Re: Evaluation of variable as f-string

[Antoon Pardon]

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']))
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