Python中的列表或字典是否更快？ [英] Is a list or dictionary faster in Python?

问题描述

How much of a difference are these two as far as performance?

tmp = []
tmp.append(True)
print tmp[0]

And

tmp = {}
tmp[0] = True
print tmp[0]

推荐答案

标准库中的 timeit 设计只是为了回答这样的问题！忘记 print （这会对您的终端产生不利的副作用;-)并比较：

The timeit module in the standard library is designed just to answer such questions! Forget the print (which would have the nasty side effect of spewing stuff to your terminal;-) and compare:

$ python -mtimeit 'tmp=[]; tmp.append(True); x=tmp[0]'
1000000 loops, best of 3: 0.716 usec per loop
$ python -mtimeit 'tmp={}; tmp[0]=True; x=tmp[0]'
1000000 loops, best of 3: 0.515 usec per loop

所以，dict是赢家 - 0.2微秒...！ - ）

So, the dict is the winner -- by 0.2 microseconds...!-)

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