smbus/smbus.py
def read_byte_data(self, addr, cmd):
        """read_byte_data(addr, cmd) -> result

        Perform SMBus Read Byte Data transaction.
        """
        self._set_addr(addr)
        res = SMBUS.i2c_smbus_read_byte_data(self._fd, ffi.cast("__u8", cmd))
        if res == -1:
            raise IOError(ffi.errno)
        return res
def read_byte_data(self, addr, cmd):
        """read_byte_data(addr, cmd) -> result

        Perform SMBus Read Byte Data transaction.
        """
        self._set_addr(addr)
        res = SMBUS.i2c_smbus_read_byte_data(self._fd, ffi.cast("__u8", cmd))
        if res == -1:
            raise IOError(ffi.errno)
        return res
read_byte_data(addr, cmd) -> result

        Perform SMBus Read Byte Data transaction.