Example for drawing a bar and a line in the same figure in Python

draw-bar-line-exp.py

import matplotlib.pyplot as plt
import numpy as np

xticks = ['15-1','15-2','15-3','15-4','16-1','16-2','16-3','16-4',
          '17-1','17-2','17-3','17-4','18-1','18-2','18-3','18-4','19-1','19-2','19-3']

cnt = np.array([17.17646221,19.43652252,30.54252321,32.78014989,34.46738787,37.55476953,40.99359145,42.65602493,
                   45.62631487,50.40547517,51.19912708,55.64568829,57.58204446,51.35193284,49.39556185,50.08214678,
                   50.84948824,55.20547267,60.22801956])
size = np.array([5.735962982,6.630246013,9.499133204,10.29255457,11.19376834,12.47500742,14.02777201,15.28399689,
                    16.944369,19.15263185,22.12279345,29.85357858,31.09525989,27.87855024,27.10313029,27.78113192,
                    28.45668532,31.1445823,34.29272631])

fig, ax1 = plt.subplots(figsize=(10, 6))
ax1.bar(xticks, cnt)
ax1.set_xlabel('XXXXX',fontsize = 'large')
ax1.set_ylabel('Y111111', fontsize = 'large')


ax2 = ax1.twinx()
ax2.plot(xticks, size, 'H--r')

ax2.set_ylabel('Y222222', fontsize = 'large')

plt.tight_layout()

plt.savefig("test.png")