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change each line color as a rainbow python

from matplotlib.pyplot import cm
import numpy as np

#variable n below should be number of curves to plot

#version 1:

color=cm.rainbow(np.linspace(0,1,n))
for i,c in zip(range(n),color):
   plt.plot(x, y,c=c)

#or version 2:

color=iter(cm.rainbow(np.linspace(0,1,n)))
for i in range(n):
   c=next(color)
   plt.plot(x, y,c=c)

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change each line color as a rainbow python

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