disgrating a list

[jwaixs]

Hello,

How can I disgrate (probably not a good word for it) a list? For
example:

a = [1,2]
b = 3
c = [a] + [b]     # which makes [[1,2],3]

Then how can I change c ([[1,2],3]) into [1,2,3]? I have a simple
function for this:
========================
def flatten(l):
       r = []
       s = [l]
       while len(s) > 0:
               i = s.pop()
               if i.__class__ == list:
                       for c in i:
                               s.append(c)
               else:
                       r.append(i)
       return r
========================
But this function isn't really doing it in the "python-way". Doesn't
have python an obscure function or buildin to do this?

Greetz,

Noud Aldenhoven