如何在 f 字符串中转义花括号? [英] How to escape curly-brackets in f-strings?

问题描述

我有一个字符串，我想在其中使用大括号，但也要利用 f-strings 功能.是否有一些适用于此的语法?

这里有两种方法不起作用.我想包含文字文本 {bar} 作为字符串的一部分.

foo = "test";fstring = f"{foo} {bar}";

NameError: name 'bar' 未定义

fstring = f"{foo} {bar}";

SyntaxError: f-string 表达式部分不能包含反斜杠

想要的结果:

'test {bar}'

看起来这个问题的答案与 如何在字符串中打印文字花括号字符并在其上使用 .format ?，但只有知道 才能知道这一点str.format 使用与 f-string 相同的规则.所以希望这个问题在将 f-string 搜索者与这个答案联系起来方面具有价值.

解决方案

尽管解析器存在自定义语法错误，相同技巧 与在常规字符串上调用 .format 一样工作.

使用双卷曲:

<预><代码>>>>foo = '测试'>>>f'{foo} {{bar}}''测试 {bar}'

它在规范这里和文档此处.

I have a string in which I would like curly-brackets, but also take advantage of the f-strings feature. Is there some syntax that works for this?

Here are two ways it does not work. I would like to include the literal text {bar} as part of the string.

foo = "test"
fstring = f"{foo} {bar}"

NameError: name 'bar' is not defined

fstring = f"{foo} {bar}"

SyntaxError: f-string expression part cannot include a backslash

Desired result:

'test {bar}'

Edit: Looks like this question has the same answer as How can I print literal curly-brace characters in a string and also use .format on it?, but you can only know that if you know that str.format uses the same rules as the f-string. So hopefully this question has value in tying f-string searchers to this answer.

解决方案

Although there is a custom syntax error from the parser, the same trick works as for calling .format on regular strings.

Use double curlies:

>>> foo = 'test'
>>> f'{foo} {{bar}}'
'test {bar}'

It's mentioned in the spec here and the docs here.

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