How to tell package manager (pip) to never replace newer with older version

Question

Is there a way to tell the package manager pip to never replace newer by older versions when installing packages from a requirements.txt ?

Example: I have Robot Framework 3.2.2 and Waitress 1.4.3 installed and my requirements.txt looks like this:

...
robotframework==3.0.2
waitress==1.4.4
...

Hence, I would only want the waitress requirement to be refreshed. The reason is that I need to automate the installation of dependencies via requirement files and can't just change their content.

Answer 1

You could use >= to tell pip to install newer versions, or that version.

For example:

robotframework>=3.0.2
waitress>=1.4.4

Would tell pip to install any version that is at least 3.0.2 for robotframework, and at least 1.4.4 for waitress.