Version pinning forces the build to retrieve a particular version regardless of what’s in the cache. This technique can also reduce failures due to unanticipated changes in required packages. You can read more about version pinning here.

Bad Practice

FROM python:3.4
RUN pip install django
RUN pip install https://github.com/Banno/carbon/tarball/0.9.x-fix-events-callback

Recommended

FROM python:3.4
RUN pip install django==1.9
RUN pip install git+https://github.com/Banno/carbon@0.9.15

References

You can also specify the requirements in a text file and pass it to pip as shown here.

srijan-deepsource / readthedocs.org

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