How to make two sliders in matplotlib

Question

I would like to make two sliders in matplotlib to manually change N and P values in my predator-prey model:

import numpy as np
import matplotlib.pyplot as plt
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Answer 1

So, I have tried with this code:

from scipy import integrate
from matplotlib.widgets import Slider, Button, RadioButtons

fig, ax = plt.subplots()
plt.subplots_adjust(left=0.25, bottom=0.25)
plt.xlabel("Time")
plt.ylabel("Population size")
plt.legend(["Prey", "Predator"], loc="upper right")

plt.title('Prey & Predator Static Model')
plt.grid(color="b", alpha=0.5, linestyle="dashed", linewidth=0.5)

l1, l2 = plt.plot(t, equation)

axcolor = 'b'
ax_N = plt.axes([0.25, 0.1, 0.65, 0.03], axisbg=axcolor)
ax_P = plt.axes([0.25, 0.15, 0.65, 0.03], axisbg=axcolor)

sN = Slider(ax_N, 'N', 0, 80, valinit=1)
sP = Slider(ax_P, 'P', 0, 80, valinit=1)


def update(val):
    N = N*sN.val
    P = P*sP.val
    x = equation
    fig.canvas.draw_idle()
    l1, l2.set_ydata(y)    
    ax.set_ylim(y.min(), y.max())  
    draw()

sN.on_changed(update)
sP.on_changed(update)

plt.show()

I could not manipulate the sliders. Thank you so much @berna1111