Bar Chart

Code

import matplotlib.pyplot as plt
import numpy as np

categories = ["A", "B", "C", "D"]
values = [23, 45, 12, 67]

plt.bar(categories, values, color="steelblue", edgecolor="black")
plt.title("Sales by category")
plt.ylabel("units")
plt.show()

# Horizontal bars
plt.barh(categories, values, color="coral")
plt.xlabel("units")
plt.show()

# Grouped bars
x = np.arange(len(categories))
plt.bar(x - 0.2, values, 0.4, label="2023")
plt.bar(x + 0.2, [30, 40, 20, 50], 0.4, label="2024")
plt.xticks(x, categories)
plt.legend()
plt.show()

Explanation

bar() and barh() render vertical or horizontal bars, accepting scalar or array colors and edge styling. Grouped bars use offset x positions to place multiple series side by side, with xticks restoring the category labels. Width and offsets control how bars are spaced.

More Matplotlib Snippets