from typing import Optional, List, Tuple

def function(param1: Optional[int], param2: List[int]):
     print(param1, param2)

>>> function(None, [12, 45, 1])
#None [12, 45, 1]
# For this example, param1 had an input of None, while 
# param2 had a parameter of type List inputted. 
# The function's output reflects this.

>>> function(12, [1, 2])
#12 [1,2]
# For this example, param1 had an input of type int, while 
# param2 had a parameter of type List inputted. 
# The function's output reflects this.

Type annotations made for each parameter will return a TypeError if the parameter is not of the correct type.