python define function type code example

Example 1: python function argument type

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

Example 2: python typing list of strings

from typing import List

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

Example 3: specify return type python function

def greeting(name: str) -> str:
  return 'Hello, {}'.format(name)