How can we define a project's root directory?

Question

For example, givensrc/my_proj/processors/simple_processor.py
notebooks/nb1.py I'd like to set the project root as src/proj and, from notebook nb1.py, importfrom processors.simple_processor import SimpleProcessor

MontyCarleau · Answer

If the answer is to modify sys.path at the beginning of every notebook, that's fine, but some tools expect/allow base directories to be specified in pyproject.toml

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How can we define a project's root directory?