[Python] The saved animated plot keeps looping although Matplotlib...

I'd like to make an animation using matplotlib for a powerpoint presentation. The animation should only play once.

In my code, the argument repeat of FuncAnimation() was set to false. Because I need to import the figure into powerpoint, I saved it using ani.save('test.gif'). The problem is when I open the saved figure which is test.gif, the lineplot keeps looping.

All the searches on Stackoverflow suggest repeat=False, or using PillowWriter. Both solutions are not working for me, so I have two questions:

1. why does the saved figure ignores repeat=False?
2. how can I solve this issue?

Thank you in advance for helping me out. Please, find my code below:

import pandas as pd

import matplotlib.pyplot as plt

# import matplotlib.animation as animation
from matplotlib.animation import FuncAnimation, PillowWriter

df = pd.DataFrame(
{
"x": {
0: 0,
1: 1,
2: 2,
3: 3,
4: 4,
5: 5,
6: 6,
7: 7,
8: 8,
9: 9,
10: 10,
11: 11,
12: 12,
13: 13,
14: 14,
15: 15,
16: 16,
17: 17,
18: 18,
19: 19,
20: 20,
21: 21,
22: 22,
23: 23,
24: 24,
25: 25,
26: 26,
27: 27,
28: 28,
29: 29,
30: 30,
31: 31,
32: 32,
33: 33,
34: 34,
35: 35,
36: 36,
37: 37,
38: 38,
39: 39,
40: 40,
41: 41,
42: 42,
43: 43,
44: 44,
45: 45,
46: 46,
47: 47,
48: 48,
49: 49,
50: 50,
},
"y": {
0: 0.7695,
1: 0.7983,
2: 0.7958,
3: 0.7975,
4: 0.7983,
5: 0.7966,
6: 0.7971,
7: 0.7962,
8: 0.7962,
9: 0.7975,
10: 0.7983,
11: 0.7987,
12: 0.7996,
13: 0.7992,
14: 0.7967,
15: 0.7983,
16: 0.7971,
17: 0.7987,
18: 0.7979,
19: 0.7983,
20: 0.7983,
21: 0.7921,
22: 0.7975,
23: 0.7962,
24: 0.7975,
25: 0.7979,
26: 0.7983,
27: 0.7992,
28: 0.7983,
29: 0.7983,
30: 0.7987,
31: 0.7983,
32: 0.7983,
33: 0.7983,
34: 0.7992,
35: 0.7975,
36: 0.7996,
37: 0.7992,
38: 0.7979,
39: 0.7987,
40: 0.7983,
41: 0.7983,
42: 0.7987,
43: 0.7987,
44: 0.7992,
45: 0.7992,
46: 0.7979,
47: 0.7996,
48: 0.7992,
49: 0.7987,
50: 0.7992,
},
}
)


x = df["x"]
y = df["y"]
fig, ax = plt.subplots()
line, = ax.plot(x, y, color="b")

def update(num, x, y, line):
line.set_data(x[:num], y[:num])
return (line,)

ani = FuncAnimation(
fig, update, len(x), fargs=[x, y, line], interval=15, blit=True, repeat=False
)

# ani.save('test.gif')
ani.save("test2.gif", dpi=80, writer=PillowWriter(fps=5))

plt.show()

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