libpebble2 is a python library for interacting with Pebble devices. It:

• Supports connections to Pebble QEMU instances and to watches via the Pebble mobile app or Bluetooth serial.
• Supports connection to watches running both 2.x and 3.x firmware on aplite or basalt hardware
• Provides automatic serialisation and deserialisation of pebble protocol messages
• Asynchronous information is provided by a usable event system
• Features a simple DSL for defining new message types
• Provides ready-made implementations several Pebble Protocol services, including BlobDB and app installation
• Works on Python 2.7 and 3.4

pip install libpebble2

Or, grab the source from https://github.com/pebble/libpebble2 and:

python setup.py install

Over here!