Ana,

The error in "piperroroutput.txt" points to the issue Mark mentioned in msg351131: the current release of Numpy is not compatible with Python 3.8, but the tip of the tree on GitHub is.

I can install Numpy from the repository:

$ python --version
Python 3.8.0b4

$ pip install git+https://github.com/numpy/numpy.git
Collecting git+https://github.com/numpy/numpy.git
  Cloning https://github.com/numpy/numpy.git to /private/var/folders/dy/5fl45b9s61x84g7k_18618vc0000gn/T/pip-req-build-b3_tnmd0
  Running command git clone -q https://github.com/numpy/numpy.git /private/var/folders/dy/5fl45b9s61x84g7k_18618vc0000gn/T/pip-req-build-b3_tnmd0
  Running command git submodule update --init --recursive -q
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
Building wheels for collected packages: numpy
  Building wheel for numpy (PEP 517) ... done
  Created wheel for numpy: filename=numpy-1.18.0.dev0+3883be3-cp38-cp38-macosx_10_9_x86_64.whl size=4534619 sha256=005a0085f7dcca60b138b0ed01c72977fa0777e4ef1e0693a84295b663ef1178
  Stored in directory: /private/var/folders/dy/5fl45b9s61x84g7k_18618vc0000gn/T/pip-ephem-wheel-cache-f8wuhnns/wheels/08/c9/f0/5fb73d652a67220580b707eb5b66bfcccf521160a016ae6f2e
Successfully built numpy
Installing collected packages: numpy
Successfully installed numpy-1.18.0.dev0+3883be3

I propose closing this issue as a 3th-party issue. This should resolve itself with the next release of Numpy.