Why Python Needs pyproject.toml: Understanding Build System Dependencies

PEP 518 introduces a declarative pyproject.toml file that lets Python projects explicitly declare build‑system dependencies, solving the paradox of needing to run setup.py to discover its own requirements and enabling tools like pip to ensure necessary packages are installed before building.

Build SystemPEP 518packaging

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Why Python Needs pyproject.toml: Understanding Build System Dependencies