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Add a border around histogram bars in Matplotlib
• Last Updated : 24 Jan, 2021

Prerequisites: Matplotlib

In this article, we will see how can we can add a border around histogram bars in our graph using matplotlib, Here we will take two different examples to showcase our graph.

Approach:

• Import required module.
• Create data.
• Add border around histogram bars.
• Normally plot the data.
• Display plot.

Below is the Implementation:

Example 1:

In this example, we will Pass an edgecolor = ‘Black’ value as the edge color parameter to plt.hist() to change the bar border color.

## Python3

 `# importing package``from` `matplotlib ``import` `pyplot as plt``import` `numpy as np`` ` `#create data``fig,ax ``=` `plt.subplots(``1``,``1``)``a ``=` `np.array([``22``, ``87``, ``5``, ``43``, ``56``, ``73``, ``55``,``              ``54``, ``11``, ``20``, ``51``, ``5``, ``79``, ``31``, ``27``])`` ` `b ``=` `(``0``, ``25``, ``50``, ``75``, ``100``)`` ` `# Adjust the border color``ax.hist(a, b, edgecolor ``=` `"black"``)`` ` `ax.set_title(``"histogram - Geekforgeeks"``)``ax.set_xlabel(``'Litracy Level(%)'``)``ax.set_ylabel(``'Population(million)'``)`` ` `plt.show()`

Output: Example 2:

In this example, we will Pass a two edge color, edgecolor = ‘Black’ and ‘red’ value as the edge color parameter to plt.hist() to change the bar border color.

## Python3

 `# importing package``from` `matplotlib ``import` `pyplot as plt``import` `numpy as np`` ` `#create data``fig,ax ``=` `plt.subplots(``1``, ``1``)`` ` `a ``=` `np.array([``20``, ``73``, ``55``, ``31``, ``51``, ``5``, ``79``, ``5``,``              ``43``, ``22``, ``87``, ``54``, ``11``, ``56``, ``27``])`` ` `b ``=` `np.array([``0``, ``25``, ``50``, ``75``, ``100``])`` ` `# Adjust the border color``ax.hist(a, edgecolor ``=` `"black"``, color ``=` `'pink'``)``ax.hist(b, edgecolor ``=` `"red"``, color ``=` `'gray'``)`` ` `ax.set_title(``"Histogram - Geekforgeeks"``)``plt.show()`

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