f-string capability in a function

[snippsat]

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~~~