如何在字符串中打印文字大括号字符并在其上使用.format? [英] How can I print literal curly-brace characters in a string and also use .format on it?

问题描述

x = " \{ Hello \} {0} "
print(x.format(42))

给我:关键错误:Hello \\

我要打印输出: {Hello} 42

推荐答案

您需要将 {{{和}} 翻倍:

>>> x = " {{ Hello }} {0} "
>>> print(x.format(42))
' { Hello } 42 '

这是 Python文档中有关格式字符串语法的相关部分:

格式字符串包含用花括号 {} 包围的替换字段".花括号中不包含的所有内容均视为文字文本，该文本原样复制到输出中.如果您需要在文字文本中包含大括号字符，可以通过以下操作将其转义: {{{ and }} .

Format strings contain "replacement fields" surrounded by curly braces {}. Anything that is not contained in braces is considered literal text, which is copied unchanged to the output. If you need to include a brace character in the literal text, it can be escaped by doubling: {{ and }}.

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