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

 men_means = [2000, 3400, 3000, 3005, 2700]
 women_means = [2500, 3200, 3004, 2000, 2005]

 x = np.arange(len(labels))  # the label locations
 width = 0.35  # the width of the bars

 fig, ax = plt.subplots()
 rects1 = ax.bar(x - width/2, men_means, width, label='Men')
 rects2 = ax.bar(x + width/2, women_means, width, label='Women')

plt.axvline(mean, color="red")