Bar Chart Race Python Package Official Release

Official Release of bar_chart_raceA Python Package for Creating Animated Bar Chart Races

I’m excited to announce the official release of bar_chart_race, a python package for creating bar chart races. In this post, I'll cover many of the major available options. Navigate to the official documentation for all of the options.

Motivation

Bar chart races have become very popular over the last year and no python package existed to create them. I built some for my coronavirus dashboard.

YouTube Tutorial

This post is available as a tutorial on YouTube

https://medium.com/media/cd804a999b64001f7921f05b2af71602/hrefInstallation

Install with:

pip install bar_chart_race

This is the first major release — version 0.1.0

>>> import bar_chart_race as bcr
>>> bcr.__version__
'0.1.0'Data must be in a particular format

In order to use bar_chart_race, your data must be in ‘wide’ pandas DataFrame where:

Every row represents a single period of timeEach column holds the value for a particular categoryThe index contains the time component (optional)Load data

A few sample datasets are available to download via the load_dataset function. The covid19_tutorial dataset contains the total deaths due to COVID-19 of selected countries over a period of 10 days.

df = bcr.load_dataset('covid19_tutorial')
dfBasic Bar Chart Race

Once you have data in the correct format, you can pass it directly to bar_chart_race.

bcr.bar_chart_race(df)https://medium.com/media/2bd0ab86c7386f048878106adecf6236/hrefChange orientation

By default, bars are horizontal, but can be made vertical with the orientation parameter.

bcr.bar_chart_race(df, orientation='v')https://medium.com/media/2c6e1c5df3b661ec7800269d3b81732a/hrefChange sort order

Set sort to 'asc' to change the order of the bars.

bcr.bar_chart_race(df, sort='asc')https://medium.com/media/e1c44748a501998a2232ed3dfe795d3c/hrefLimit bars

Limit the number of bars plotted with n_bars.

bcr.bar_chart_race(df, n_bars=6)https://medium.com/media/ad4a46f0c24ca7f00ff6ab6d0d858cc3/hrefFix order

Fix the order of the bars for the duration of the animation by setting fixed_order to a list.

bcr.bar_chart_race(df, fixed_order=['Iran', 'USA', 'Italy',
'Spain', 'Belgium'])https://medium.com/media/5305c1cc254f57c550248eb1a91d4f9e/hrefFixed max

Fix the maximum value for the entire duration of the animation.

bcr.bar_chart_race(df, fixed_max=True)https://medium.com/media/71282ec6beaacb30e20ca3b4574d0581/hrefSmoothness

By default, 10 frames are used per time period with the entire period lasting 500 milliseconds (half of a second). Both of these are changed below.

bcr.bar_chart_race(df, steps_per_period=20, period_length=200)https://medium.com/media/cd2529a4163b48ec5410beac5341859b/hrefInterpolate period

Linearly interpolate the period label.

bcr.bar_chart_race(df, interpolate_period=True)https://medium.com/media/b89e37f28394088354d548cf0b2abf4c/hrefPlotting properties

bar_chart_race uses matplotlib for all of the underlying plotting. Many properties can be set by using parameters common to matplotlib.

bcr.bar_chart_race(df,
figsize=(5, 3),
dpi=100,
label_bars=False,
period_label={'x': .99, 'y': .1, 'ha': 'right', 'color': 'red'},
title='COVID-19 Deaths by Country')https://medium.com/media/6fe6edd20c6d5d322ad5fa77201a49c2/hrefBar properties

Bar properties can also be set.

bcr.bar_chart_race(df, bar_kwargs={'alpha': .2, 'ec': 'black', 'lw': 3})https://medium.com/media/661162ce809f957a34aa4f7efc087723/hrefPeriod label format

The period label can be formatted with date directives or new-style string formatting.

bcr.bar_chart_race(df, period_fmt='%b %-d, %Y')https://medium.com/media/d66ad1782ba1141cf84762ce951a5bfa/hrefCustom summary label

Add a custom label to the plot that summarizes the current time period.

def summary(values, ranks):
total_deaths = int(round(values.sum(), -2))
s = f'Total Deaths - {total_deaths:,.0f}'
return {'x': .99, 'y': .05, 's': s, 'ha': 'right', 'size': 8}

bcr.bar_chart_race(df, period_summary_func=summary)https://medium.com/media/2926df48fc6dfdddfcb85279785d69bd/hrefPerpendicular line

A single perpendicular bar can be added to summarize each period as well.

def func(values, ranks):
return values.quantile(.9)

bcr.bar_chart_race(df, perpendicular_bar_func=func)https://medium.com/media/4a0653cf765901dedc5cbdcd8d789bc0/hrefPublished with Jupyter to Medium

This blog post was published with jupyter_to_medium, a python package I createdto automate the process of publishing Jupyter Notebooks as Medium blog posts.

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