Matplotlib: Making Titles Bold

Matplotlib is a popular plotting library in Python that allows you to create various types of plots and graphs. One common customization that users often want to make is to make the titles of their plots bold for better visibility and emphasis. In this article, we will explore how to make titles bold in Matplotlib using different methods and examples.

Method 1: Using Matplotlib’s `FontProperties` class

import matplotlib.pyplot as plt
from matplotlib.font_manager import FontProperties

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.title('Bold Title Example', fontproperties=FontProperties(weight='bold'))
plt.show()

Output:

Method 2: Using `set_fontweight` method

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.title('Bold Title Example')
plt.gca().title.set_fontweight('bold')
plt.show()

Output:

Method 3: Using `set_fontweight` method and `weight` parameter

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
title_obj = plt.title('Bold Title Example')
plt.setp(title_obj, fontweight='bold')
plt.show()

Output:

Method 4: Using `fontweight` parameter in `title` function

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.title('Bold Title Example', fontweight='bold')
plt.show()

Output:

Method 5: Using Matplotlib’s `text` function

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.text(2, 18, 'Bold Title Example', weight='bold')
plt.show()

Output:

Method 6: Using `set_text` method of title object

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
title_obj = plt.title('Bold Title Example')
title_obj.set_text('Bold Title Example')
title_obj.set_fontweight('bold')
plt.show()

Output:

Method 7: Using `set_fontweight` method of title object

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
title_obj = plt.title('Bold Title Example')
title_obj.set_fontweight('bold')
plt.show()

Output:

Method 8: Using `set_fontweight` method with `get_text` function

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
title_obj = plt.title('Bold Title Example')
title_obj.set_fontweight('bold')
title_obj.set_text(title_obj.get_text())
plt.show()

Output:

Method 9: Using `set_fontweight` method with `set_text` function

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
title_obj = plt.title('Bold Title Example')
title_obj.set_fontweight('bold')
title_obj.set_text('Bold Title Example')
plt.show()

Output:

Method 10: Using `set_text` method with `set_fontweight` function

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
title_obj = plt.title('Bold Title Example')
title_obj.set_text('Bold Title Example')
title_obj.set_fontweight('bold')
plt.show()

Output:

In this article, we have explored various methods to make titles bold in Matplotlib. Whether you use the FontProperties class, set_fontweight method, fontweight parameter, text function, or a combination of these methods, you can easily customize the appearance of your plot titles to make them stand out. Experiment with these methods to find the best approach for your plotting needs!