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Say I have a function
def foo(): return [1, 2, 3]
I want to interpolate the result of the function into a string to get "001 002 003". I've tried this:
f"{*foo():03d 03d 03d}"
But it produced SyntaxError: can't use starred expression here. Can I do this using an f-string?
418
text2 = F"This is the {second} string." As you can see in the example, curly braces have been used twice in f-strings. Expressions and variables inside curly braces within f-strings are evaluated by Python and then they are substituted with the results returned by the original expressions.
To convert a list to a string, use Python List Comprehension and the join() function. The list comprehension will traverse the elements one by one, and the join() method will concatenate the list's elements into a new string and return it as output.
The most obvious usage of F strings is to interpolate simple values inside of throws, output, what have you. This is done using the {} syntax and just providing that values name. The value will also be implicitly casted if it is possible, of course.
We can also call functions in f-strings. The example calls a custom function in the f-string.
is this what you are looking for?
str_repr = ' '.join(map('{:03d}'.format, foo()))
print(str_repr) # prints: 001 002 003
maybe the best thing about this solution is that it works with any list length and with minimal tweaking you can change the output format too.
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