bidict
Efficient bidirectional map data structures for Python.
Pricing
Free tier
Flat rate
Adoption
→StableLicense
Open Source
Data freshness
Verified · Jul 12, 2026Overview
What is bidict?
Bidict provides efficient and Pythonic bidirectional mapping capabilities, allowing developers to maintain consistent mappings between two sets of values. This is particularly useful in scenarios where reverse lookups are required without the overhead of maintaining separate dictionaries.
Key differentiator
“Bidict stands out as an efficient, Pythonic solution for implementing bidirectional mappings with minimal overhead and comprehensive support for various use cases.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
Bidict is primarily designed for Python, and there are no official versions or integrations for other programming languages.
Setting up bidirectional mappings with complex data structures can require a deep understanding of the library's internal mechanisms and Pythonic patterns.
Maintaining two-way consistency between mappings can introduce performance bottlenecks when dealing with very large datasets or high-frequency updates.
While the basic documentation is comprehensive, it falls short in providing detailed examples for more complex use cases and edge scenarios.
Fit analysis
Who is it for?
✓ Best for
Developers working on projects requiring efficient bidirectional data structures.
Applications where reverse lookups need to be performed frequently and efficiently.
✕ Not a fit for
Projects that do not require bidirectional mapping capabilities.
Scenarios where the overhead of maintaining a bidirectional map is unnecessary or inefficient.
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Works well with
Integrations
Next step
Get Started with bidict
Step-by-step setup guide with code examples and common gotchas.