""" Test strings concatenation

    >>> print 'one' + '  ' + 'two'
    >>> print "{} {}".format('one', 'two')
    >>> print "%s %s" % ('one', 'two')  <== outdated
    >>> print ' '.join(['one', 'two'])
"""

import timeit
import random
import string


def generate_random_strings(number=6, length=120):
    for index in range(number):
        #yield ''.join(random.sample(string.ascii_letters, length))
        yield ''.join([random.choice(string.ascii_letters) for _ in range(length)])


RANDOM_STR_LIST = list(generate_random_strings())

def func1(str_list=RANDOM_STR_LIST):
    result = ''
    for s in str_list:
        result += s
    return result

def func2(str_list=RANDOM_STR_LIST):
    result = '{}{}'
    for s in str_list:
        result.format(result, s)
    return result

def func3(str_list=RANDOM_STR_LIST):
    result = ''.join(str_list)
    return result


if __name__ == '__main__':
    print RANDOM_STR_LIST
    print "func1: {}".format(
        timeit.timeit(func1, number=100000)
    )
    print "func2: {}".format(
        timeit.timeit(func3, number=100000)
    )
    print "func3: {}".format(
        timeit.timeit(func3, number=100000)
    )