You should not install pip in Sage since pip is a standard package already. To install a pip package within Sage, for example octave_kernel, you just have to do:
sage -pip install octave_kernel

You should not install pipcan have a look at in Sage since pip is a standard package already. To install a pip package within Sage, for example octave_kernel, you just have to do:https://ask.sagemath.org/question/51130/ssl-error-using-sage-pip-install-to-download-a-package/
sage -pip install octave_kernel