02-rg2/code/README.md

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+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/redis.png)
+
+This is a starting point for Python solutions to the
+["Build Your Own Redis" Challenge](https://codecrafters.io/challenges/redis).
+
+In this challenge, you'll build a toy Redis clone that's capable of handling
+basic commands like `PING`, `SET` and `GET`. Along the way we'll learn about
+event loops, the Redis protocol and more.
+
+**Note**: If you're viewing this repo on GitHub, head over to
+[codecrafters.io](https://codecrafters.io) to try the challenge.
+
+# Passing the first stage
+
+The entry point for your Redis implementation is in `app/main.py`. Study and
+uncomment the relevant code, and push your changes to pass the first stage:
+
+```sh
+git commit -am "pass 1st stage" # any msg
+git push origin master
+```
+
+That's all!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `python (3.x)` installed locally
+1. Run `./your_program.sh` to run your Redis server, which is implemented in
+   `app/main.py`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.
+
+# Troubleshooting
+
+## module `socket` has no attribute `create_server`
+
+When running your server locally, you might see an error like this:
+
+```
+Traceback (most recent call last):
+  File "/.../python3.7/runpy.py", line 193, in _run_module_as_main
+    "__main__", mod_spec)
+  File "/.../python3.7/runpy.py", line 85, in _run_code
+    exec(code, run_globals)
+  File "/app/app/main.py", line 11, in <module>
+    main()
+  File "/app/app/main.py", line 6, in main
+    s = socket.create_server(("localhost", 6379), reuse_port=True)
+AttributeError: module 'socket' has no attribute 'create_server'
+```
+
+This is because `socket.create_server` was introduced in Python 3.8, and you
+might be running an older version.
+
+You can fix this by installing Python 3.8 locally and using that.
+
+If you'd like to use a different version of Python, change the `language_pack`
+value in `codecrafters.yml`.

solutions/python/02-rg2/code/app/main.py

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+import socket  # noqa: F401
+
+
+def main():
+    server_socket = socket.create_server(("localhost", 6379), reuse_port=True)
+    connection, _ = server_socket.accept()
+    connection.sendall(b"+PONG\r\n")
+
+
+if __name__ == "__main__":
+    main()

solutions/python/02-rg2/code/codecrafters.yml

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+# Set this to true if you want debug logs.
+#
+# These can be VERY verbose, so we suggest turning them off
+# unless you really need them.
+debug: false
+
+# Use this to change the Python version used to run your code
+# on Codecrafters.
+#
+# Available versions: python-3.12
+language_pack: python-3.12

solutions/python/02-rg2/code/your_program.sh

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+#!/bin/sh
+#
+# Use this script to run your program LOCALLY.
+#
+# Note: Changing this script WILL NOT affect how CodeCrafters runs your program.
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit early if any commands fail
+
+# Copied from .codecrafters/run.sh
+#
+# - Edit this to change how your program runs locally
+# - Edit .codecrafters/run.sh to change how your program runs remotely
+exec python3 -m app.main "$@"

solutions/python/02-rg2/diff/app/main.py.diff

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+@@ -1,10 +1,11 @@
+ import socket  # noqa: F401
+
+
+ def main():
+     server_socket = socket.create_server(("localhost", 6379), reuse_port=True)
+-    server_socket.accept() # wait for client
++    connection, _ = server_socket.accept()
++    connection.sendall(b"+PONG\r\n")
+
+
+ if __name__ == "__main__":
+     main()