geekcomputers/Python · error · TypeError

The parameter fp should be a sequence containing the path of

Error message

The parameter fp should be a sequence containing the path of the images of the tube body and the tube mouth.

What it means

Tubes' constructor requires fp to be a sequence of exactly two image paths: the tube body image and the tube mouth image. If len(fp) != 2 a TypeError is raised because the sprite drawing code indexes both parts.

Source

Thrown at Flappy Bird - created with tkinter/Tubes.py:34

    __move = 10
    __pastTubes = []

    def __init__(
        self,
        background,
        bird,
        score_function=None,
        *screen_geometry,
        fp=("tube.png", "tube_mourth"),
        animation_speed=50,
    ):
        # Verifica os parâmetros passados e lança um erro caso algo esteja incorreto
        if not isinstance(background, Background):
            raise TypeError(
                "The background argument must be an instance of Background."
            )
        if not len(fp) == 2:
            raise TypeError(
                "The parameter fp should be a sequence containing the path of the images of the tube body and the tube mouth."
            )
        if not isinstance(bird, Bird):
            raise TypeError("The birdargument must be an instance of Bird.")
        if not callable(score_function):
            raise TypeError("The score_function argument must be a callable object.")

        Thread.__init__(self)

        # Instância os parâmetros
        self.__background = background
        self.image_path = fp
        self.__animation_speed = animation_speed
        self.__score_method = score_function

        # Recebe a largura e altura do background
        self.__width = screen_geometry[0]
        self.__height = screen_geometry[1]

View on GitHub (pinned to 40f4cd2652)

Solutions

1. Pass a 2-tuple/list: fp=('tube_body.png', 'tube_mouth.png')
2. If you have one image, duplicate it: fp=('tube.png', 'tube.png')
3. Ensure both image files exist and paths are correct

Example fix

# before
tubes = Tubes(bg, bird, score_fn, fp=('tube.png',))
# after
tubes = Tubes(bg, bird, score_fn, fp=('tube.png', 'tube_mouth.png'))

fp = tuple(fp) if hasattr(fp, '__iter__') else (fp, fp)
assert len(fp) == 2, 'fp must be (body_image, mouth_image)'

def is_valid_fp(fp) -> bool:
    return hasattr(fp, '__len__') and not isinstance(fp, str) and len(fp) == 2

try:
    tubes = Tubes(bg, bird, fn, fp=images)
except TypeError as e:
    print('fp validation failed:', e)

When it happens

Trigger: Passing a single image path string, a 3-element tuple, or the default partially overridden (e.g. fp=('tube.png',)) so len(fp) != 2. Note a plain string of length 2 also accidentally passes this check.

Common situations: Overriding the default fp with only one image; changing art assets and forgetting the mouth texture; passing a path string whose length happens to differ from 2 (string length, not element count, is checked for str inputs).

Related errors

• The tk_instance argument must be an instance of Tk.
• The background argument must be an instance of Background.
• The background argument must be an instance of Background.
• The birdargument must be an instance of Bird.
• The gameover_method argument must be a callable object.

AI-assisted analysis of geekcomputers/Python@40f4cd2652 (2026-08-27). Data as JSON: /api/errors/6e89d2a5a8d9d47a. Report an issue: GitHub.