如何在字符串中打印文字curlybrace字符并在其上使用.format？

Question

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

给我：Key Error: Hello\\

我想打印输出：{Hello} 42

Answer 1

您需要将{{和}}加倍：

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

以下是Python documentation for format string syntax的相关部分：

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 }}.