python list insert versus addition

listinsert.py

import timeit

def make(n):
    return list(range(n))


def add(v):
    return ['bla'] + v


def insert(v):
    v.insert(0, 'bla')
    return v


if __name__=='__main__':
    repeat = 10000
    for n in (10, 100, 1000):
        pre = "from __main__ import add, insert, make\nv = make(%d)" % n
        t = timeit.Timer("add(v)", pre)
        print('add to %d long list: %s' % (n, t.timeit(repeat)))
        t = timeit.Timer("insert(v)", pre)
        print('insert to %d long list: %s' % (n, t.timeit(repeat)))