how to specify argument type in python code example

Example 1: python function argument type

def pick(l: list, index: int) -> int:
    return l[index]

Example 2: how to set the type of the arguments functions in pytohn

def showPrompt(symbol :str, container :str) -> None:
    while container.lower() != "exit":
        container = str(input(symbol))

Example 3: python typing list of strings

from typing import List

def my_func(l: List[int]):
    pass

Example 4: 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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Misc Example

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