# tag::COLUMNIZE[]
from typing import Sequence, List, Tuple

def columnize(sequence: Sequence[str], num_columns: int = 0) -> List[Tuple[str, ...]]:
    if num_columns == 0:
        num_columns = round(len(sequence) ** .5)
    num_rows, reminder = divmod(len(sequence), num_columns)
    num_rows += bool(reminder)
    return [tuple(sequence[i::num_rows]) for i in range(num_rows)]
# end::COLUMNIZE[]


def demo() -> None:
    nato = ('Alfa Bravo Charlie Delta Echo Foxtrot Golf Hotel India'
            ' Juliett Kilo Lima Mike November Oscar Papa Quebec Romeo'
            ' Sierra Tango Uniform Victor Whiskey X-ray Yankee Zulu'
            ).split()

    for row in columnize(nato, 4):
        for word in row:
            print(f'{word:15}', end='')
        print()


if __name__ == '__main__':
    demo()