How to downgrade Pandas Version

Question

I'm using python 3.x in my windows 7. The pandas version in my system is 0.20.3. As per my project requirement, I need to install Pandas version 0.19.2 Can you suggest me how to do that?

I also tried to install it using anaconda prompt & I got following message given in screen shot

Answer 1

Assuming pandas was installed with pip, you can simply redo the install with the desired version. If it was installed by some other method, the below may not work.

In a command terminal:

pip install pandas==0.19.2

In the output, you should see mention of the previous version being uninstalled.

Answer 2

There's an incompatibility version between pandas and your blaze package. It also does not have a fixed version, so the incompatibility can appear any time.

You can downgrade two packages at once:

conda install pandas==0.25 python==3.7

I'd uninstall blaze, downgrade pandas and try to reinstall blaze again.

It is always a good practice to fix your package versions and commit them to your version control. Use this command:

conda env export -f environment.yml

It will save every version of your pandas and pip packages. Add it to your version control.

BTW, I prefer to export using the option --from-history. It will export just the libs you explicitly installed, and not the dependencies:

conda env export --from-history > environment.yml

It will prevent a lot of troubles.

Note: for --from-history to work fine, you must have fixed your package version when installing packages: conda install pandas==0.25. Do not install without a version number: conda install pandas