Solve the pip upgrade problem

pip show pip has the following problems

• WARNING: pip is being invoked by an old script wrapper. This will fail in a future version of pip. Please see
  https://github.com/pypa/pip/issues/5599 for advice on fixing the
  underlying issue. To avoid this problem you can invoke Python with
  ‘-m pip’ instead of running pip directly

Delete directly

• python -m pip uninstall pip

Update

• pip install --upgrade pip