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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()

Output:


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