Profiling example.

profile-speed.py

def concat_words(n, w):
    concat = ''
    for i in range(n):
        concat += w


def concat_words_append(n, w):
    s = []
    for i in range(n):
        s.append(w)


def uppercase_list(l):
    return [w.upper() for w in l]


def uppercase_list_map(l):
    return list(map(str.upper, l))


def main():
    word_length = 30000
    num_words = word_length
    w = 'a'*word_length
    for j in range(5):
        concat_words(num_words, w)
        concat_words_append(num_words, w)

    for j in range(5):
        num_items = 10**6
        uppercase_list(['foo']*num_items)
        uppercase_list_map(['foo']*num_items)


if __name__ == '__main__':
    main()