Method load_robot_constants

Software/Python/easygopigo3.py:146–177

Load wheel diameter and wheel base width constants for the GoPiGo3 from file. This method gets called by the constructor. :param str config_file_path = "/home/pi/Dexter/gpg3_config.json": Path to JSON config file that stores the wheel diameter and wheel base width for the

(self, config_file_path="/home/pi/Dexter/gpg3_config.json")

        self.use_mutex = use_mutex

    def load_robot_constants(self, config_file_path="/home/pi/Dexter/gpg3_config.json"):
        """
        Load wheel diameter and wheel base width constants for the GoPiGo3 from file.

        This method gets called by the constructor.

        :param str config_file_path = "/home/pi/Dexter/gpg3_config.json": Path to JSON config file that stores the wheel diameter and wheel base width for the GoPiGo3.
        :raises FileNotFoundError: When the file is non-existent.
        :raises KeyError: If one of the keys is not part of the dictionary.
        :raises ValueError: If the saved values are not positive numbers (floats or ints).
        :raises TypeError: If the saved values are not numbers.
        :raises IOError: When the file cannot be accessed.
        :raises PermissionError: When there are not enough permissions to access the file.
        :raises json.JSONDecodeError: When the config file fails at parsing. 

        Here's how the JSON config file must look like before reading it. Obviously, the supported format is JSON so that anyone can come in
        and edit their own config file if they don't want to go through saving the values by using the API.

        .. code-block:: json
        
            {
                "wheel-diameter": 66.5,
                "wheel-base-width": 117
            }

        """
        with open(config_file_path, 'r') as json_file:
            data = json.load(json_file)
            if data['wheel-diameter'] > 0 and data['wheel-base-width'] > 0:
                self.set_robot_constants(data['wheel-diameter'], data['wheel-base-width'])
            else:
                raise ValueError('positive values required')

    def save_robot_constants(self, config_file_path="/home/pi/Dexter/gpg3_config.json"):
        """