rotate gif image python

rotategifimage.py

from PIL import Image

name_image = "20181023_115428129.gif"
im1 = Image.open(name_image)

frames = []

for frame in range(0, im1.n_frames):
    im1.seek(frame)
    im2 = im1.rotate(90, resample=Image.BICUBIC, expand=True)
    frames.append(im2)

frames[0].save("rotated" + name_image, format='GIF', append_images=frames[1:], save_all=True, loop=0)