using pip install -u when downloading packages

[reiase]

I was originally going to do this but then I didnt because using -u will mess up if the user is using a virtual_env

Originally posted by @filip-halt in #1269 (comment)

[reiase]

When installing packages with pip, we should consider --user option if the user is using a system python, but we should install the package without --user option if the user is using a virtual env.

We need to discuss the detail behavior of package install. @GuoRentong @junjiejiangjjj @fzliu @filip-halt

[GuoRentong]

When installing packages with pip, we should consider --user option if the user is using a system python, but we should install the package without --user option if the user is using a virtual env.

We need to discuss the detail behavior of package install. @GuoRentong @junjiejiangjjj @fzliu @filip-halt

we can provide such control flexibility via environment variables

[reiase]

When installing packages with pip, we should consider --user option if the user is using a system python, but we should install the package without --user option if the user is using a virtual env.
We need to discuss the detail behavior of package install. @GuoRentong @junjiejiangjjj @fzliu @filip-halt

we can provide such control flexibility via environment variables

does the user have to restart ipython kernel when he is using jupyter notebook to set the environment variables?

[stale]

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