# Development

If you want to contribute anything to parso, just open an issue or pull request to discuss it. We welcome changes! Please check the `CONTRIBUTING.md` file in the repository, first.

## Deprecations Process

The deprecation process is as follows:

1. A deprecation is announced in the next major/minor release.
2. We wait either at least a year & at least two minor releases until we remove the deprecated functionality.

## Testing

The test suite depends on `tox` and `pytest`:

    pip install tox pytest

To run the tests for all supported Python versions:

    tox

If you want to test only a specific Python version (e.g. Python 2.7), it’s as easy as:

    tox -e py27

Tests are also run automatically on Travis CI.