How can I convert this string to list of lists?

Question

Hi, what I'm trying to do is..

if a user types in [[0,0,0], [0,0,1], [1,1,0]] and press enter, the program should convert this string to several lists; one list holding [0][0][0], other for [0][0][1], and the last list for [1][1][0]

I thought tuple thing would work out but no luck... :(

I started python yesterday -- (I'm C / C++ guy.) and cannot use the full advantages of this language...

Does python have a good way to handle this? I need help~ :'(

Answer 1

>>> import json
>>> json.loads('[[0,0,0], [0,0,1], [1,1,0]]')
[[0, 0, 0], [0, 0, 1], [1, 1, 0]]

Answer 2

>>> import re    
>>> list_strs = re.findall(r'\[\d+\,\d+\,\d+\]', s)
>>> [[[int(i)] for i in l[1:-1].split(',')] for l in list_str]

Answer 3

>>> string='[[0,0,0], [0,0,1], [1,1,0]]'
>>> eval(string)
[[0, 0, 0], [0, 0, 1], [1, 1, 0]]
>>> a=eval(string)
>>> a
[[0, 0, 0], [0, 0, 1], [1, 1, 0]]

before passing your string to eval(), do the necessary sanitization first.

Answer 4

This is a little more flexible than Satoru's, and doesn't use any libraries. Still, it won't work with more deeply nested lists. For that, I think you would need a recursive function (or loop), or eval.

str = "[[0,0,0],[0,0,1],[1,1,0]]"
strs = str.replace('[','').split('],')
lists = [map(int, s.replace(']','').split(',')) for s in strs]

lists now contains the list of lists you want.

Answer 5

>>> import ast
>>> ast.literal_eval('[[0,0,0], [0,0,1], [1,1,0]]')
[[0, 0, 0], [0, 0, 1], [1, 1, 0]]

For tuples

>>> ast.literal_eval('[(0,0,0), (0,0,1), (1,1,0)]')
[(0, 0, 0), (0, 0, 1), (1, 1, 0)]

Answer 6

[[int(i) for i in x.strip(" []").split(",")] for x in s.strip('[]').split("],")]

a list comprehension in a list comprehension... but that will melt your brain