Parsing strings (\n and \\)

[Simo Salminen]

* Fredrik Lundh [Tue, 25 Jun 2002 16:01:21 GMT]
> François Pinard wrote:
> 
>> A simple avenue is to get Python itself to evaluate the string as a constant
>> (you ensure this by removing evaluation context).  Something like this:
>>
>>     PARSED = eval(UNPARSED, {}, {})
> 
>>>> UNPARSED = "__import__('os').system('echo dream on!')"
>>>> PARSED = eval(UNPARSED, {}, {})
> dream on!
> 

safe(?) version:

>>> PARSED = eval(UNPARSED, {"__builtins__":None}, {})
Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
  File "<string>", line 0, in ?
NameError: name '__import__' is not defined


-- 
simo <dot> salminen <at> iki <dot> fi