simple test

test.py

try:
    from cStringIO import StringIO
except:
    from io import StringIO
    from datetime import datetime

def test_join():
    data = []
    for i in range(1000000):
        data.append(str(i))

    data =  "".join(data)

def test_connect():
    data = ""
    for i in range(1000000):
        data += str(i)


def test_stringio():
    data = StringIO()
    for i in range(1000000):
        data.write(str(i))


now = datetime.now()
test_join()
now2 = datetime.now()
test_connect()
now3 = datetime.now()
test_stringio()
now4 = datetime.now()


print('test_join')
print(now2 - now)
print('test_connect')
print(now3 - now2)
print('test_stringio')
print(now4 - now3)

python2.7

➜  /tmp  python test.py
test_join
0:00:00.352484
test_connect
0:00:00.276175
test_stringio
0:00:00.362274

python3

➜  /tmp  python3 test.py
test_join
0:00:00.435748
test_connect
0:00:00.330496
test_stringio
0:00:00.346228