如何在matplotlib中的F弦表达式中使用乳胶；方程中没有变量
我正在尝试为情节制作标题，但是标题包括一个变量，我正在使用F-string插入该变量，但它也包括乳胶表达式。我要么遇到一个错误，即F-string表达式不采用\字符，否则它试图将方程式中的内容读取为变量，并抱怨它没有定义。
我正在尝试的代码看起来像这样：
test = 'TEST'
plt.plot(1234,5678)
plt.title(f"This is a {test}: ${\sqrt{b/a}}$")
plt.show()
此代码会给我错误：“ F-string表达式部分不能包括后斜切”，当我尝试此操作时（请注意额外的括号）：
test = 'TEST'
plt.plot(1234,5678)
plt.title(f"This is a {test}: ${{\sqrt{b/a}}}$")
plt.show()
我得到此错误：“名称“ B”不是定义的“
我希望它仅显示B/A的平方根，其中B和A只是字母，而不是变量，因此它看起来像下面的图：
但是，我似乎也无法与标题中的F弦变量一起使用。
I'm trying to make a title for a plot, but the title includes a variable, which I'm inserting using an f-string, but it also includes a Latex expression. I either get an error that f-string expressions do not take \ character, or else it's trying to read what's inside the equation as variables and complaining that it's not defined.
The code I'm trying looks something like this:
test = 'TEST'
plt.plot(1234,5678)
plt.title(f"This is a {test}: ${\sqrt{b/a}}quot;)
plt.show()
This code will give me the error: "f-string expression part cannot include a backslash", and when I try this (note the extra brackets):
test = 'TEST'
plt.plot(1234,5678)
plt.title(f"This is a {test}: ${{\sqrt{b/a}}}quot;)
plt.show()
I get this error: "name 'b' is not defined"
I want it to just show a square root of b/a, where b and a are just the letters, not variables, so that it looks something like the plot below:
but I can't seem to make it work with an f-string variable also in the title.
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必须这样做：
因为您需要使用
{和}字符，所以它们需要加倍，以便将它们解释为文字字符。这将阻止其解释括号之间的内容为Python表达式。因此，它将不再抱怨后斜线或未定义变量。另外，可以将其放入单独的字符串中，以避免将括号加倍。在我看来，这更可读。
It has to be done like this:
Since you need to use the
{and}characters, they need to be doubled up so that they are interpreted as literal characters. This will prevent it from interpreting the contents between the brackets as a Python expression. Thus, it will no longer complain about the backslash or undefined variables.Alternatively, it can be put in a separate string to avoid doubling up the brackets. This is more readable in my opinion.