{"id":9342,"date":"2020-10-19T14:05:16","date_gmt":"2020-10-19T14:05:16","guid":{"rendered":"https:\/\/www.askpython.com\/?p=9342"},"modified":"2020-10-19T14:05:18","modified_gmt":"2020-10-19T14:05:18","slug":"plot-customize-pie-chart-in-python","status":"publish","type":"post","link":"https:\/\/www.askpython.com\/python\/plot-customize-pie-chart-in-python","title":{"rendered":"How to Plot and Customize a Pie Chart in Python?"},"content":{"rendered":"\n

A pie chart is a circular statistical graphic, which is divided into slices to illustrate numerical proportions. In a pie chart, the arc length of each slice is proportional to the quantity it represents. <\/p>\n\n\n\n

Pie charts are a popular way to represent the results of polls. In this tutorial, we will learn how to plot a pie-chart. Furthermore, we will learn how to customize a pie chart in python. <\/p>\n\n\n\n

Let’s get started. <\/p>\n\n\n\n

Create sample data<\/h2>\n\n\n\n

Let’s create some sample data that we can use while plotting the pie-chart.<\/p>\n\n\n

\nlabels = 'Cricket', 'Football', 'Hockey', 'F1'\nsizes = [15, 30, 45, 10]\n<\/pre><\/div>\n\n\n
The data is representative of an opinion poll on people’s preferred sport. <\/p>\n\n\n\n
How to plot a Pie Chart? <\/h2>\n\n\n\n
To plot a Pie-Chart we are going to use matplotlib<\/a>. <\/p>\n\n\n
\nimport matplotlib.pyplot as plt\n<\/pre><\/div>\n\n\n
To plot a basic Pie-chart we need the labels and the values associated with those labels. <\/p>\n\n\n
\nlabels = 'Cricket', 'Football', 'Hockey', 'F1'\nsizes = [15, 30, 45, 10]\n\nfig1, ax1 = plt.subplots()\nax1.pie(sizes, labels=labels)\nax1.axis('equal')  \nplt.show()\n<\/pre><\/div>\n\n\n
On running the above code snippet we get the following output :<\/p>\n\n\n\n
\"Pie
Pie Chart<\/figcaption><\/figure><\/div>\n\n\n\n
Note that this is a very basic pie-chart. <\/p>\n\n\n\n
Now let’s see how can we customize the pie-chart and make it look more interesting. <\/p>\n\n\n\n
Customizing a Pie Chart in Python<\/h2>\n\n\n\n
Matplotlib offers a lot of customization options when plotting a pie-chart. Let’s look at these, one by one. <\/p>\n\n\n\n
1. Make a slice pop-out<\/h3>\n\n\n\n
You can make one or more slices of the pie-chart pop-out using the explode option. <\/p>\n\n\n\n
For this let’s declare an array that has the explosion values. The explosion array specifies the fraction of the radius with which to offset each slice.<\/p>\n\n\n
\nimport matplotlib.pyplot as plt\n\nlabels = 'Cricket', 'Football', 'Hockey', 'F1'\nsizes = [15, 30, 45, 10]\n\nexplode = (0, 0.1, 0, 0)\nfig1, ax1 = plt.subplots()\nax1.pie(sizes, explode=explode, labels=labels)\nplt.show()\n<\/pre><\/div>\n\n\n
Output :<\/p>\n\n\n\n
\"Explode\"
Explode<\/figcaption><\/figure><\/div>\n\n\n\n
Let’s try some different explosion values.<\/p>\n\n\n
\nimport matplotlib.pyplot as plt\n\nlabels = 'Cricket', 'Football', 'Hockey', 'F1'\nsizes = [15, 30, 45, 10]\n\nexplode = (0.4, 0.2, 0.2, 0.2) \nfig1, ax1 = plt.subplots()\nax1.pie(sizes, explode=explode, labels=labels)\nplt.show()\n<\/pre><\/div>\n\n\n
\"Explode
Explode <\/figcaption><\/figure><\/div>\n\n\n\n
2. Rotate the Pie-chart <\/h3>\n\n\n\n
You can rotate the pie-chart by setting a strartangle<\/strong>. <\/p>\n\n\n\n
It rotates the start of the pie chart by specified value in degrees counterclockwise from the x-axis.<\/p>\n\n\n\n
Let’s see it in action :<\/p>\n\n\n
\nimport matplotlib.pyplot as plt\n\nlabels = 'Cricket', 'Football', 'Hockey', 'F1'\nsizes = [15, 30, 45, 10]\n\nfig1, ax1 = plt.subplots()\nexplode = (0, 0.1, 0, 0) \nax1.pie(sizes, explode=explode, labels=labels,\n        shadow=True, startangle=90)\n\nplt.show()\n<\/pre><\/div>\n\n\n
Output :<\/p>\n\n\n\n
\"Rotate\"
Rotate 90<\/figcaption><\/figure><\/div>\n\n\n
\nimport matplotlib.pyplot as plt\n\nlabels = 'Cricket', 'Football', 'Hockey', 'F1'\nsizes = [15, 30, 45, 10]\n\nfig1, ax1 = plt.subplots()\nexplode = (0, 0.1, 0, 0)\nax1.pie(sizes, explode=explode, labels=labels,\n        shadow=True, startangle=45)\n\nplt.show()\n<\/pre><\/div>\n\n\n
\"Rotate
Rotate 45<\/figcaption><\/figure><\/div>\n\n\n\n
3. Display Percentages <\/h3>\n\n\n\n
You can also display the percentage along with each slice by using the following lines of code :<\/p>\n\n\n
\nimport matplotlib.pyplot as plt\n\nlabels = 'Cricket', 'Football', 'Hockey', 'F1'\nsizes = [15, 30, 45, 10]\n\nfig1, ax1 = plt.subplots()\nexplode = (0, 0.1, 0, 0) \nax1.pie(sizes, explode=explode, labels=labels,autopct='%1.1f%%',\n        shadow=True, startangle=90)\n\nplt.show()\n<\/pre><\/div>\n\n\n
Output :<\/p>\n\n\n\n
\"Percentage\"
Percentage<\/figcaption><\/figure><\/div>\n\n\n\n
4. Customizing colours <\/h3>\n\n\n\n
Matplotlib gives you the option to get creative and make your pie-chart look as vibrant as possible. <\/p>\n\n\n\n
To change the colours of your pie chart, use the following lines of code. <\/p>\n\n\n
\nimport matplotlib.pyplot as plt\n\nlabels = 'Cricket', 'Football', 'Hockey', 'F1'\nsizes = [15, 30, 45, 10]\n\ncolors = ( "orange", "cyan", "brown", \n          "grey") \nfig1, ax1 = plt.subplots()\nexplode = (0, 0.1, 0, 0) \nax1.pie(sizes, colors = colors, explode=explode, labels=labels,autopct='%1.1f%%',\n        shadow=True, startangle=90)\n\nplt.show()\n<\/pre><\/div>\n\n\n
Here we declare 4 colors that we want to use in a list. Then we pass that list as an argument while plotting the pie-chart. <\/p>\n\n\n\n
The output comes out as :<\/p>\n\n\n\n
\"Colour\"
Change Colours<\/figcaption><\/figure><\/div>\n\n\n\n
5. Displaying colour codes<\/h3>\n\n\n\n
Along with your pie-chart, you can also display a box that contains the colour scheme of your pie-chart. This is especially useful when there are a lot of slices in your pie-chart. <\/p>\n\n\n\n
To display the colour codes use the following snippet :<\/p>\n\n\n
\nimport matplotlib.pyplot as plt\n\nlabels = 'Cricket', 'Football', 'Hockey', 'F1'\nsizes = [15, 30, 45, 10]\n\ncolors = ( "orange", "cyan", "brown", \n          "grey") \nfig1, ax1 = plt.subplots()\nexplode = (0, 0.1, 0, 0) \n\nax1.pie(sizes, colors = colors, explode=explode, labels=labels,autopct='%1.1f%%', shadow=True, startangle=90)\npatches, texts, auto = ax1.pie(sizes, colors=colors, shadow=True, startangle=90,explode=explode, autopct='%1.1f%%' )\n\nplt.legend(patches, labels, loc="best")\nplt.show()\n<\/pre><\/div>\n\n\n
Output :<\/p>\n\n\n\n
\"Colour
Colour Codes<\/figcaption><\/figure><\/div>\n\n\n\n
Conclusion <\/h3>\n\n\n\n
This tutorial was about how to plot and customize a pie-chart in Python using Matplotlib. Hope you had fun learning with us. To go through the official documentation of matplotlib, use this link<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
A pie chart is a circular statistical graphic, which is divided into slices to illustrate numerical proportions. In a pie chart, the arc length of each slice is proportional to the quantity it represents. Pie charts are a popular way to represent the results of polls. In this tutorial, we will learn how to plot […]<\/p>\n","protected":false},"author":14,"featured_media":9353,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9342","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/posts\/9342","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/comments?post=9342"}],"version-history":[{"count":0,"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/posts\/9342\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/media\/9353"}],"wp:attachment":[{"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/media?parent=9342"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/categories?post=9342"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.askpython.com\/wp-json\/wp\/v2\/tags?post=9342"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}