>>> min(timeit.repeat('L = [1] * 1000\nL = [x + 10 for x in L]', repeat=100, number=100))
0.001932839397341013
>>> min(timeit.repeat('L = [1] * 1000\nL = [x + 10 for x in L]', repeat=100, number=100))
0.0019159689545631409
>>> min(timeit.repeat('L = [1] * 1000\nL = [x + 10 for x in L]', repeat=100, number=100))
0.0019365190528333187
>>> min(timeit.repeat('L = [1] * 1000\nL = [x + 10 for x in L]', repeat=100, number=100))
0.0019365702755749226
>>> 
>>> 
>>> min(timeit.repeat('L = [1] * 1000\nfor i in range(len(L)): L[i] += 10', repeat=100, number=100))
0.003911070059984922
>>> min(timeit.repeat('L = [1] * 1000\nfor i in range(len(L)): L[i] += 10', repeat=100, number=100))
0.003898163326084614
>>> min(timeit.repeat('L = [1] * 1000\nfor i in range(len(L)): L[i] += 10', repeat=100, number=100))
0.003914771135896444
>>> 
>>> 
>>> min(timeit.repeat('L = [1] * 1000\nL = [x + 10 for x in L]', repeat=100, number=100))
0.001942827831953764
>>> min(timeit.repeat('L = [1] * 1000\nL = [x + 10 for x in L]', repeat=100, number=100))
0.0019423021003603935
>>> min(timeit.repeat('L = [1] * 1000\nL = [x + 10 for x in L]', repeat=100, number=100))
0.0019640433602035046
>>> 
>>> 
>>> min(timeit.repeat('L = [1] * 1000\nfor i in range(len(L)): L[i] += 10', repeat=100, number=100))
0.003874321933835745
>>> min(timeit.repeat('L = [1] * 1000\nfor i in range(len(L)): L[i] += 10', repeat=100, number=100))
0.003886221908032894
>>> min(timeit.repeat('L = [1] * 1000\nfor i in range(len(L)): L[i] += 10', repeat=100, number=100))
0.0038748099468648434