问题描述
由于某种原因，我无法让 matplotlib 在图例中写下 approx LaTeX 符号.
For some reason I can't get matplotlib to write down the approx LaTeX symbol in a legend.
这是一个 MWE:
import matplotlib.pyplot as plt
plt.scatter([0.5, 0.5], [0.5, 0.5], label='$U_{c} approx %0.1f$' % 22)
#plt.scatter([0.5, 0.5], [0.5, 0.5], label='$U_{c} simeq %0.1f$' % 22)
#plt.scatter([0.5, 0.5], [0.5, 0.5], label='$U_{c} sim %0.1f$' % 22)
plt.legend(fancybox=True, loc='upper right', scatterpoints=1, fontsize=16)
plt.show()
请注意，第一行不会显示 approx 字符或后面的值，但 simeq 和 sim 都可以正常工作.
Notice the first line will not show the approx character or the value after it but both simeq and sim work fine.
我刚刚在 matplotlib 的 Github 但我突然想到我可能做错了什么，所以我最好问一下.如果是，我会删除关闭它.
I've just opened a new issue in matplotlib's Github but it occurred to me that I might be doing something wrong so I better ask. If I am, I'll delete close it.
推荐答案
尝试使用原始字符串文字:r'$U_{c} approx %0.1f$'.
Try using a raw string literal: r'$U_{c} approx %0.1f$'.
In [8]: plt.scatter([0.5, 0.5], [0.5, 0.5], label=r'$U_{c} approx %0.1f$'%22)
Out[8]: <matplotlib.collections.PathCollection at 0x7f799249e550>
In [9]: plt.legend(fancybox=True, loc='best')
Out[9]: <matplotlib.legend.Legend at 0x7f79925e1550>
In [10]: plt.show()
出现这种情况的原因如下:
The reason this is happening is as follows:
如果字符串文字前面没有
r，则字符串被解释器解释为:
Without the
rinfront of the string literal, the string is interpreted by the interpreter as:
'$U_{c}' + 'a' + '大约 22.0$'
'$U_{c} ' + 'a' + 'pprox 22.0$'
'a' 是 ASCII Bell 的特殊转义字符:BEL.
The 'a' is a special escaped character for the ASCII Bell: BEL.
为确保字符串中的反斜杠 () 不会产生奇怪的转义字符，请在前面添加 r.
To make sure backslashes () in the string aren't creating weird escaped characters, add the r out front.
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