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sample.py

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# tag::SAMPLE[]

from collections.abc import Sequence

from random import shuffle

from typing import 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()