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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 from_tsv(cls, line, field_names, timezone_in_use=pytz.utc, database=None):
        '''
        Create a model instance from a tab-separated line. The line may or may not include a newline.
        The `field_names` list must match the fields defined in the model, but does not have to include all of them.

        - `line`: the TSV-formatted data.
        - `field_names`: names of the model fields in the data.
        - `timezone_in_use`: the timezone to use when parsing dates and datetimes.
        - `database`: if given, sets the database that this instance belongs to.
        '''
        from six import next
        values = iter(parse_tsv(line))
        kwargs = {}
        for name in field_names:
            field = getattr(cls, name)
            kwargs[name] = field.to_python(next(values), timezone_in_use)

        obj = cls(**kwargs)
        if database is not None:
            obj.set_database(database)

        return obj