История изменений

import timeit


iterations = 10000

xs = [(0, 10.8), (1, 8.2), (2, 0.3)]
ys = [(0, 0.4), (3, 20.2), (2, 0.3)]


def one_imperative(a, b):
    c = a + b
    keys = set(map(lambda x: x[0], c))

    result = []
    for key in keys:
        summ = 0
        for x in c:
            if x[0] == key:
                summ += x[1]
        result.append((key, summ))

    return sorted(result, key=lambda x: x[1], reverse=True)


def one_pythonic(a, b):
    c = a + b
    keys = set(map(lambda x: x[0], c))

    result = [(key, sum([x[1] for x in c if x[0] == key])) for key in keys]

    return sorted(result, key=lambda x: x[1], reverse=True)


def two(xs, ys):
    sum_dict = {x[0]: x[1] + y[1] for x in xs for y in ys if x[0] == y[0]}

    result_dict = {**dict(xs), **dict(ys), **sum_dict}

    result = [(k, v) for k,v in result_dict.items()]

    return sorted(result, key=lambda x: x[1], reverse=True)


time_one_imperative = timeit.timeit("one_imperative(xs, ys)", "from __main__ import xs, ys, one_imperative", number=iterations)
time_one_pythonic = timeit.timeit("one_pythonic(xs, ys)", "from __main__ import xs, ys, one_pythonic", number=iterations)
time_two = timeit.timeit("two(xs, ys)", "from __main__ import xs, ys, two", number=iterations)

print("One imperative: ", time_one_imperative)
print("One pythonic: ", time_one_pythonic)
print("Two: ", time_two)

One imperative:  0.18978183099534363
One pythonic:  0.25368363698362373
Two:  0.1737681599915959

import timeit


iterations = 10000

xs = [(0, 10.8), (1, 8.2), (2, 0.3)]
ys = [(0, 0.4), (3, 20.2), (2, 0.3)]


def one_imperative(a, b):
    c = a + b
    keys = set(map(lambda x: x[0], c))

    result = []
    for key in keys:
        summ = 0
        for x in c:
            if x[0] == key:
                summ += x[1]
        result.append((key, summ))

    return sorted(result, key=lambda x: x[1], reverse=True)


def one_pythonic(a, b):
    c = a + b
    keys = set(map(lambda x: x[0], c))

    result = [(key, sum([x[1] for x in c if x[0] == key])) for key in keys]

    return sorted(result, key=lambda x: x[1], reverse=True)

def two(xs, ys):
    sum_dict = {x[0]: x[1] + y[1] for x in xs for y in ys if x[0] == y[0]}

    result_dict = {**dict(xs), **dict(ys), **sum_dict}

    result = [(k, v) for k,v in result_dict.items()]

    return sorted(result, key=lambda x: x[1], reverse=True)


time_one_imperative = timeit.timeit("one_imperative(xs, ys)", "from __main__ import xs, ys, one_imperative", number=iterations)
time_one_pythonic = timeit.timeit("one_pythonic(xs, ys)", "from __main__ import xs, ys, one_pythonic", number=iterations)
time_two = timeit.timeit("two(xs, ys)", "from __main__ import xs, ys, two", number=iterations)

print("One imperative: ", time_one_imperative)
print("One pythonic: ", time_one_pythonic)
print("Two: ", time_two)

One imperative:  0.18978183099534363
One pythonic:  0.25368363698362373
Two:  0.1737681599915959