Saving a plotnine graph to png¶

Once you're done with exploratory data analysis, it's time to show your graphic to the world! That's when you export.

In [1]:

import pandas as pd
from plotnine import *

df = pd.DataFrame([
    { 'amount': 34, 'category': 'almonds'},
    { 'amount': 11, 'category': 'strawberries'},
    { 'amount': 20, 'category': 'oats'},
])
df

import pandas as pd from plotnine import * df = pd.DataFrame([ { 'amount': 34, 'category': 'almonds'}, { 'amount': 11, 'category': 'strawberries'}, { 'amount': 20, 'category': 'oats'}, ]) df

Out[1]:

	amount	category
0	34	almonds
1	11	strawberries
2	20	oats

Saving as a png¶

Unless you're going to be editing it in software like Adobe Illustrator, you usually want to save your graphic as a png! If you went with a jpeg file you're going to lose quality!

To save your graph, just save the graph as a variable and use .save('filename.png').

In [2]:

chart = (
    ggplot(df)
    + aes(x='category', y='amount')
    + geom_bar(stat='identity')
)
chart.save("filename.png")
chart

chart = ( ggplot(df) + aes(x='category', y='amount') + geom_bar(stat='identity') ) chart.save("filename.png") chart

/Users/soma/Development/plotnine/plotnine/ggplot.py:731: PlotnineWarning: Saving 6.4 x 4.8 in image.
/Users/soma/Development/plotnine/plotnine/ggplot.py:734: PlotnineWarning: Filename: filename.png

Out[2]:

<ggplot: (311459307)>

Changing the size of the output file¶

Sometimes you want a bigger or smaller image! To do this, you'll need to adjust the figure_size with the theme. It's in inches, which is very weird, but that's life. Just make it until the size seems right.

In [6]:

chart = (
    ggplot(df)
    + aes(x='category', y='amount')
    + geom_bar(stat='identity')
    + theme(figure_size=(10, 3))
)
chart.save("filename.png")
chart

chart = ( ggplot(df) + aes(x='category', y='amount') + geom_bar(stat='identity') + theme(figure_size=(10, 3)) ) chart.save("filename.png") chart

/Users/soma/Development/plotnine/plotnine/ggplot.py:731: PlotnineWarning: Saving 10 x 3 in image.
/Users/soma/Development/plotnine/plotnine/ggplot.py:734: PlotnineWarning: Filename: filename.png

Out[6]:

<ggplot: (313950067)>

In theory you can also change the resolution by passing dpi= but... it doesn't really matter (I think) unless you're doing something for print publications or getting fancy with multiple resolution images for retina screens.

In [ ]: