Hello Python developers!

I'm looking to deploy Python 3 silently to the Macs that I manage, so I can use Python for various scripts. I'm using Munki to accomplish this. However, the Python_Documentation.pkg subpackage includes this code in the postinstall script:

```
# make link in /Applications/Python m.n/ for Finder users
if [ -d "${APPDIR}" ]; then
    ln -fhs "${FWK_DOCDIR}/index.html" "${APPDIR}/Python Documentation.html"
    open "${APPDIR}" || true  # open the applications folder
fi
```

Would it be possible to test for the $COMMAND_LINE_INSTALL variable before opening a Finder window? If the $COMMAND_LINE_INSTALL exists, it'd be really great if it didn't open the Finder. This would allow me to silently deploy Python 3 without disrupting my users.

Thanks!

Mike