Function always missing 1 required positional argument when stored in a list

Question

I want to store functions in a list and then later in a program call those functions from that list with values also stored on that list.

Example:

import random
import time

ranges = 23,24
my_functions_and_values = [[random.randint, ranges], [time.sleep, 2]]

for i in my_functions_and_values:
    i[0](i[1])

But it gives me the following error:

TypeError: randint() missing 1 required positional argument: 'b'

Andrej Kesely · Accepted Answer · 2020-05-29 18:53:09Z

1

You can store the parameters to functions as tuples (so 2 will become (2, )). Then when you call the function do parameter unpacking with *:

import random
import time

ranges = 23,24
my_functions_and_values = [[random.randint, ranges], [time.sleep, (2, )]]

for i in my_functions_and_values:
    i[0](*i[1])

answered May 29, 2020 at 18:53

Andrej Kesely

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