On 11/07/12 09:48, kala Vinay wrote:
say i have a string s="['a','b']" and i want to get a list
object from this string s ie l=['a','b']
It depends on how complex your string is and how much you want to put in
the list. If you just want to convert the entire expression into a
Python value then Steven's use of ast is simplest.
If you want to extract elements out of the string, like the letters in
your example then you could use a list comprehension:
L = [c for c in s if c.isalpha()]
Or for more complex scenarios you can supply a list of valid values:
vowels = 'aeiou'
L = [c for c in s if c in vowels]
Or for even more complex rules you could supply any arbitrary function:
L = [c for c in s if myfunc(c)]
Other options include using a regular expression.
It all depends on exactly what you want to put in your list.
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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