import numpy as np
import matplotlib.pyplot as plt
t = np.arange(0.01, 20.0, 0.001)
data1 = np.exp(t)
data2 = np.sin(0.3 * np.pi * t)
fig, ax1 = plt.subplots()
color = 'tab:blue'
ax1.set_xlabel('time (s)')
ax1.set_ylabel('exp', color = color)
ax1.plot(t, data1, color = color)
ax1.tick_params(axis ='y', labelcolor = color)
ax2 = ax1.twinx()
color = 'tab:green'
ax2.set_ylabel('sin', color = color)
ax2.plot(t, data2, color = color)
ax2.tick_params(axis ='y', labelcolor = color)
fig.suptitle('matplotlib.pyplot.twinx() function \
Example\n\n', fontweight ="bold")
plt.show()