[rshanor]

click is listed as the optional cli extra, but the s7 console script is always installed. On a plain pip install python-snap7, running s7 fails with an ImportError traceback from snap7.cli. Downstream packagers, such as the conda-forge recipe being added, then have to make click a hard dependency to keep the installed script working.

This points the s7 entry point at a small wrapper, snap7._console:main. The wrapper checks for click before importing snap7.cli:

• Without click, s7 prints Install them with: pip install python-snap7[cli] to stderr and exits with status 1.
• With click, behaviour is unchanged.

snap7.cli itself is unchanged, so from snap7.cli import main and python -m snap7.cli work as before.

Testing

• New tests/test_console.py covers both paths: click missing, and click present.
• Manual check in a fresh venv with pip install . (no click): s7 --help prints the hint and exits 1. With [cli] installed it shows the normal help.
• uv run pre-commit run --all-files passes, including mypy and ruff.
• pytest -m "server or util or client or mainloop": all pass except test_get_pg_block_info. That test also fails on unmodified master when run in a US timezone (b'2019/06/26' != b'2019/06/27') and passes with TZ=UTC, so it is unrelated to this change.