Is it possible to add hatches to each individual bar in seaborn.barplot?

Question

ax = sns.barplot(x="size", y="algorithm", hue="ordering", data=df2, palette=sns.color_palette("cubehelix", 4))

After (or before) creating a seaborn barplot, is there a way for me to pass in hatch (fill in patterns along with the colors) values for each bar? A way to do this in seaborn or matplotlib would help a lot!

Answer 1

You can loop over the bars created by catching the AxesSubplot returned by barplot, then looping over its patches. You can then set hatches for each individual bar using .set_hatch()

Here's a minimal example, which is a modified version of the barplot example from here.

import matplotlib.pyplot as plt
import seaborn as sns

# Set style
sns.set(style="whitegrid", color_codes=True)

# Load some sample data
titanic = sns.load_dataset("titanic")

# Make the barplot
bar = sns.barplot(x="sex", y="survived", hue="class", data=titanic);

# Define some hatches
hatches = ['-', '+', 'x', '\\', '*', 'o']

# Loop over the bars
for i,thisbar in enumerate(bar.patches):
    # Set a different hatch for each bar
    thisbar.set_hatch(hatches[i])

plt.show()

Thanks to @kxirog in the comments for this additional info:

for i,thisbar in enumerate(bar.patches) will iterate over each colour at a time from left to right, so it will iterate over the left blue bar, then the right blue bar, then the left green bar, etc.