35 lines
735 B
Python
35 lines
735 B
Python
# tag::SAMPLE[]
|
|
from random import shuffle
|
|
from typing import Sequence, List, TypeVar
|
|
|
|
T = TypeVar('T')
|
|
|
|
def sample(population: Sequence[T], size: int) -> List[T]:
|
|
if size < 1:
|
|
raise ValueError('size must be >= 1')
|
|
result = list(population)
|
|
shuffle(result)
|
|
return result[:size]
|
|
# end::SAMPLE[]
|
|
|
|
def demo() -> None:
|
|
import typing
|
|
p1 = tuple(range(10))
|
|
s1 = sample(p1, 3)
|
|
if typing.TYPE_CHECKING:
|
|
reveal_type(p1)
|
|
reveal_type(s1)
|
|
print(p1)
|
|
print(s1)
|
|
p2 = 'The quick brown fox jumps over the lazy dog'
|
|
s2 = sample(p2, 10)
|
|
if typing.TYPE_CHECKING:
|
|
reveal_type(p2)
|
|
reveal_type(s2)
|
|
print(p2)
|
|
print(s2)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
demo()
|