Bug summary

It was supposed to rotate the xticklabes with clauses:

xticks = ax.get_xticks()
xticklabes = ax.get_ticklabels()
ax.set_xticks(xticks)
ax.set_xticklabels(xticklabels, rotation=90)

But it got empty xticklables as a result.

Code for reproduction

Snippet 1:

import matplotlib.pyplot as plt
import numpy as np

y = np.arange(10)
ax = plt.subplot()
ax.plot(y)
xticks = ax.get_xticks()
xticklabels = ax.get_xticklabels()
ax.set_xticks(xticks)

Snippet 2:

import matplotlib.pyplot as plt
import numpy as np

y = np.arange(10)
ax = plt.subplot()
ax.plot(y)
xticks = ax.get_xticks()
xticklabels = ax.get_xticklabels()
ax.set_xticks(xticks)
ax.set_xticklabels(xticklabes, rotation=90)

Actual outcome

As the result of Snippet 1, variable xticklabels got correct result of current plot.
But when it came to Snippet 2, xticklabels became empty []. And plot show no xticklabes.

Expected outcome

outcome of snippet 1:

outcome of snippet 2:

Additional information

No response

Operating system

Windows 10

Matplotlib Version

3.5.2

Matplotlib Backend

No response

Python version

3.8.10

Jupyter version

3.0.6

Installation

pip