From the error message, it looks like it could not build wheel for the rpy2 package. You can try conda instead of pip; it should install the rpy2 package.
If you have not installed Miniconda or Anaconda on your system, you can download and install it from the Anaconda's website. Once Miniconda or Anaconda is installed, install rpy2 using the following command:
conda install -c conda-forge rpy2