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CONTRIBUTING.md

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+# Contributing
+
+## Introduction
+
+First off, thank you for considering contributing to redis-py. We value
+community contributions!
+
+## Contributions We Need
+
+You may already know what you want to contribute \-- a fix for a bug you
+encountered, or a new feature your team wants to use.
+
+If you don\'t know what to contribute, keep an open mind! Improving
+documentation, bug triaging, and writing tutorials are all examples of
+helpful contributions that mean less work for you.
+
+## Your First Contribution
+
+Unsure where to begin contributing? You can start by looking through
+[help-wanted
+issues](https://github.com/andymccurdy/redis-py/issues?q=is%3Aopen+is%3Aissue+label%3ahelp-wanted).
+
+Never contributed to open source before? Here are a couple of friendly
+tutorials:
+
+-   <http://makeapullrequest.com/>
+-   <http://www.firsttimersonly.com/>
+
+## Getting Started
+
+Here\'s how to get started with your code contribution:
+
+1.  Create your own fork of redis-py
+2.  Do the changes in your fork
+3.  
+    *Create a virtualenv and install the development dependencies from the dev_requirements.txt file:*
+
+        a.  python -m venv .venv
+        b.  source .venv/bin/activate
+        c.  pip install -r dev_requirements.txt
+
+4.  If you need a development environment, run `invoke devenv`
+5.  While developing, make sure the tests pass by running `invoke tests`
+6.  If you like the change and think the project could use it, send a
+    pull request
+
+To see what else is part of the automation, run `invoke -l`
+
+## The Development Environment
+
+Running `invoke devenv` installs the development dependencies specified
+in the dev_requirements.txt. It starts all of the dockers used by this
+project, and leaves them running. These can be easily cleaned up with
+`invoke clean`. NOTE: it is assumed that the user running these tests,
+can execute docker and its various commands.
+
+-   A master Redis node
+-   A Redis replica node
+-   Three sentinel Redis nodes
+-   A multi-python docker, with your source code mounted in /data
+
+The replica node, is a replica of the master node, using the
+[leader-follower replication](https://redis.io/topics/replication)
+feature.
+
+The sentinels monitor the master node in a [sentinel high-availability
+configuration](https://redis.io/topics/sentinel).
+
+## Testing
+
+Each run of tox starts and stops the various dockers required. Sometimes
+things get stuck, an `invoke clean` can help.
+
+Continuous Integration uses these same wrappers to run all of these
+tests against multiple versions of python. Feel free to test your
+changes against all the python versions supported, as declared by the
+tox.ini file (eg: tox -e py39). If you have the various python versions
+on your desktop, you can run *tox* by itself, to test all supported
+versions. Alternatively, as your source code is mounted in the
+**lots-of-pythons** docker, you can start exploring from there, with all
+supported python versions!
+
+### Docker Tips
+
+Following are a few tips that can help you work with the Docker-based
+development environment.
+
+To get a bash shell inside of a container:
+
+`$ docker run -it <service> /bin/bash`
+
+**Note**: The term \"service\" refers to the \"services\" defined in the
+`tox.ini` file at the top of the repo: \"master\", \"replicaof\",
+\"sentinel_1\", \"sentinel_2\", \"sentinel_3\".
+
+Containers run a minimal Debian image that probably lacks tools you want
+to use. To install packages, first get a bash session (see previous tip)
+and then run:
+
+`$ apt update && apt install <package>`
+
+You can see the logging output of a containers like this:
+
+`$ docker logs -f <service>`
+
+The command make test runs all tests in all tested Python
+environments. To run the tests in a single environment, like Python 3.6,
+use a command like this:
+
+`$ docker-compose run test tox -e py36 -- --redis-url=redis://master:6379/9`
+
+Here, the flag `-e py36` runs tests against the Python 3.6 tox
+environment. And note from the example that whenever you run tests like
+this, instead of using make test, you need to pass
+`-- --redis-url=redis://master:6379/9`. This points the tests at the
+\"master\" container.
+
+Our test suite uses `pytest`. You can run a specific test suite against
+a specific Python version like this:
+
+`$ docker-compose run test tox -e py36 -- --redis-url=redis://master:6379/9 tests/test_commands.py`
+
+### Troubleshooting
+
+If you get any errors when running `make dev` or `make test`, make sure
+that you are using supported versions of Docker.
+
+Please try at least versions of Docker.
+
+-   Docker 19.03.12
+
+## How to Report a Bug
+
+### Security Vulnerabilities
+
+**NOTE**: If you find a security vulnerability, do NOT open an issue.
+Email Andy McCurdy (<sedrik@gmail.com>) instead.
+
+In order to determine whether you are dealing with a security issue, ask
+yourself these two questions:
+
+-   Can I access something that\'s not mine, or something I shouldn\'t
+    have access to?
+-   Can I disable something for other people?
+
+If the answer to either of those two questions are \"yes\", then you\'re
+probably dealing with a security issue. Note that even if you answer
+\"no\" to both questions, you may still be dealing with a security
+issue, so if you\'re unsure, just email Andy at <sedrik@gmail.com>.
+
+### Everything Else
+
+When filing an issue, make sure to answer these five questions:
+
+1.  What version of redis-py are you using?
+2.  What version of redis are you using?
+3.  What did you do?
+4.  What did you expect to see?
+5.  What did you see instead?
+
+## How to Suggest a Feature or Enhancement
+
+If you\'d like to contribute a new feature, make sure you check our
+issue list to see if someone has already proposed it. Work may already
+be under way on the feature you want \-- or we may have rejected a
+feature like it already.
+
+If you don\'t see anything, open a new issue that describes the feature
+you would like and how it should work.
+
+## Code Review Process
+
+The core team looks at Pull Requests on a regular basis. We will give
+feedback as as soon as possible. After feedback, we expect a response
+within two weeks. After that time, we may close your PR if it isn\'t
+showing any activity.