can't install pandas (ERROR: Cannot uninstall 'numpy')
I tried the solutions presented in the other answers, but what worked for me was installing pandas using conda.
I'm on macOS 10.15 Beta, running a .py script that requires pandas, which is not installed.
When I run sudo python -m pip install --upgrade pandas I receive:

ERROR: Cannot uninstall 'numpy'. It is a distutils installed project
  and thus we cannot accurately determine which files belong to it which
  would lead to only a partial uninstall.

If I run sudo pip install pandas I receive the same error.
Help appreciated.