ailed with error code 1 in /tmp/pip-build-xliff5do/grpcio/ code example

Example 1: failed with error code 1 in /tmp/pip-build-xxzumppm/grpcio/

$ pip3 install --upgrade setuptools
$ pip3 install --upgrade pip

Example 2: failed with error code 1 in /tmp/pip-build-ntwLiA/opencv-python/

sudo python3 -m pip install -U pip
sudo python3 -m pip install -U setuptools