Iterators Generators Even Numbers.py

from typing import Generator
from typing import List

VALUES = [
    [[10, 11, 12], [13, 14, 15], [16, 17, 18]],
    [[19, 20, 21], [22, 23, 24], [25, 26, 27]],
    [[28, 29, 30], [31, 32, 33], [34, 35, 36]],
]


def get_even_for_loop(values: List) -> List[int]:
    """Return all even numbers using classical for loop.
    :param values: input list of lists with values
    :return: list with int values
    """
    res = []
    for i in range(len(values)):
        for j in range(len(values[i])):
            for k in range(len(values[i][j])):
                n = values[i][j][k]
                if n % 2 == 0:
                    res.append(n)
    return res


def get_even_for_loop_iterator(values: List) -> Generator:
    """Return all even numbers using classical "for" loop.
    :param values: input list of lists with values
    :return: generator with int values
    """
    for i in range(len(values)):
        for j in range(len(values[i])):
            for k in range(len(values[i][j])):
                n = values[i][j][k]
                if n % 2 == 0:
                    yield n


def get_even_list_comprehension(values: List) -> List[int]:
    """Return all even numbers in ONE LINE using list comprehension.
    :param values: input list of lists with values
    :return: list with int values
    """
    return [n for ll in values for l in ll for n in l if n % 2 == 0]