How do I escape curly-brace ({}) characters characters in a string while using .format?

Non-working example:

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

Desired output:
{Hello} 42


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 }}.

Stack Overflow Q#5466451, score: 3563