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Fix pip environment resolution#798
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Calling `pip install` multiple times can (deeply unfortunately) allow an environment to become out-of-sync; `pip` doesn't "remember" the constraints of previous installation commands. One of the largest effects here is that doing `pip install -e .` _followed_ by `pip install git+<qiskit>@main` installs `qiskit-terra` from the initial installation (via `qiskit==0.45.2`), then installs `qiskit==1.0.0.dev0` from Git, which is an incompatible environment. Doing the whole environment resolution in a single `pip install` command fixes this, as the `qiskit` dependency is correctly resolved to be _only_ the `1.0.0.dev0` version.
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kt474
approved these changes
Jan 22, 2024
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Summary
Calling
pip installmultiple times can (deeply unfortunately) allow an environment to become out-of-sync;pipdoesn't "remember" the constraints of previous installation commands.One of the largest effects here is that doing
pip install -e .followed bypip install git+<qiskit>@maininstallsqiskit-terrafrom the initial installation (viaqiskit==0.45.2), then installsqiskit==1.0.0.dev0from Git, which is an incompatible environment. Doing the whole environment resolution in a singlepip installcommand fixes this, as theqiskitdependency is correctly resolved to be only the1.0.0.dev0version.Details and comments