Population pyramid with python

Cedric Vidonne

Lei Chen

Population pyramid with python

A population pyramid consists of two histograms, one for each gender (conventionally, males on the left and females on the right) where the population numbers are shown horizontally (X-axis) and the age vertically (Y-axis). The values can be displayed either as a percentage of the total population or as a raw number.

More about: Population pyramid

Population pyramid

import matplotlib.pyplot as plt
import pandas as pd

#load data set
df = pd.read_csv('https://raw.githubusercontent.com/GDS-ODSSS/unhcr-dataviz-platform/master/data/distribution/population_pyramid.csv')

#compute data array for plotting
x_male = df['male'] / -1
x_female = df['female']
y = df['ages']

#plot the chart
fig, ax = plt.subplots()
ax1 = ax.barh(y, x_male)
ax2 = ax.barh(y, x_female)

ax.bar_label(ax1, labels=[f'{x*100:,.0f}%' for x in -ax1.datavalues])
ax.bar_label(ax2, labels=[f'{x*100:,.0f}%' for x in ax2.datavalues])

#set chart title
ax.set_title('Demographic of forcibly displaced people | 2020')

#set axis label
ax.set_ylabel('Age groups')
ax.set_xlabel('Male / Female')

#set chart source and copyright
plt.annotate('Source: UNHCR Refugee Data Finder', (0,0), (0, -25), xycoords='axes fraction', textcoords='offset points', va='top', color = '#666666', fontsize=9)
plt.annotate('©UNHCR, The UN Refugee Agency', (0,0), (0, -35), xycoords='axes fraction', textcoords='offset points', va='top', color = '#666666', fontsize=9)

#adjust chart margin and layout

#show chart

A population pyramid showing demographic of forcibly displaced people | 2020

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