jab/bidict

Health v2 · maintenance only

Adoption not part of the score

1586 stars · 69 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

bidict is a Python library providing efficient, type-hinted bidirectional mapping data structures where both keys and values can be looked up. It offers Pythonic dict-like APIs with an .inverse property, is dependency-free, and has been maintained since 2009.

Use cases

• maintain a two-way lookup between ids and names in Python
• map enum values to labels and back
• invert a dictionary efficiently while keeping both directions in sync
• look up keys by value like a reverse dict
• store symbol-to-element and element-to-symbol mappings
• enforce one-to-one relationships between two sets of values

When to choose

• you need both key->value and value->key lookups kept automatically in sync
• you want a mature, well-tested, zero-dependency Python library
• you need type-hinted, dict-like APIs with safety guarantees against duplicate values

When to avoid

• you only need a one-time inversion of a dict (use {v: k for k, v in d.items()})
• your mappings are not one-to-one and you need multi-mapping semantics
• you are not working in Python

Facets

library · maturity stable

serialization developer-tools python cross-platform bidirectional-map bimap data-structures dictionary collections algorithms

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