How to Correctly Modify Matplotlib Tick Label Text?

Modifying Tick Label Text

When modifying tick labels in a plot, setting the text directly using label.set_text() is ineffective. Instead, you need to redraw the canvas to ensure the labels are positioned and assigned values:

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
fig.canvas.draw()

labels = [item.get_text() for item in ax.get_xticklabels()]
labels[1] = 'Testing'

ax.set_xticklabels(labels)
plt.show()

Matplotlib avoids static positioning to allow interactive adjustments. By default, tick labels are dynamically updated by the axis's Locator and Formatter. To make labels static, use FixedLocator and FixedFormatter.

Alternatively, consider using annotate to annotate specific positions instead of modifying tick labels.

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