python typevar code example

Example 1: python typing list of strings

from typing import List

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

Example 2: typing generator python

# Iterator
def infinite_stream(start: int) -> Iterator[int]:
    while True:
        yield start
        start += 1

# Generator        
def infinite_stream(start: int) -> Generator[int, None, None]:
    while True:
        yield start
        start += 1

Example 3: type declaration python

def greeting(name: str) -> str:
    return 'Hello ' + name

Example 4: python type constraint

# Example of typing constraint in python (From 3.5)
def greeting(name: str) -> str:
    return 'Hello ' + name

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