another pure Python implementation of the python-smbus package

 Currently supported features are:
    Get i2c capabilities (I2C_FUNCS)
    SMBus Packet Error Checking (PEC) support
    read_byte
    write_byte
    read_byte_data
    write_byte_data
    read_word_data
    write_word_data
    read_i2c_block_data
    write_i2c_block_data
    write_quick
    process_call
    read_block_data
    write_block_data
    block_process_call
    i2c_rdwr - combined write/read transactions with repeated start