[Tutor] Feed arguments to callback(?) function

[Sarfraaz Ahmed]

I think you have to unpack the dictionary using ** while passing it as a
bunch of arguments to the transform function

        roll = self._die(**self._die_args)  # added **

On Tue, Jun 6, 2023 at 1:35 PM trent shipley <trent.shipley at gmail.com>
wrote:

> I want to take and arbitrary probability distribution function, send it
> it's keyword arguments, and run it as the core of a generic dice rolling
> program in Python (so it is accessible to the maximum number of
> programmers),
>
>
> # hackable_dice_roller
> # from typing import Any, List, Tuple, Callable
> from random import normalvariate, randrange, seed
> # import operator
>
>
> class DieRoll:
>     def __init__(self,
>                  die,  # a probability input function
>                  transform=None, # a function to transform the result
> returned by the PDF
>                  **die_args):  # Keyword:Value arguments to the PDF python
> function (doesn't work)
>         self._die = die
>         self._transform = transform
>         self._die_args = die_args
>
>     def die_roll(self):
>         roll = self._die(self._die_args)  # throws error
>         if self._transform is not None:
>             roll = self._transform(roll)
>         return roll
>
>
> class IntegerDieRoll(DieRoll):
>     def __init__(self,
>                  transform=None,
>                  sides=6,
>                  bottom=1):
>         super().__init__(die=randrange,  # a random module pdf
>                          transform=transform,
>                          start=bottom,  # say 1 on a 6 sided die
>                          stop=bottom + sides,  # 1 + 6 = 7, randrange
> should return value 1 to 6 inclusive
>                          step=1)
>         if sides <= 0:
>             raise ValueError("Parameter 'die' must be at least 1")
>
>     def die_roll(self):
>         return int(super().die_roll())
>
> if __name__ == '__main__':
>     seed(0)
>
>     integer_die_roll = IntegerDieRoll()
>     print(integer_die_roll.die_roll())
>
> ----------
>
> Traceback (most recent call last):
>   File "/usr/lib/python3.11/random.py", line 295, in randrange
>     istart = _index(start)
>              ^^^^^^^^^^^^^
> TypeError: 'dict_values' object cannot be interpreted as an integer
>
> During handling of the above exception, another exception occurred:
>
> Traceback (most recent call last):
>   File
> "/home/trent/pythonworkspace/hackable_dice_roller/roll_instruction.py",
> line 85, in <module>
>     print(integer_die_roll.die_roll())
>           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   File
> "/home/trent/pythonworkspace/hackable_dice_roller/roll_instruction.py",
> line 41, in die_roll
>     return int(super().die_roll())
>                ^^^^^^^^^^^^^^^^^^
>   File
> "/home/trent/pythonworkspace/hackable_dice_roller/roll_instruction.py",
> line 21, in die_roll
>     roll = self._die(self._die_args.values())
>            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   File "/usr/lib/python3.11/random.py", line 297, in randrange
>     istart = int(start)
>              ^^^^^^^^^^
> TypeError: int() argument must be a string, a bytes-like object or a real
> number, not 'dict_values'
>
> Process finished with exit code 1
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-- 
        Jazaak Allahu Khair
               -- Sarfraaz Ahmed