On 1/25/2023 1:26 PM, Antoon Pardon wrote:
Op 23/01/2023 om 17:24 schreef Johannes Bauer:
Hi there,
is there an easy way to evaluate a string stored in a variable as if
it were an f-string at runtime?
I.e., what I want is to be able to do this:
x = { "y": "z" }
print(f"-> {x['y']}")
This prints "-> z", as expected. But consider:
x = { "y": "z" }
s = "-> {x['y']}"
print(s.format(x = x))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: "'y'"
Even though
s = "-> {x}"
print(s.format(x = x))
Prints the expected "-> {'y': 'z'}".
I am probably missing something but is there a reason why the following
wouldn't do what you want:
x = { "y": "z" }
s = "-> {target}"
print(s.format(target = x['y']))
Stack overflow to the rescue:
Search phrase: "python evaluate string as fstring"
https://stackoverflow.com/questions/47339121/how-do-i-convert-a-string-into-an-f-string
def effify(non_f_str: str):
return eval(f'f"""{non_f_str}"""')
print(effify(s)) # prints as expected: "-> z"
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