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Bidict is the bidirectional mapping library for Python, depended on by Google, Venmo, CERN, Baidu, Tencent, and teams across the world since 2009. It has familiar, Pythonic APIs that are carefully designed for safety, simplicity, flexibility, and ergonomics; is lightweight, with no runtime dependencies other than Python’s standard library; is implemented in concise, well-factored, fully type-hinted Python code that is optimized for running efficiently as well as for long-term maintenance and stability; provides extensive documentation; and has 100% test coverage running continuously across all supported Python versions.