python typing hints for non return functions code example

Example 1: python typing void function

def function(param: str) -> None:
  # A function that doesn't return anything,
  # has None as return type.
  print("hey")

Example 2: python optional type annotation

from custom_module import SomeClass
from typing import Optional

class SubClass:
    a_reference: Optional[SomeClass] # Provides info that a_reference may be 'None'.

    def __init__(self):
        self.a_reference = None

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