Additional libraries
While the RPI.GPIO
module will certainly be sufficient for simple digital logic, you may find that you need to interface to a device that requires the use of one of the communication protocols supported by the Raspberry Pi, such as I2C or SPI.
Fortunately, there are Python libraries available that can do this; for I2C there is smbus-cffi (https://pypi.python.org/pypi/smbus-cffi) and SPI can be used through py-spidev (https://github.com/doceme/py-spidev).