matplotlib：在文本框中使用LaTeX时覆盖字符串中的下划线

Question

I need to write in the text box of a plot, and within a LaTeX environment (since I also need to write some math code), the name of a variable that contains an underscore.

The problem is that LaTeX interprets the underscore in the variable's name as a subindex command, and the name of the variable is distorted. See (MWE below):

where the name of the variable is m_out .

How can I write a string containing an underscore without LaTeX interpreting it as the subindex command?

In pure LaTeX I could use the \\textunderscore command to write:

N = m \textunderscore out \pm 0.2

which correctly produces:

but this doesn't seem to work here.

---

MWE

import matplotlib.pyplot as plt
import matplotlib.offsetbox as offsetbox
import random

# Generate random data.
x = [random.random() for i in xrange(10)]
y = [random.random() for i in xrange(10)]

# Define string with underscore.
name = 'm_out'

# Create plot.
fig = plt.figure()
ax = plt.subplot()

# Add text box
text = r'$N={}\pm0.2$'.format(name)
ob = offsetbox.AnchoredText(text, loc=1, prop=dict(size=12))
ax.add_artist(ob)
plt.scatter(x, y)

# Save plot to file.
fig.tight_layout()
plt.savefig('out.png')

Answer 1

A simple escape does the trick:

name = 'm\_out'