Update python bindings to follow the PEP 8 standard

[icaven]

There are a number of formatting issues in the python bindings that cause warnings in PEP 8 aware IDEs:

• triple single quoted blocks for doc strings at the beginning of functions when they should be double quoted
• missing colons after variable names in the descriptions in the doc string of functions
• unused variables
• variables initialized to None when they should be initialized to a value of the intended type
• integer values used for initializing ctypes.c_bool when the python False should be used
• duplicated imports
• missing initialization of device index in Device (although it isn't used)
• unnecessary parentheses around tuples in returns

None of these affect functionality or performance, but they it more difficult to see actual errors with these being flagged.