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Python Cheatsheet 2 ​

typing ​

Union ​

py
from typing import Union

def square(x: Union[int, float]) -> float:
    return x * x

Typed Dictionary ​

py
from typing import TypedDict

class Movie(TypedDict):
    name: str
    year: int

movie = Movie(name="Avatar", year=2019)

Optional ​

py
from typing import Optional

def nice_message(name: Optional[str]) -> None:
    if name is None:
        print("Hey random person!")
    else:
        print(f"Hi there, {name}!"")
  • In the case "name" can be either String or None!
  • It cannot be anything else

Any ​

py
from typing import Any

def print_value(x: Any):
    print(x)

print_value("I pretend to be Batman in the shower sometimes")

Lambda Function ​

py
square = lambda x: x * x
square(10)
py
nums = [1, 2, 3, 4]
squares = list(map(lambda x: x * x, nums))