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You can then do './scripts/python -m venv /path/to/venv' to create a virtual env based on the bundled Python, which can be handy if you don't happen to have the appropriate version of Python installed separately.
To achieve reproducible builds we use pip-tools to lock packages to a particular version. Sadly this is complicated by the fact that Python can only tell us which transitive dependencies are required by actually installing packages, and if you run pip-tools on a Mac or Linux machine, it will miss packages that are required on Windows and vice versa.
So we're stuck manually merging dependencies for now. To update deps:
- run 'bazel run update' to update requirements.txt for the current platform
- consult the git diff, and manually merge the changes, undoing the removal of items pinned on other platforms
- repeat the process on the other platform
- run the tests to ensure nothing has broken on either platform
- commit the changes to requirements.txt
At the time of writing, Macs and Linux machines have identical output - it is only Windows that differs. But we should not assume that will always be the case.