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I have a string in which I would like curly-brackets, but also take advantage of the f-strings feature. Is there some syntax that works for this?
Here are two ways it does not work. I would like to include the literal text {bar} as part 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 result:
'test {bar}'
Edit: Looks like this question has the same answer as How can I print literal curly-brace characters in a string and also use .format on it?, but you can only know that if you know that str.format uses the same rules as the f-string. So hopefully this question has value in tying f-string searchers to this answer.
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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 }} .
To remove square brackets from the beginning and end of a string using Python, we pass “[]” to the strip() function as shown below. If you have curly brackets as well, we pass “[]{}” to strip() to remove the brackets.
The curly braces show where the inserted value should go. You can insert more than one value. The values do not have to be strings, they can be numbers and other Python objects. >>>
Easily my favorite advanced feature in Python, rather than relying on whitespace to denote scopes (boring) — we can use curly braces!
Now, what if we need to escape curly braces in f-strings in Python. For this, there is a simple fix of using two curly braces instead of one. This way, we can print the curly braces in the output. However, this way we cannot provide the missing values.
If you use Python version 3.9.0a4 or greater, then you can directly use: How to escape curly-brackets in f-strings? StackOverflow: Questions
String formatting is also used for replacing and filling in missing values. Python 3.6 introduced a new method to format strings called f-strings. The f-strings provide a quick and efficient way to format strings in Python. It is considered faster than the other methods of format () function and the % operator.
Although there is a custom syntax error from the parser, the same trick works as for calling .format on regular strings.
Use double curlies:
>>> foo = 'test'
>>> f'{foo} {{bar}}'
'test {bar}'
It's mentioned in the spec here and the docs here.
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