如何在字符串中打印文字花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 = " { 你好 } {0} "打印(x.格式(42))

给我:关键错误:Hello\

我想打印输出:{Hello} 42

解决方案

你需要把{{和}}加倍:

<预><代码>>>>x = " {{ 你好 }} {0} ">>>打印(x.格式(42))' {你好 } 42 '

以下是格式字符串语法的 Python 文档的相关部分:

<块引用>

格式字符串包含用大括号 {} 包围的替换字段".大括号中未包含的任何内容都被视为文字文本，将原样复制到输出中.如果需要在原义文本中包含大括号字符，可以通过加倍转义:{{ 和 }}.

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

gives me : Key Error: Hello\

I want to print the output: {Hello} 42

解决方案

You need to double the {{ and }}:

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

Here's the relevant part of the Python documentation for format string syntax:

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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