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The bidirectional mapping library for Python.

Project description

The bidirectional mapping library for Python.

bidict logo

Status

Latest release Documentation Travis-CI build status Test coverage License Downloads past month

Bidict:

  • has been used for many years by several teams at Google, Venmo, CERN, Bank of America Merrill Lynch, Bloomberg, Two Sigma, and others
  • has carefully designed APIs for safety, simplicity, flexibility, and ergonomics
  • is fast, lightweight, and has no runtime dependencies other than Python’s standard library
  • integrates natively with Python’s collections interfaces
  • is implemented in concise, well-factored, pure (PyPy-compatible) Python code optimized both for reading and learning from [1] as well as for running efficiently
  • has extensive docs and test coverage (including property-based tests and benchmarks) run continuously on all supported Python versions and OSes

Note: Python 3 Now Required

As promised in the 0.18.2 release (see changelog [2]), Python 2 is no longer supported. Version 0.18.3 is the last release of bidict that supports Python 2. This makes bidict more efficient on Python 3 and enables further improvement to bidict in the future. See python3statement.org for more info.

Installation

pip install bidict

Quick Start

>>> from bidict import bidict
>>> element_by_symbol = bidict({'H': 'hydrogen'})
>>> element_by_symbol['H']
'hydrogen'
>>> element_by_symbol.inverse['hydrogen']
'H'

For more usage documentation, head to the intro [3] and proceed from there.

Community Support

Chat

If you are thinking of using bidict in your work, or if you have any questions, comments, or suggestions, I’d love to know about your use case and provide as much voluntary support for it as possible.

Please feel free to leave a message in the chatroom or open a new issue on GitHub. You can search through existing issues before creating a new one in case your questions or concerns have been adressed there already.

Notice of Usage

If you use bidict, and especially if your usage or your organization is significant in some way, please let me know.

You can:

Changelog

See the changelog [2] for a history of notable changes to bidict.

Release Notifications

Follow on libraries.io

Subscribe to bidict releases on libraries.io to be notified when new versions of bidict are released. Alternatively, on GitHub, click “Watch” and choose “Releases”.

Learning from bidict

One of the most rewarding things about bidict is the outsized amount of advanced Python it covers in light of its small codebase.

Check out learning-from-bidict [1] if you’re interested in learning more.

Contributing

Bidict is currently a one-person operation maintained on a voluntary basis with no other sponsorship. Your help would be most welcome!

Reviewers Wanted!

One of the most valuable ways to contribute to bidict and to explore some advanced Python [1] while you’re at it is to review bidict’s relatively small codebase.

Please create an issue or pull request with any improvements you’d propose or any other results you found. (Submitting a “Nothing-to-merge” PR with feedback in inline code comments or a Review results issue both work well.)

You can also +1 this issue to sign up to give feedback on future proposed changes that are in need of a reviewer.

Giving Back

Bidict is the product of hundreds of hours of unpaid, voluntary work.

If bidict has helped you accomplish your work, especially work you’ve been paid for, please consider chipping in toward the costs of bidict’s maintenance and development and/or ask your organization to do the same.

Support bidict

Finding Documentation

If you’re viewing this on https://bidict.readthedocs.io, note that multiple versions of the documentation are available, and you can choose a different version using the popup menu at the bottom-right. Please make sure you’re viewing the version of the documentation that corresponds to the version of bidict you’d like to use.

If you’re viewing this on GitHub, PyPI, or some other place that can’t render and link this documentation properly and are seeing broken links, try these alternate links instead:

[1](1, 2, 3) docs/learning-from-bidict.rst | https://bidict.readthedocs.io/learning-from-bidict.html
[2](1, 2) CHANGELOG.rst | https://bidict.readthedocs.io/changelog.html
[3](1, 2) docs/intro.rst | https://bidict.readthedocs.io/intro.html

Next: intro [3]

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