en_sessen.py

import matplotlib.pyplot as plt
import numpy as np
import matplotlib.animation as animation
from IPython.display import HTML
u = np.linspace(0.001, 2 * np.pi, 100)
x = 10*np.cos(u)
y = 10*np.sin(u)
x_ = np.linspace(-13,13,100)

fig, ax = plt.subplots(figsize=(6,6),subplot_kw={'aspect': 'equal'})
ax.plot(x,y,'C6-')

p1,=ax.plot([],[],'C7o')
p2,=ax.plot([],[],color='C9')
    
def update(i):
    x0=x[i]
    y0=y[i]
    y_ = (-x0*x_ +100) / y0    
    p1.set_xdata(x0)
    p1.set_ydata(y0)
    p2.set_xdata(x_)
    p2.set_ydata(y_)
    
ax.set_xlim(-12.2, 12.2)
ax.set_ylim(-12.2, 12.2)
ani = animation.FuncAnimation(fig, update, interval = 30, frames = 100)
#ani.save('eli_animation.mp4', writer="ffmpeg",dpi=100)
HTML(ani.to_html5_video())

u = np.linspace(0.001, 2 * np.pi, 100)
x = 10*np.cos(u)
y = 10*np.sin(u)
x_ = np.linspace(-13,13,100)

fig, ax = plt.subplots(figsize=(6,6),subplot_kw={'aspect': 'equal'})
ax.plot(x,y,'C6-')

p1,=ax.plot([],[],'C7o')
p2,=ax.plot([],[])
    
def update(i):
    x0=x[i]
    y0=y[i]
    y_ = (-x0*x_ +100) / y0    
    p1.set_xdata(x0)
    p1.set_ydata(y0)
    ax.plot(x_,y_)
    
ax.set_xlim(-12.2, 12.2)
ax.set_ylim(-12.2, 12.2)
ani = animation.FuncAnimation(fig, update, interval = 30, frames = 100)
#ani.save('eli_animation.mp4', writer="ffmpeg",dpi=100)
HTML(ani.to_html5_video())

#version
import matplotlib
print(matplotlib.__version__)
print(np.__version__)
3.3.0
1.19.1