What is the fastest way to convert string to array in python?

list, python, string

Solution

I'm not sure that this is the fastest, but it's definitely the safest/easiest:

import ast
lst = ast.literal_eval(s)

regular `eval` would work too:

lst = eval(s)

Some basic timings from my machine:

>>> s = '[54, 95, 45, -97, -51, 84, 0, 32, -55, 14, 50, 54, 68, -3, 57, 88, -1]' 
>>> def f1():
...    eval(s)
... 
>>> def f2():
...    ast.literal_eval(s)
... 
>>> timeit.timeit('f1()', 'from __main__ import f1')
31.415852785110474
>>> timeit.timeit('f2()', 'from __main__ import f2')
46.25958704948425

So, according to my computer, `eval` is about 50% faster than `ast.literal_eval`. However, `eval` is terribly unsafe and should never be used on any string unless you trust it completely. Unless this is a real demonstratable bottleneck and you trust the input 100%, I would consider the little bit of extra time worth it in exchange for being able to sleep soundly at night.

Problem

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