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Add docstring to emphasise laziness
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"""Utilities to lazily create and visit candidates found.
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Creating and visiting a candidate is a *very* costly operation. It involves
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fetching, extracting, potentially building modules from source, and verifying
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distribution metadata. It is therefore crucial for performance to keep
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everything here lazy all the way down, so we only touch candidates that we
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absolutely need, and not "download the world" when we only need one version of
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something.
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"""
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import functools
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import itertools
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