Библиотека Matplotlib для построения графиков на Python

import numpy as np
import matplotlib.pyplot as plt
x = [125, 250, 500, 1000, 2000, 4000 ,8000]
y1 = [125, 250, 500, 1000, 4000, 8000]
y2 = [-10, -20, -25, -60, -70,-90,-90]
plt.figure(figsize=(20, 10))
plt.plot(x, y2, 'o-r', alpha=0.7, label="second", lw=5, mec='b', mew=2, ms=10)
plt.grid(True)