I am a python beginner. This is my first time building a 3D scatterplot animation. In my code, I only want 6 points to display in a frame and remove points before the next frame comes. After writing the code, the problem came. The video is like a photo (see below) and shows every point.
Please help me, I don't know how to change my code.

Notes

You can simplify the code by using pandas to read data from csv file:

import pandas as pd

data = pd.read_csv('data/id3.csv')

x = data['x']
y = data['y']
z = data['z']
x1 = data['x1']
y1 = data['y1']
z1 = data['z1']