2. Image tell

See: https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.tell

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2.1. Tell

Use the Image.tell() method to return the current frame number, starting at 0, in the sequence file, such as a gif.

from PIL import Image

with Image.open("new_gifs/transform_tilt_x.gif") as im_gif:
    print(im_gif.tell())
    # 0