The shortest code to run a jupyter notebook and retrieve the output from all cells.

nbRunner.py

import argparse
import nbclient
import nbformat
import nbparameterise
import sys
old_stdout = sys.stdout

parser = argparse.ArgumentParser(
    description='Notebook Runner'
)
parser.add_argument('Notebook')
args, unknown = parser.parse_known_args()

with open(args.Notebook, 'rb') as f:
    nb = nbformat.read(f, as_version=4)

notebook_params = nbparameterise.extract_parameters(nb)

parser = argparse.ArgumentParser()
for item in notebook_params:
    parser.add_argument(f'--{item.name}')
args, unknown = parser.parse_known_args()

new_params = nbparameterise.parameter_values(old_params,**vars(args))
new_nb = nbparameterise.replace_definitions(nb, new_params)

output = nbclient.execute(new_nb)
sys.stdout = old_stdout
for item in output['cells']:
    for o in item['outputs']:
        print(o['text'].strip())