Python typing
From wikinotes
Type annotations in python.
Example
from typing import Dict, List, Tuple, Bool class Project: def add_user(user: User) -> Bool pass def set_active(status: Bool=False) -> Bool: pass def update_metadata(data: List[Dict]) -> List[Dict]: pass
Common Types
open file objects
from typing import IO # either bytes/str def foo() -> IO: return open('foo.txt', 'r') def foo() -> IO[bytes]: return open('foo.txt', 'rb') def foo() -> IO[str]: return open('foo.txt', 'r')context managers
@contextlib.contextmanager def foo() -> Iterator[str]: print('foo') yield 'bar' print('baz')