How to escape f-strings in python 3.6?

Question

I have a string. If I need curly braces, it further exploits the f-strings feature. Is there a language punctuation/syntax which can help me here in this case?

Here are two different ways it doesn't work. I might want to incorporate the literal text  "{bar}" as a component 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 output:

'test {bar}'

Answer 1

In spite of the fact that there is a custom syntax error from the parser, a similar trick fills in with respect to calling .format on normal strings.

Use double curlies:

>>> foo = 'test'

>>> f'{foo} {{bar}}'

'test {bar}'

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

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