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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def auto_mavlink_version(self, buf):
        '''auto-switch mavlink protocol version'''
        global mavlink
        if len(buf) == 0:
            return
        try:
            magic = ord(buf[0])
        except:
            magic = buf[0]
        if not magic in [ 85, 254, 253 ]:
            return
        self.first_byte = False
        if self.WIRE_PROTOCOL_VERSION == "0.9" and magic == 254:
            self.WIRE_PROTOCOL_VERSION = "1.0"
            set_dialect(current_dialect)
        elif self.WIRE_PROTOCOL_VERSION == "1.0" and magic == 85:
            self.WIRE_PROTOCOL_VERSION = "0.9"
            os.environ['MAVLINK09'] = '1'
            set_dialect(current_dialect)
        elif self.WIRE_PROTOCOL_VERSION != "2.0" and magic == 253:
            self.WIRE_PROTOCOL_VERSION = "2.0"
            os.environ['MAVLINK20'] = '1'
            set_dialect(current_dialect)
        else:
            return
        # switch protocol 
        (callback, callback_args, callback_kwargs) = (self.mav.callback,
                                                      self.mav.callback_args,
                                                      self.mav.callback_kwargs)
        self.mav = mavlink.MAVLink(self, srcSystem=self.source_system)
        self.mav.robust_parsing = self.robust_parsing
        self.WIRE_PROTOCOL_VERSION = mavlink.WIRE_PROTOCOL_VERSION
        (self.mav.callback, self.mav.callback_args, self.mav.callback_kwargs) = (callback,
                                                                                 callback_args,
                                                                                 callback_kwargs)