The following Python packages provide functionality widely usable by packages across the ecosystem. Also see to the Scientific Python Developer Guide.
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Implements lazy loading as described in SPEC1. 
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Scientific Python Developer Incantations: an extendible tool that provides uniform aliases for build tasks across the ecosystem ( spin build,spin docs, etc.).
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A plugin for the pytest framework that provides advanced doctest support and enables the testing of text file formats. 
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A framework for building checks designed to check to see if a repository follows guideline. 
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A tool for automating release notes.