content: import numpy as np
  import matplotlib.pyplot as plt
  from matplotlib.widgets import Slider, Button, RadioButtons
  
  fig, ax = plt.subplots()
  plt.subplots_adjust(left=0.25, bottom=0.25)
  t = np.arange(0.0, 1.0, 0.001)
  a0 = 5
  f0 = 3
  s = a0*np.sin(2*np.pi*f0*t)
  l, = plt.plot(t,s, lw=2, color='red')
  plt.axis([0, 1, -10, 10])
  
  axcolor = 'lightgoldenrodyellow'
  axfreq = plt.axes([0.25, 0.1, 0.65, 0.03], axisbg=axcolor)
  axamp  = plt.axes([0.25, 0.15, 0.65, 0.03], axisbg=axcolor)
  
  sfreq = Slider(axfreq, 'Freq', 0.1, 30.0, valinit=f0)
  samp = Slider(axamp, 'Amp', 0.1, 10.0, valinit=a0)
  
  def update(val):
      amp = samp.val
      freq = sfreq.val
      l.set_ydata(amp*np.sin(2*np.pi*freq*t))
      fig.canvas.draw_idle()
  sfreq.on_changed(update)
  samp.on_changed(update)
  
  resetax = plt.axes([0.8, 0.025, 0.1, 0.04])
  button = Button(resetax, 'Reset', color=axcolor, hovercolor='0.975')
  def reset(event):
      sfreq.reset()
      samp.reset()
  button.on_clicked(reset)
  
  rax = plt.axes([0.025, 0.5, 0.15, 0.15], axisbg=axcolor)
  radio = RadioButtons(rax, ('red', 'blue', 'green'), active=0)
  def colorfunc(label):
      l.set_color(label)
      fig.canvas.draw_idle()
  radio.on_clicked(colorfunc)
  
  plt.show()
  