Matplotlib-如何在X轴刻度标签下划线？

Question

I was trying to underline xticklabels using plot.rc but

plt.rc('text', usetex=True)
xtext = plt.xticks()
xtext[0] = tuple(r'\underline{}'.format(x) for x in xtext[0])

But the above code gives me an error `'tuple' object does not support item assignment'

Same error with:

xtext[1] = plt.text(0,0,r'\underline254')

Here, xtext[0] is an ndarray of x-axis label values and xtext[1] is an silent_list of Text xticklabel objects

How can I underline the xtick labels?

Answer 1

Consider the following solution. Here I am creating a new list of modified tick labels with underscores. Then I assign them as the new tick labels using the axis object ax and set_xticklabels . I have replaced the format with the old style of string formatting using % as for some reason, the format method underlines only the first character.

import matplotlib.pyplot as plt
from matplotlib import rc
rc('text', usetex=True)

fig, ax = plt.subplots()
plt.plot(range(5))
xtext = plt.xticks()

xtext_new = [r'\underline{%s}' %x for x in xtext[0]]
ax.set_xticklabels(xtext_new)
plt.show()