python typing type from bellow code example
Example 1: python typing list of strings
from typing import List
def my_func(l: List[int]):
pass
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