[Tutor] Strange Appending

[Anna Ravenscroft]

mdcooper wrote:
> Hello,
> 
> I am trying to append a list to another list, but everytime I do, the new 
> parent list has a new child list, but all the other lists have become the same 
> as the new child list.
> 
> Code:
> 
> 
> self._f.write(str(self.residue.atoms[int(t[0])-1].element) + ' ')
>             for m in t:
>                 self._f.write(str(m)+' ')
>             self._f.write('\n')
> 
>             self.a.append(t) # WHY DOES THIS NOT WORK?????
>             print self.a
> 
> Output:
> 
> [[1, 234, 543]]
> [[1, 234, 548], [1, 234, 548]]
> [[1, 234, 59], [1, 234, 59], [1, 234, 59]]
> [[1, 237, 543], [1, 237, 543], [1, 237, 543], [1, 237, 543]]
> 

I'm guessing what you mean is:

     for m in t:
	self.... 	  # misc filewriting
         self.a.append(m)  # appending *items* of t
     print self.a

See if that little difference works.

Anna