How do you add a border to a histogram in python?

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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

from matplotlib import pyplot as plt

import numpy as np

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)

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

from matplotlib import pyplot as plt

import numpy as np

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])

ax.hist(a, edgecolor = "black", color = 'pink')

ax.hist(b, edgecolor = "red", color = 'gray')

ax.set_title("Histogram - Geekforgeeks")

plt.show()

Output: