问我的plt动画不工作："'NoneType‘对象没有属性’画布‘“

EN

def afficher(self, inclure_satisfaction=False, inclure_carte_categories=False, size=5):
    carte = self.carte_categories(inclure_satisfaction=inclure_satisfaction)
    if inclure_carte_categories:
        print("Voici la carte des catégories (à titre de vérification)")
        print(carte)
    
    mat_rs = masked_array(carte, carte!=1.5)
    mat_ri = masked_array(carte, carte!=1)
    mat_bs = masked_array(carte, carte!=2.5)
    mat_bi = masked_array(carte, carte!=2)

    plt.figure(figsize=(size, size))
    affichage_rs = plt.imshow(mat_rs, cmap=cmap_rs)
    affichage_ri = plt.imshow(mat_ri, cmap=cmap_ri)
    affichage_bs = plt.imshow(mat_bs, cmap=cmap_bs)
    affichage_bi = plt.imshow(mat_bi, cmap=cmap_bi)
    return plt.figure()

def resoudre2(self):
    fig = plt.figure(figsize=(5,5))
    list_of_artists = []
    while self.habitants_insatisfaits != []:
        self.demenagement_insatisfait_aleatoire()
        list_of_artists.append([self.afficher(inclure_satisfaction=True)])
    ani = ArtistAnimation(fig, list_of_artists, interval=200, blit=True)
    return ani

a = ville1.resoudre2(compter=True)

/usr/local/lib/python3.7/dist-packages/ipykernel_launcher.py:211: RuntimeWarning: More than 20 figures have been opened. Figures created through the pyplot interface (`matplotlib.pyplot.figure`) are retained until explicitly closed and may consume too much memory. (To control this warning, see the rcParam `figure.max_open_warning`).
/usr/local/lib/python3.7/dist-packages/ipykernel_launcher.py:206: RuntimeWarning: More than 20 figures have been opened. Figures created through the pyplot interface (`matplotlib.pyplot.figure`) are retained until explicitly closed and may consume too much memory. (To control this warning, see the rcParam `figure.max_open_warning`).
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/matplotlib/cbook/__init__.py", line 196, in process
    func(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/matplotlib/animation.py", line 951, in _start
    self._init_draw()
  File "/usr/local/lib/python3.7/dist-packages/matplotlib/animation.py", line 1533, in _init_draw
    fig.canvas.draw_idle()
AttributeError: 'NoneType' object has no attribute 'canvas'
/usr/local/lib/python3.7/dist-packages/matplotlib/image.py:452: UserWarning: Warning: converting a masked element to nan.
  dv = np.float64(self.norm.vmax) - np.float64(self.norm.vmin)
/usr/local/lib/python3.7/dist-packages/matplotlib/image.py:459: UserWarning: Warning: converting a masked element to nan.
  a_min = np.float64(newmin)
/usr/local/lib/python3.7/dist-packages/matplotlib/image.py:464: UserWarning: Warning: converting a masked element to nan.
  a_max = np.float64(newmax)
<string>:6: UserWarning: Warning: converting a masked element to nan.
/usr/local/lib/python3.7/dist-packages/matplotlib/colors.py:993: UserWarning: Warning: converting a masked element to nan.
  data = np.asarray(value)

print(a)
from IPython.display import HTML
HTML(a.to_html5_video())

<matplotlib.animation.ArtistAnimation object at 0x7f4cd376bfd0>

---------------------------------------------------------------------------

AttributeError                            Traceback (most recent call last)

<ipython-input-20-d7ca1fcdadb6> in <module>()
      1 print(a)
      2 from IPython.display import HTML
----> 3 HTML(a.to_html5_video())

2 frames

/usr/local/lib/python3.7/dist-packages/matplotlib/animation.py in _init_draw(self)
   1531         # Flush the needed figures
   1532         for fig in figs:
-> 1533             fig.canvas.draw_idle()
   1534 
   1535     def _pre_draw(self, framedata, blit):

AttributeError: 'NoneType' object has no attribute 'canvas'