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�S )aB Load the pyproject.toml file.
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use_pep517 - Has the user requested PEP 517 processing? None
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pyproject_toml - Location of the project's pyproject.toml file
setup_py - Location of the project's setup.py file
req_name - The name of the requirement we're processing (for
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None if we should use the legacy code path, otherwise a tuple
(
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name of PEP 517 backend,
requirements we should check are installed after setting
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directory paths to import the backend from (backend-path),
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