Example for drawing a bar in Python

draw-bar-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])

plt.subplots(figsize=(10, 6))
plt.bar(xticks, cnt)

plt.xlabel('XXXXXX',fontsize = 'large')
plt.ylabel('YYYYYY', fontsize = 'large')
plt.tight_layout()

plt.savefig("test.png")