https://pypi.python.org/pypi/pyOSC/0.3.5b-5294

installation:

<del>  $ sudo pip install pyosc</del>\\
$ wget https://pypi.python.org/packages/source/p/pyOSC/pyOSC-0.3.5b-5294.tar.gz
$ tar -xvf pyOSC-0.3.5b-5294.tar.gz
$ cd pyOSC-0.3.5b-5294/
$ sudo ./setup.py install

reacting on some OSC messages, complete with a PD patch to try, fixed IP Address for now, replace it with the IP Address of the Raspi

pyoscserver.py.zip

An other possibility would have been the Python OSC. It just runs with Python3.
https://pypi.python.org/pypi/python-osc