Changing width of bars in bar chart created using seaborn.factorplot

Question

I'm trying to create bar chart using seaborn.factorplot. My code looks like this:

 import seaborn
 import matplotlib.pyplot as plt 

df=pd.read_csv('data.csv')

 fg = seaborn.factorplot(x='vesselID', y='dur_min', hue='route', size=6,aspect=2    ,kind='bar', data=df)

my data.csv looks like this

 ,route,vesselID,dur_min
 0,ANA-SJ,13,39.357894736842105
 1,ANA-SJ,20,24.747663551401867
 2,ANA-SJ,38,33.72142857142857
 3,ANA-SJ,69,37.064516129032256
 4,ED-KING,30,22.10062893081761
 5,ED-KING,36,21.821428571428573
 6,ED-KING,68,23.396551724137932
 7,F-V-S,1,13.623239436619718
 8,F-V-S,28,14.31294964028777
 9,F-V-S,33,16.161616161616163
 10,MUK-CL,18,13.953191489361702
 11,MUK-CL,19,14.306513409961687
 12,PD-TAL,65,12.477272727272727
 13,PT-COU,52,27.48148148148148
 14,PT-COU,66,28.24778761061947
 15,SEA-BI,25,30.94267515923567
 16,SEA-BI,32,31.0
 17,SEA-BI,37,31.513513513513512
 18,SEA-BR,2,55.8
 19,SEA-BR,13,57.0
 20,SEA-BR,15,54.05434782608695
 21,SEA-BR,17,50.43859649122807

Now my question is how to change the width of the bar and I'm not able to achieve this by changing size and aspect.

Answer 1

In my case, I didn't have to define a custom function to change the width as suggested above (which btw didn't work for me as all the bars were unaligned). I simply added the attribute dodge=False to the argument of the seaborn plotting function and this made the trick! e.g.

sns.countplot(x='x', hue='y', data=data, dodge=False);

See additional reference here: https://github.com/mwaskom/seaborn/issues/871

My bar plot looks now like this:

Answer 2

In fact, you can do it using directly the patches attributes with the function set_width. However if you only do that, you will just modify your patches width but not the position on the axe, so you have to change the x coordinates too.

import pylab as plt
import seaborn as sns

tips = sns.load_dataset("tips")
fig, ax = plt.subplots()

sns.barplot(data=tips, ax=ax, x="time", y="tip", hue="sex")

def change_width(ax, new_value) :
    for patch in ax.patches :
        current_width = patch.get_width()
        diff = current_width - new_value

        # we change the bar width
        patch.set_width(new_value)

        # we recenter the bar
        patch.set_x(patch.get_x() + diff * .5)

change_width(ax, .35)
plt.show()

And here is the result :