Using “-t” option inside a requirements.txt file

Question

When I have, for example, a requirements-dev.txt and a requirements.txt, I know I can have -r requirements.txt inside requirements-d

Answer 1

As of today (in pip version 20.0.2), the -t, --target <dir> option is not supported in requirements.txt files. The section "Requirements File Format" of pip's User guide lists the currently supported options:

• -i, --index-url
• --extra-index-url
• --no-index
• -c, --constraint
• -r, --requirement
• -e, --editable
• -f, --find-links
• --no-binary
• --only-binary
• --require-hashes
• --pre
• --trusted-host

Answer 2

pip install -r requirements.txt -t /path/to/install

This should work. It worked for me.

If you want different modules to be installed to different locations, then I think you might have to put them into multiple requirements text files. This is at least as far as I know