>>
Traceback (most recent call last):
  File "bin/setup_db.py", line 21, in <module>
    engine = create_engine(f"mysql://{db_user}:{db_pass}@{db_host}:{db_port}/{db_name}")
  File "/root/.local/share/virtualenvs/apollo-rQZt5yVe/lib/python3.6/site-packages/sqlalchemy/engine/__init__.py", line 479, in create_engine
    return strategy.create(*args, **kwargs)
  File "/root/.local/share/virtualenvs/apollo-rQZt5yVe/lib/python3.6/site-packages/sqlalchemy/engine/strategies.py", line 54, in create
    u = url.make_url(name_or_url)
  File "/root/.local/share/virtualenvs/apollo-rQZt5yVe/lib/python3.6/site-packages/sqlalchemy/engine/url.py", line 229, in make_url
    return _parse_rfc1738_args(name_or_url)
  File "/root/.local/share/virtualenvs/apollo-rQZt5yVe/lib/python3.6/site-packages/sqlalchemy/engine/url.py", line 288, in _parse_rfc1738_args
    return URL(name, **components)
  File "/root/.local/share/virtualenvs/apollo-rQZt5yVe/lib/python3.6/site-packages/sqlalchemy/engine/url.py", line 71, in __init__
    self.port = int(port)
ValueError: invalid literal for int() with base 10: 'None'