Fluent, fully typed assertion library for Python: your type checker sees only the assertions that fit the value, and every failure carries a structured diff. Soft assertions, polling, inline snapshots, OpenAPI contracts.
Typed successor to docopt: the usage message is the parser spec.
Simple assertion library for unit testing in python with a fluent API
Anthropic, PBC
Visionary sponsor
Bloomberg
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Hudson River Trading
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Meta
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NVIDIA
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Microsoft
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Depot
Continuous Integration
AWS
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Datadog
Monitoring
Fastly
CDN
Google
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Sentry
Error logging
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