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Set the font size for one pie chart
When you create a chart with fig, ax = plt.subplots(), set the title directly on its Axes. Matplotlib describes Axes.set_title as setting a title for the Axes.
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import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.pie([40, 35, 25], labels=["A", "B", "C"])
ax.set_title("My pie chart", fontsize=16)
plt.show()The numeric value gives the title size in points. You can also use a relative size such as "large" instead of a number.
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If your code uses pyplot’s stateful interface, pass fontsize to plt.title():
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plt.pie([40, 35, 25], labels=["A", "B", "C"])
plt.title("My pie chart", fontsize=16)
plt.show()Matplotlib documents plt.title() as a wrapper for Axes.set_title(). It sets the title on the current Axes. If a figure has multiple Axes, use ax.set_title() to specify which chart receives the title.
Set a default size for Axes titles
To change the default inherited by Axes titles, set axes.titlesize before creating those titles:
plt.rcParams["axes.titlesize"] = 16This changes the default for Axes titles in the active Matplotlib configuration; it is broader than setting fontsize on one title. See Matplotlib’s customization documentation.
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Distinguish an Axes title from a figure title
If the heading you want to resize belongs to the entire figure rather than the pie chart’s Axes, set the figure-level title with fig.suptitle():
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fig.suptitle("My figure", fontsize=16)This controls a different title scope from ax.set_title(). If changing the Axes title size does not affect the visible heading, check whether the code created it with fig.suptitle(). Matplotlib documents this method in its Figure API.
Why plt.pie() has no title font-size argument
plt.pie() draws the pie chart; the title is a separate Axes or figure element. Set its size through the relevant title method’s fontsize keyword, rather than passing a title-size argument to pie(). Passing fontsize directly is the concise option; Matplotlib’s pyplot title API discourages using fontdict.
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