By default it prefers packages at micropython.org-s index. If the package or the required version is not found there, then it turns to PyPI.
The same tool is behind the MicroPython/CircuitPython package manager of the just-released Thonny 3.3.10.
Autodependencies
You can give a requirements.txt to minipip and if a package has requirements, they are taken care of. It’s just that version resolution for upip-compatible packages is not as advanced as in the newest pip versions. If the package has pip-compatible assets, then pip takes care of everything.
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Python for Microcontrollers – Adafruit Daily — Python on Microcontrollers Newsletter: A New Arduino MicroPython Package Manager, How-Tos and Much More! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi
EYE on NPI – Adafruit Daily — EYE on NPI Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey