Pynotify2 is - or was - a package to display desktop notifications on Linux. Those are the little bubbles which tell a user about e.g. new emails.

Pynotify2 is deprecated. Here are some alternatives:

• desktop_notify is a newer module doing essentially the same thing.
• If you're writing a GTK application, you may want to use GNotification (intro, Python API)
• For simple cases, you can run notify-send as a subprocess. The py-notifier package provides a simple Python API around this, and can also display notifications on Windows.