pip requirements.txt with alternative index
Solution 1:
requirements.txt:
-i http://dist.repoze.org/zope2/2.10/simple
zopelib
Example:
$ pip install -r requirements.txt
...
Successfully installed zopelib
Solution 2:
Add an extra index location to the requirements file just before the package/project name:
--extra-index-url <Extra URLs other than index-url>
<some_project_name>
Alternatively, you may use -i or --index-url <Base URL of the Python Package Index>.
Refer: requirements file format