f-string capability in a function

[Skaperen]

That is an interesting puzzle. After a lot of tries I succeeded in producing a working example.

>>> string_from_file = 'f"Printing {var1}"'
>>> string_from_file
'f"Printing {var1}"'
>>> var1 = "content of variable"
>>> exec('print(eval(string_from_file))')
Printing content of variable
>>> 

Although this works I would prefer using string.format(). But I am sure you thought about that already.

i don't necessarily want to print it. maybe i want to pass the result, and some there values, to a function or method. maybe the result is meant to be a file name.

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Maybe you want to use some existing tools: https://palletsprojects.com/p/jinja/

BTW: Merry Christmas

i don't see how Jinja, or any template engine, could achieve this.

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I agree look into jinja,sometime it easy to forget that is stand alone and very powerful,not only for web templating.

from jinja2 import Template

def multi_str(word, numb):
    return f' '.join([f'{word.upper():~^21}'] * numb)

from_file = "Hello {{ multi_str('Merry Christmas', 3) }}"
template = Template(from_file)
print(template.render(multi_str=multi_str))
# or
#print(template.render({'multi_str': multi_str}) 

Output:
Hello ~~~MERRY CHRISTMAS~~~ ~~~MERRY CHRISTMAS~~~ ~~~MERRY CHRISTMAS~~~

my goal had nothing to do with web templating.