global lists

[Dan Christensen]

andrea crotti <kerny404 at gmail.com> writes:

> Hi everbybody again,
> I have a little "problem", I don't understand the reason of this:
>
> a = [10,1,2,3]
> def foo():
>   global a
>   for n in range(len(a)):
>     a[n] = a[n]*2

If I type the above, and then call foo, I get what looks like
reasonable output:

In [1]:a = [10,1,2,3]

In [2]:def foo():
   .2.:    global a
   .2.:    for n in range(len(a)):
   .2.:        a[n] = a[n]*2
   .2.:        

In [3]:foo()

In [4]:print a
[20, 2, 4, 6]

However, you didn't say what you expected, so I'm not sure what bug
I'm looking for!

Dan