Criando e colorindo retas com Matplot.

reta-simples-cores.py

import numpy as np
import matplotlib.pyplot as plt

"""
Escolhendo cores para as retas
"""
x = np.arange(1, 11)
print(x)

plt.figure(figsize=(6, 4))
plt.plot(x, 2*x, color='#17a589') # green
plt.plot(x, x/2, color='red')
plt.plot(x, x+3, color='#f4d03f') # yellow
plt.xlabel('x')
plt.ylabel('f(x)')
plt.grid(True)
plt.savefig('reta-simples-cores.png')