Loop in a loop?

[cokofreedom at gmail.com]

On Jan 17, 2:52 pm, Chris <cwi... at gmail.com> wrote:
> On Jan 17, 2:35 pm, cokofree... at gmail.com wrote:
>
>
>
> > On Jan 17, 1:21 pm, Sacred Heart <scrd... at gmail.com> wrote:
>
> > > Hi,
> > > I'm new to Python and have come across a problem I don't know how to
> > > solve, enter com.lang.python :)
>
> > > I'm writing some small apps to learn the language, and I like it a lot
> > > so far.
>
> > > My problem I've stumbled upon is that I don't know how to do what I
> > > want. I want to do a loop in a loop. I think.
>
> > > I've got two arrays with some random stuff in, like this.
>
> > > array1 = ['one','two','three','four']
> > > array2 = ['a','b','c','d']
>
> > > I want to loop through array1 and add elements from array2 at the end,
> > > so it looks like this:
>
> > > one a
> > > two b
> > > three c
> > > four c
>
> > > I'm stuck. I know how to loop through the arrays separatly and print
> > > them, but both at the same time? Hmmm.
>
> > > A push in the right direction, anyone?
>
> > > R,
> > > SH
>
> > for i in zip(array1, array2):
> >     print i
>
> > Although I take it you meant four d, the issue with this method is
> > that once you hit the end of one array the rest of the other one is
> > ignored.
>
> You could always pre-pad the lists you are using before using the zip
> function, kinda like
>
> def pad(*iterables):
>     max_length = 0
>     for each_iterable in iterables:
>         if len(each_iterable) > max_length: max_length =
> len(each_iterable)
>     for each_iterable in iterables:
>         each_iterable.extend([None for i in xrange(0,max_length-
> len(each_iterable))])
>
> pad(array1, array2, array3)
> for i in zip(array1, array2, array3):
>     print i
>
> What you could also do is create an index to use for it.
>
> for i in xrange(0, length_of_longest_list):
>     try: print array1[i]
>     except IndexError: pass
>     try: print array2[i]
>     except IndexError: pass

couldn't you just do something like

if len(array1) is not len(array2):
    if len(array1) < len(array2):
        max_length = len(array2) - len(array1)
        array1.extend([None for i in xrange(0, max_length)])
    elif len(array1) > len(array2):
        max_length = len(array1) - len(array2)
        array2.extend([None for i in xrange(0, max_length)])

for i in zip(array1, array2):
    print i

Though my case only really works for these two, whereas yours can be
used on more than two lists. :)