[Python] Passing colors as a list to matplotlib

I have a plot with x of shape 180 and y of shape 36, 180. So I have 36 lines when I call plot. How do I set the first 30 to blue and the last six to red without calling a loop?

import numpy as np
import matplotlib.pyplot as plt


x = np.linspace(0, 10, 180)
y = np.random.rand(36, 180)


colors = ['blue'] * 30 + ['red'] * 6

plt.plot(x, y.T, color=colors)

plt.show()


However this returns the following error:

ValueError: ['blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'blue', 'red', 'red', 'red', 'red', 'red', 'red'] is not a valid value for color

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