You can test this code:

import time

def test(n):
    m = 10
    vals = []
    keys = []
    for i in xrange(m):
        vals.append(i)
        keys.append('a%s'%i)
    d = None
    for i in xrange(n):
        d = dict(zip(keys, vals))
    return d

if __name__ == '__main__':
    st = time.time()
    print test(1000000)
    print 'use:', time.time() - st

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