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I'm trying to pull a string from JSON, then convert it to an f string to be used dynamically. Example Assigned from JSON I get

whose_fault= "{name} started this whole mess"

How to build a lambda to convert it to an f-string and insert the given variable? I just can't quite get my head around it. I know similar questions have been asked, but no answer seems to quite work for this.

Better question. What's the most pythonic way to insert a variable into a string (which cannot be initially created as an f-string)? My goal would be a lambda function if possible. The point being to insert the same variable into whatever string is given where indicated said string.

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  • f-strings allow arbitrary code execution. Someone can make an f-string install ransomware or email your customers' private data to Nigeria. This is a bad idea - use something else. Commented Jan 2, 2021 at 15:49
  • I don't do Python, but as far as I can tell, an f-string is a string literal that supports interpolation as part of the literal syntax. As such, it's a source code construct. You can't create one dynamically at runtime (if I'm reading correctly) (unless Python has a means of allowing you to execute code in a string, which would be problematic from a security standpoint). Commented Jan 2, 2021 at 15:50
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    There is no such thing as f-string in python. Its just a feature to allow you execute a code instead of using concatination. So if you have a variable x= 1011, then you can create another string that contains the variable x in it. Like y = f"its now {x*2}", now y is a string. not a function or a type Commented Jan 2, 2021 at 15:52

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There is no such thing as f-string type object in python. Its just a feature to allow you execute a code and format a string. So if you have a variable x= 2020, then you can create another string that contains the variable x in it. Like

y = f"It is now {x+1}". Now y is a string, not a new object type,not a function

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