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Previously, when a user or a command line tool (let's call it a "frontend")
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would call "setup.py egg_info" or "setup.py bdist_wheel" on the command line.
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- `build_wheel`: build a wheel in the folder and return the basename
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- `prepare_metadata_for_build_wheel`: get the `install_requires`
- `build_sdist`: build an sdist in the folder and return the basename
- `get_requires_for_build_sdist`: get the `setup_requires` to build
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