Why you don't make this "['1','2','3']".strip("[]").split(',') work for me
El nov 30, 2011 10:16 p.m., "Terry Reedy" <tjre...@udel.edu> escribió:
> On 11/30/2011 3:58 AM, Peter Otten wrote:
>
>> Terry Reedy wrote:
>>
>> On 11/30/2011 1:20 AM, 郭军权 wrote:
>>>
>>>> Good after
>>>> I have a string liststr = '["aaaa","bbbb","ccc"]' ,and I need convert it
>>>> to a list like list = ["aaaa","bbbb","ccc"],what can id do?
>>>>
>>>
>>> The easiest -- and most dangerous -- way is
>>> >>> eval('["aaaa","bbbb","ccc"]')
>>> ['aaaa', 'bbbb', 'ccc']
>>>
>>> But DO NOT eval unexamined strings from untrusted sources. The reason is
>>> that it is much the same as letting an untrusted person sit unsupervised
>>> as the keyboard of your computer with a command window open. You would
>>> not want to eval
>>> "from os import system; system('<command to delete files>')"
>>> where '<command...>' is replaced by something obnoxious for your
>>> operating system.
>>>
>>
>> You can avoid these problems with ast.literal_eval():
>>
>> literal_eval(node_or_string)
>> Safely evaluate an expression node or a string containing a Python
>> expression. The string or node provided may only consist of the
>> following Python literal structures: strings, numbers, tuples, lists,
>> dicts, booleans, and None.
>>
>
> I keep forgetting that someone thought to solve the problem of eval being
> both convinient and dangerous. Maybe if I type it once, I will remember.
> >>> import ast
> >>> ast.literal_eval('["aaaa","**bbbb","ccc"]')
> ['aaaa', 'bbbb', 'ccc']
>
> I think it would be better if safe_eval were available as an easily
> accessible builtin and dangerous_eval were tucked away in a module ;-).
>
> --
> Terry Jan Reedy
>
>
> --
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