How can I display text over columns in a bar chart in Matplotlib?

To display text over columns in a bar chart, we can use the text() method to place text at specific coordinates above each bar. This is useful for showing values, percentages, or labels directly on the chart.

Basic Example

Here's how to add text labels above bar chart columns ?

import matplotlib.pyplot as plt

# Data for the chart
categories = ['A', 'B', 'C', 'D', 'E']
values = [1, 3, 2, 0, 4]
percentages = [10, 30, 20, 0, 40]

# Create bar chart
bars = plt.bar(categories, values)

# Add text above each bar
for i, (cat, val, pct) in enumerate(zip(categories, values, percentages)):
    plt.text(i, val + 0.1, f'{pct}%', ha='center', va='bottom')

plt.xlabel('Categories')
plt.ylabel('Values')
plt.title('Bar Chart with Text Labels')
plt.show()

Customizing Text Position and Style

You can customize the appearance and position of the text labels ?

import matplotlib.pyplot as plt

categories = ['Jan', 'Feb', 'Mar', 'Apr', 'May']
sales = [250, 380, 420, 310, 460]

bars = plt.bar(categories, sales, color='skyblue', alpha=0.7)

# Add styled text labels
for i, (cat, sale) in enumerate(zip(categories, sales)):
    plt.text(i, sale + 10, f'${sale}', 
             ha='center', va='bottom', 
             fontweight='bold', fontsize=10)

plt.xlabel('Month')
plt.ylabel('Sales ($)')
plt.title('Monthly Sales with Value Labels')
plt.ylim(0, max(sales) + 50)  # Add space for text
plt.show()

Text Alignment Options

The ha (horizontal alignment) and va (vertical alignment) parameters control text positioning ?

Adding Text Inside Bars

You can also place text inside the bars by adjusting the y-coordinate ?

import matplotlib.pyplot as plt

products = ['Product A', 'Product B', 'Product C', 'Product D']
revenue = [1200, 800, 1500, 600]

bars = plt.bar(products, revenue, color=['red', 'green', 'blue', 'orange'])

# Add text inside bars (at half height)
for i, (product, rev) in enumerate(zip(products, revenue)):
    plt.text(i, rev/2, f'${rev}', 
             ha='center', va='center', 
             color='white', fontweight='bold')

plt.xlabel('Products')
plt.ylabel('Revenue ($)')
plt.title('Product Revenue with Internal Labels')
plt.xticks(rotation=45)
plt.tight_layout()
plt.show()

Key Points

• Use plt.text(x, y, text) to add labels at specific coordinates
• Set ha='center' and va='bottom' for labels above bars
• Add padding to y-coordinates (like val + 0.1) to avoid overlap
• Use plt.ylim() to ensure text labels are visible

Conclusion

The text() method provides flexible control over label placement in bar charts. Use proper alignment and positioning to create clear, readable charts with informative text labels.