Filtered fields

Pass a fields filter into the fitfile variable to get specific fields.

from fittie import decode


def main(filename: str):
    """
    Provide a message_type and optional set of field names to filter the output
    data of a direct iteration over the fitfile.
    """

    fitfile = decode(filename)

    # Get all fields from all "session" messages
    for data in fitfile(message_type="session"):
        print(data)

    # Get only certain field data from all "record" messages
    for data in fitfile(
        message_type="record", fields=[
            "timestamp", 
            "heart_rate", 
            "power", 
            "distance"
        ]
    ):
        print(data)


if __name__ == "__main__":
    main("/path/to/fit/file.fit")