Pi Switch is a Python library for the Raspberry Pi to control 315/433MHz remote controlled power sockets. This library is basically a Python wrapper around the Arduino rc-switch C++ library.
You're on your own if you try to use this library and need help with it!
Please note that Pi Switch is deprecated. There are better solutions out there for the Raspberry Pi. Have a look at the great Python rc-switch port rpi-rf. The latter is a pure Python package, without the need to compile any C++ code.