union type python 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
def infinite_stream(start: int) -> Iterator[int]:
while True:
yield start
start += 1
def infinite_stream(start: int) -> Generator[int, None, None]:
while True:
yield start
start += 1
Example 3: 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
Example 4: .union in python
set1 = {2, 4, 5, 6}
set2 = {4, 6, 7, 8}
set3 = {7, 8, 9, 10}
print("set1 U set2 : ", set1.union(set2))
print("set1 U set2 U set3 :", set1.union(set2, set3))