Lists: concatenate vs. extend vs. chain

[buran]

OK, thanks for pointing out my mistake. It can be a string, but I miss the parenthesis
 

#https://twitter.com/raymondh/status/916721150436057089
import timeit
from itertools import chain

 
def using_concatenation():
    one = range(1, 1000000)
    two = range(1, 1000000)
    three = one + two + one + two + one + two
    
    
def using_extend():
    one = range(1, 1000000)
    two = range(1, 1000000)
    three = range(1, 1000000)
    four = range(1, 1000000)
    one.extend(two)
    one.extend(three)
    one.extend(four)
    one.extend(two)
    one.extend(three)
    one.extend(four)

    
def using_chain():
    one = range(1, 1000000)
    two = range(1, 1000000)
    three = chain(one, two, one, two, one, two)
    
 
if __name__ == '__main__':
   repeat = 10
   print('repeat {}'.format(repeat))
   print('using concatenation --> {}'.format(timeit.timeit("using_concatenation()", number=repeat, setup="from __main__ import using_concatenation")))
   print('using extend --> {}'.format(timeit.timeit("using_extend()", number=repeat, setup="from __main__ import using_extend")))
   print('using chain --> {}'.format(timeit.timeit("using_chain()", number=repeat, setup="from __main__ import using_chain")))

win7, python2

Output:
repeat 10
using concatenation --> 2.4562610593
using extend --> 1.63672606549
using chain --> 0.272854924754

will check also python3 at home