[Python] Matplotlib animation doesn't clear previous frame before plotting new one

So, I'm trying to create an animated plot, but I want the previous frame to be cleared before a new one appears. What I keep getting is all frames at the same time or just a blank plot.



fig, ax = plt.subplots()

campo = ax.plot(x2[0], phiSol[0])[0]

def init():
campo.set_data([],[])
return campo

def update(frame):
campo.set_xdata(x2[:frame])
campo.set_ydata(phiSol[:frame])

return campo

anima = ani.FuncAnimation(fig=fig, func=update, init_func=init, frames=40, interval=30)
HTML(anima.to_jshtml())


I tried to build an init_func, but none of my tries worked. The last try is that one in the above code. How could I do it?

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