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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_input(cls, input_file=sys.stdin, modify=None, backend=None):
 """ Creates a Task object, directly from the stdin, by reading one line. If modify=True, two lines are used, first line interpreted as the original state of the Task object, and second line as its new, modified value. This is consistent with the TaskWarrior's hook system. Object created by this method should not be saved, deleted or refreshed, as t could create a infinite loop. For this reason, TaskWarrior instance is set to None. Input_file argument can be used to specify the input file, but defaults to sys.stdin. """


        # Detect the hook type if not given directly
        name = os.path.basename(sys.argv[0])
        modify = name.startswith('on-modify') if modify is None else modify

        # Create the TaskWarrior instance if none passed
        if backend is None:
            backends = importlib.import_module('tasklib.backends')
            hook_parent_dir = os.path.dirname(os.path.dirname(sys.argv[0]))
            backend = backends.TaskWarrior(data_location=hook_parent_dir)

        # TaskWarrior instance is set to None
        task = cls(backend)

        # Load the data from the input
        task._load_data(json.loads(input_file.readline().strip()))

        # If this is a on-modify event, we are provided with additional
        # line of input, which provides updated data
        if modify:
            task._update_data(json.loads(input_file.readline().strip()),
                              remove_missing=True)

        return task