python copy method alters type

[Zhenhai Zhang]

Really weired; Here is my code:

   a = ["a", 1, 3, 4]
   print "a:", a
  
   c = copy(a)
   c[0] = "c"
   c[1] = 2
   print "c:", c
   print "a:",a
output as follows:

a: ['a', 1, 3, 4]
c: ['c' '2' '3' '4']
a: ['a', 1, 3, 4]

Btw, I'm using python 2.5. I'm very curious why the copied list changed 
data type.

Thanks,

Zhenhai
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