[Tutor] Using string formatting inside function docstrings

[boB Stepp]

On Sat, Apr 11, 2020 at 12:57 AM boB Stepp <robertvstepp at gmail.com> wrote:

> This runs:
>
> def fmt(*args):
>     """Prints arguments of %s.""" % args[0]
>     for i, arg in enumerate(args):
>         print("arg #%s = %s " % (i, arg), end="")
>     print()
>
>
> fmt("Robert", "V.", "Stepp")
>
> Giving:
>
> bob at Dream-Machine1:~/Projects/Tutor_Help$ python3 s*
> arg #0 = Robert arg #1 = V. arg #2 = Stepp
>
> But my original idea of using this for the docstring:
>
> """Prints arguments of %s.""" % args
>
> Throws an exception:
>
> bob at Dream-Machine1:~/Projects/Tutor_Help$ python3 s*
> Traceback (most recent call last):
>   File "str_fmt.py", line 11, in <module>
>     fmt("Robert", "V.", "Stepp")
>   File "str_fmt.py", line 5, in fmt
>     """Prints arguments of %s.""" % args
> TypeError: not all arguments converted during string formatting

Ah, I see why now.  There is only one "%s", but it is expecting three
"%s" based on the number of arguments passed in.  It is too late to be
trying to be too clever!


-- 
boB