string_concatenation_vs_joining.py

from timeit import Timer


def concatenation(sequence):
    result = ''
    for char in sequence:
        result += char
    return result


def joining(sequence):
    return ''.join(sequence)


def create_timer(func, sequence):
    timer = Timer(
        f'{func.__name__}(sequence)',
        f'from __main__ import {func.__name__}',
        globals=dict(sequence=sequence)
    )
    return timer


def main(*numbers, as_tuple=False):
    row_format = '{:<25}' * (len(numbers) + 1)
    print(row_format.format('Method / Number', *numbers))
    for func in (concatenation, joining):
        sequence = ('s' for _ in range(1000))
        if as_tuple:
            sequence = tuple(sequence)

        timer = create_timer(func, sequence)

        results = {}
        for number in numbers:
            results[number] = timer.timeit(number=number)

        print(row_format.format(func.__name__, *results.values()))


if __name__ == '__main__':
    numbers = 100, 1000, 10000

    print('Sequence as tuple')
    main(*numbers, as_tuple=True)

    print('\nSequence as generator')
    main(*numbers, as_tuple=False)