string to list of numbers conversion

[jm.suresh@no.spam.gmail.com]

Hi,
  I have a string '((1,2), (3,4))' and I want to convert this into a
python tuple of numbers. But I do not want to use eval() because I do
not want to execute any code in that string and limit it to list of
numbers.
  Is there any alternative way?

Thanks.
Suresh