mypy
Optional static type checker for Python — catches type errors before runtime by analysing type annotations, with support for gradual typing
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Black
The uncompromising Python code formatter — produces consistent output with no configuration debates, adopted as the de facto standard by most major projects
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Click
Composable command-line interface toolkit from the Pallets team — creates CLIs with minimal boilerplate using decorators, used by Flask, pip, and countless tools
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HTTPX
A modern, async-capable HTTP client for Python — the natural successor to Requests with full HTTP/2 support
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