Question

I have made a Python script which calls functions based on user’s input. Until now I was calling argument-less functions simply through a dict

options = { 0 : func0,
            1 : func1,
            2 : func2,
           }
options[choice]()

Now I am in a situation where I need to call a few functions with arguments. I am new to Python and I tried something like this

options = { 0 : (func0,None),
            1 : (func1,None),
            2 : (func2,foo1),
            3 : (func3,foo2),
          }
options[choice][0](options[choice][1])

I am aware why None doesn’t work here, and have written it just to symbolize that the function doesn’t take any arguments. What changes should I make in the code so that it works for all kinds of functions?

I tried unpacking empty dict but it doesn’t work either.

Answer 1

None is still a value, and passing it to a function that is not expecting arguments will not work. Instead consider using partial here

from functools import partial

options = { 0: func0,
            1: func1,
            2: partial(func2, foo1),
            3: partial(func3, foo2),
          }

options[choice]()