Create animated gif with imageio library python

Trying to create an animated GIF with static images obtained from the seaborn library. The code is as follows:

import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
import os
import imageio.v3 as iio

image = []
folder = 'C:/Users/admin/PycharmProjects/pythonProject2/Project/Seaborn'



if not os.path.exists(folder):
    os.mkdir(folder)

for month in range(1, 4):
    porosity_cutoff = 250
    highlight_colour = 8
    non_highlight_colour = 10

    df = pd.read_csv('../Список.csv')
    df = df.loc[df['Месяц'] == month].sort_values(by='Баллы', ascending=False)

    df['colours'] = df["Баллы"].apply(lambda x: highlight_colour if x >= porosity_cutoff else non_highlight_colour)

    ax = sns.barplot(data=df.loc[df['Месяц'] == month], x="Баллы", y="Участники", palette="Set1", hue=df['colours'],
                     legend=False)

    plt.axvline(x=250, zorder=0, color='grey', ls='--', lw=1.5)

    plt.text(x=283, y=8, s='Порог допустимых баллов', ha='center', fontsize=11, bbox=dict(facecolor='white',
                                                                                          edgecolor="grey", ls='--'))

    ax.set_title(f"Рейтинг за {month} месяц", size=30)
    ax.set_ylabel("Участники", size=20)
    ax.set_xlabel("Баллы", size=20)

    for i in ax.containers:
        ax.bar_label(i, color="white", padding=-30, fontsize=12)

    filename = f'Рейтинг_{month}.png'

    plt.savefig(filename)

    image.append(iio.imread(filename))

    plt.close()

iio.imwrite('barplot.gif', image, duration=20)

In the end I get three images in png format with graphics, all the images are correct, but the giftcard itself is a static first graph. What can be changed or does not work in general?

Guess it’s about the list image and filling it out wrong

I can create animated gif without problem.

Problem can be only duration - it is in milliseconds and 20 ms is very short time and in some image viewers I can't see how fast frames are changed. When I use 500 ms (0.5 second) then I can see animation. BTW: it seems it can eventually get fps (frames per seconds) instead duration

import imageio.v3 as iio

images = []

for filename in ['1.png', '2.png', '3.png']:
    images.append(iio.imread(filename))

iio.imwrite('animated-gif-20ms.gif',  images, duration=20)
iio.imwrite('animated-gif-500ms.gif', images, duration=500)
iio.imwrite('animated-gif-2fps.gif',  images, fps=2)

Other problem can be also where you check this animation. If I put it directly in web browser (Firefox) or test with some image viewers then it displays animation only once and for duration 20ms I can see only last frame.

Documentation for Supported Formats shows that it uses pillow to create gif
and it can get also other options imageio.plugins.pillow_legacy

If I add loop=0 then image loops in Firefox and in image viewers.

iio.imwrite(..., loop=0)