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Venn Diagram using Matplotlib

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by Abdul Rawoof A R dot icon Updated: May 9, 2023

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John Venn found the Venn diagram in the year 1880. A Venn diagram is a graphical model of data or a logical representation. It illustrates two or three groups' relationships. We can use it to highlight similarities and differences. It helps compare the characteristics of various data sets. Circles represent each data set in the Venn diagram. 

Creating a simple Venn diagram

To create a Venn diagram, the following libraries are important Matplotlib and Matplotlib-Venn. It is a Python library for creating 2D graphs and plots using Python scripts. It has a module called pyplot that makes things easier for plotting. It will provide a feature to control line styles, formatting axes, and font properties. There are three types of Venn diagrams, two-circle, three-circle, and four-circle. In Python, to plot a two-circle Venn diagram, there are many ways to implement it. The venn2() function is the simplest way to supply two sets of values. Then it will plot the Venn diagrams for us. Customize Venn diagrams with the default colors of red and green circles. But the great thing is that we can customize the colors. 

Types of Venn diagram

There are three different types of Venn diagrams are there, 

1.Two-circle diagram(venn2). 

2.Three-circle diagram(venn3). 

3.Four-circle diagram(venn4). 


Generally, most charts we generate in data visualization belong to one or more types. The types can be bar charts, pie charts, line charts, and time series. But a Venn diagram is not used. It is another type of data visualization that needs to be more underrated. It allows us to examine the relationship between two different data sets. 

Advantages: 

  • A great thing for visual learners. 
  • A swift way to illustrate a complicated issue. 
  • Required high-order thinking. 

Disadvantages: 

  • Difficult to implement new ideas. 
  • Requires a knowledge base. 
  • May limit responses.

What is a Venn diagram? 

A set or a logical diagram shows operations, like the intersection and the union of sets. Then a Venn diagram is the difference between sets and is also used to depict subsets of a set. Example: A set of natural numbers is s subset of whole numbers, a subset of integers. 


To create a Venn diagram, we need two important libraries. The libraries can be Matplolib and Matplotlib-venn. There are three types of Venn diagrams, two-circle, three-circle, and four-circle. In Python, to plot a two-circle Venn diagram, there are two ways to do it. The simplest way is to supply two sets of values to the venn2() function, and then it will plot the Venn diagram for us. 

Matplotlib

  • It is a Python library to create 2D graphs and plots using Python scripts.
  • It has a module named pyplot that makes things easier for plotting.
  • It will provide a feature to control line styles, formatting axes, font properties, etc. 

Matplotlib-venn

  • We can use the functions for plotting area-proportional two and three-way Venn diagram.
  • This package provides four main functions such as venn2, venn2_circles, venn3, and venn3_circles.
  • venn2 and venn2_circles functions accept a 3-element list. The elements can be (Ab, aB, AB) of subset sizes as their required argument.


Here is an example of creating a Venn diagram using Matplotlib in Python:

Fig: Preview of the output that you will get on running this code from your IDE.

Code

In this solution we're using Matplotlib and Matplotlib-venn libraries.

Matplotlib Venn diagram with legend

Lines of Code : 29dotLicense : Strong Copyleft (CC BY-SA 4.0)

from collections import Counter
import matplotlib.pyplot as plt
from matplotlib_venn import venn2, venn3

sets = Counter()
sets['01'] = 3000
sets['11'] = 3
sets['10']  = 5
setLabels = ['set1', 'set2']

plt.figure()
ax = plt.gca()
v = venn2(subsets = sets, set_labels = setLabels, ax = ax)

h, l = [],[]
for i in sets:
    # remove label by setting them to empty string:
    v.get_label_by_id(i).set_text("")
    # append patch to handles list
    h.append(v.get_patch_by_id(i))
    # append count to labels list
    l.append(sets[i])

#create legend from handles and labels    
ax.legend(handles=h, labels=l, title="counts")

plt.title('Venn Diagram')
plt.show()

Instructions

Follow the steps carefully to get the output easily.

  1. Install PyCharm Community Edition on your computer.
  2. Open terminal and install the required libraries with following commands.
  3. Install Matplotlib - pip install matplotlib.
  4. Install Matplotlib-venn - pip install matplotlib-venn.
  5. Create a new Python file(eg: test.py).
  6. Copy the snippet using the 'copy' button and paste it into that file.
  7. Run the file using run button.


I hope you found this useful. I have added the link to dependent libraries, version information in the following sections.


I found this code snippet by searching for 'venn diagram using matplotlib' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in PyCharm 2022.3.3.
  2. The solution is tested on Python 3.9.7.
  3. Matplotlib version 3.7.1.
  4. Matplotlib-venn version 0.11.9.


Using this solution, we are able to create venn diagram using Matplotlib in Python with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to create venn diagram using Matplotlib in Python.

Dependent Libraries

matplotlib-vennby konstantint

Jupyter Notebook doticonstar image 408 doticonVersion:Currentdoticon
License: Permissive (MIT)

Area-weighted venn-diagrams for Python/matplotlib

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            matplotlib-vennby konstantint

            Jupyter Notebook doticon star image 408 doticonVersion:Currentdoticon License: Permissive (MIT)

            Area-weighted venn-diagrams for Python/matplotlib
            Support
              Quality
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                  License
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                      matplotlibby matplotlib

                      Python doticonstar image 17559 doticonVersion:v3.7.1doticon
                      no licences License: No License (null)

                      matplotlib: plotting with Python

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                                matplotlibby matplotlib

                                Python doticon star image 17559 doticonVersion:v3.7.1doticonno licences License: No License

                                matplotlib: plotting with Python
                                Support
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                                    Security
                                      License
                                        Reuse

                                          FAQ:  

                                          1. How can I customize Venn Diagrams in Python? 

                                          By default, red and green are the colors of the circles, but the great thing is that we can customize the colors as we wish. 


                                          2. What matplotlib import pyplot command can we use when creating a Venn diagram? 

                                          Matplotlib is a Python library to create 2D graphs and plots using Python scripts. It has a module named pyplot that makes things easier for plotting. 


                                          3. Can you provide an example plot of a 3-circle Venn diagram created with Python? 

                                          Begin with entering the number of items in common to all three data sets. Then, enter the remaining items in each pair of data sets' overlapping regions. And finally, use any known totals to find missing numbers. 


                                          4. What are some ways to compare three groups of data using a Matplotlib-Venn diagram? 

                                          The typical method for comparing 3 or more group means is the One-way analysis of variance. Its usual goal is to determine if at least one group's mean or median differs. Another way to compare is follow-up comparisons. It helps determine if we can encounter the difference. 


                                          5. How do I create a Venn diagram from a given list in Python? 

                                          The best way is to supply two given sets of values to the venn2() function, and then it will plot the Venn diagram for us. 

                                          You can also search for any dependent libraries on kandi like 'Matplotlib' and 'Matplotlib-venn'.

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