Change hatch density in barplot of Python Matplotlib.pyplot

The result is:

This page shows how to increase the hatch density in barplot of matplotlib.
By changing the hatch string, you can change the hatch density.

In [1]:

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

In [2]:

x = [1,2,3]
y = [1,2,3]

In [3]:

plt.figure(figsize=(7,5))
for i in range(6):
    # String to determine the type and density of the hatch.
    # For example, '///' is denser than '/'.
    hatch_str = "/"*i

    # Plot bars 
    ax = plt.subplot(2,3,i+1)
    ax.set_title(u"Hatch string is: %s"%hatch_str)
    bars = ax.bar(x,y,facecolor='cyan',edgecolor='black')
    
    # Set the hatch for each bar
    for bar in bars:
        bar.set_hatch(hatch_str)
    
plt.tight_layout()
plt.savefig('barplot_hatch_density.png',bbox_inches='tight',pad_inches=0.02,dpi=200)