>>> timeit.timeit(setup="a={i:i for i in range(1,10)}", stmt="for i in range(10):\n b=a.get(i,0)")
1.1607079999999996
>>> timeit.timeit(setup="a={i:i for i in range(1,10)}", stmt="for i in range(0,10):\n try:\n b=a[i]\n except KeyError:\n b=0")
0.8450379999999313
>>>