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# tag::COLUMNIZE[]

from collections.abc import Sequence

def columnize(

sequence: Sequence[str], num_columns: int = 0

) -> list[tuple[str, ...]]:

if num_columns == 0:

num_columns = round(len(sequence) ** 0.5)

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()