How to contribute

Contributions are welcome, and they are greatly appreciated! Every little bit helps, and credit will always be given.

You can report bugs at https://github.com/zfit/zfit/issues.
You can send feedback by filing an issue at https://github.com/zfit/zfit/issues or, for more informal discussions, you can also join our Gitter channel.

Get Started!

Ready to contribute? Here's how to set up zfit for local development.

Clone your fork locally:

$ git clone git@github.com:your_name_here/zfit.git

Install your local copy into a virtualenv. Assuming you have virtualenvwrapper installed, this is how you set up your fork for local development:
```
$ mkvirtualenv zfit
$ cd zfit/
$ pip install -e .[alldev]  # (or [dev] if this fails)
```
Create a branch for local development:
```
$ git checkout -b name-of-your-bugfix-or-feature
```
Now you can make your changes locally.
When you're done making changes, check that your changes pass the tests (this can take a while ~30 mins):
```
$ pytest
```

Commit your changes and push your branch to GitHub:

$ git add .
$ git commit -m "Your detailed description of your changes."
$ git push origin name-of-your-bugfix-or-feature

Submit a pull request through the GitHub website. The test suite is going to run again, testing all the necessary Python versions.

Before you submit a pull request, check that it meets these guidelines:

The pull request should include tests.
If the pull request adds functionality, the docs may need to be updated. Put your new functionality into a function with a docstring (and add the necessary explanations in the corresponding rst file in the docs). If any math is involved, please document the exact formulae implemented in the docstring/docs.
The pull request should work for all Python versions. Check https://travis-ci.org/zfit/zfit/pull_requests and make sure that the tests pass for all supported Python versions.