plt python how to create 2 axis plot code example

Example 1: second y axis matplotlib

import numpy as np
import matplotlib.pyplot as plt
x = np.arange(0, 10, 0.1)
y1 = 0.05 * x**2
y2 = -1 *y1

fig, ax1 = plt.subplots()

ax2 = ax1.twinx()
ax1.plot(x, y1, 'g-')
ax2.plot(x, y2, 'b-')

ax1.set_xlabel('X data')
ax1.set_ylabel('Y1 data', color='g')
ax2.set_ylabel('Y2 data', color='b')

plt.show()

Example 2: twin axis python

import numpy as np
import matplotlib.pyplot as plt
ax1=plt.subplot(111)
ax1.plot(np.arange(0,10),np.arange(0,10))
ax2=ax1.twinx()
ax2.plot(np.arange(10,20),np.arange(100,110))