What is the use of -U in the pip install command?

Question

What is the use of -U in this install command?

pip install -U scikit-learn

score 3 · Accepted Answer · answered May 11 '18 at 13:23

This option upgrades all packages. From man pip/INSTALL OPTIONS:

-U, --upgrade
          Upgrade all packages to  the  newest  available  version.   This
          process  is  recursive  regardless  of  whether  a dependency is
          already satisfied.

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What is the use of -U in the pip install command?

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