Simon Willison • 8/31/2026

Introducing wrapture

This article introduces wrapture, a new Python library by Graham Dumpleton (creator of wrapt and mod_wsgi) that extends monkeypatching to testing and tracing. It allows wrapping any function or method for tracing or overriding return values, serving as an alternative to unittest.mock and a tool for observing code you don't control. Wrapture includes OpenTelemetry support and a configuration-based mechanism for adding tracing to existing projects. The article also discusses its origin as an AI-assisted project and provides examples of its testing patterns, such as stubbing and modifying return values.

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#Python #testing #tracing