python type specification code example
Example 1: python function argument type
def pick(l: list, index: int) -> int:
return l[index]
Example 2: python type hint list
x: List[int] = [1]
x: Set[int] = {6, 7}
x: int = 1
x: float = 1.0
x: bool = True
x: str = "test"
x: bytes = b"test"
Example 3: type declaration python
def greeting(name: str) -> str:
return 'Hello ' + name
Example 4: python optional type annotation
from custom_module import SomeClass
from typing import Optional
class SubClass:
a_reference: Optional[SomeClass]
def __init__(self):
self.a_reference = None