python双轴折线图示例

[python]代码库

import matplotlib as mpl
import numpy as np
import matplotlib.pyplot as plt

np.random.seed(2000)
date = np.random.standard_normal((20, 2))
y = date.cumsum(axis=0)

y[:, 0] = y[:, 0] * 100

fig, ax1 = plt.subplots()
plt.plot(y[:, 0], 'b', label="1st")
plt.plot(y[:, 0], 'ro')

plt.grid(True)
plt.axis('tight')
plt.xlabel("Index")
plt.ylabel('Values of 1st')
plt.title("This is double axis label")

plt.legend(loc=0)

ax2 = ax1.twinx()
plt.plot(y[:, 1], 'g', label="2st")
plt.plot(y[:, 1], 'r*')
plt.ylabel("Values of 2st")
plt.legend(loc=0)

plt.show()

[代码运行效果截图]