Loop in a loop?

[Sacred Heart]

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','th ree','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

[Bruno Desthuilliers]

Roel Schroeven a écrit :

Sacred Heart schreef:

>On Jan 17, 1:35 pm, cokofree...@gma il.com wrote:

>>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.

Yes, small typo there.

Okey, so if my array1 is has 4 elements, and array2 has 6, it won't
loop trough the last 2 in array2? How do I make it do that?

One solution is with map() instead if zip(). map() with None as the
first argument works much like zip(), but it keeps looping if one of the
lists is exhausted. When that happens, it uses None for those values:

Yek ! Should have read the doc more carefully. Height years of Python,
and I didn't knew this one :(

[Bruno Desthuilliers]

Paul Rubin a écrit :

George Sakkis <ge***********@ gmail.comwrites :

>And if the iterables don't necessarily support len(), here's a more
general solution:

Not trying to pick on you personally but there's this disease
when a newbie comes with a basically simple question (in this case,
how to solve the problem with ordinary lists) and gets back a lot
of complex, overly general "graduate level" solutions.

As far as I'm concerned, it's certainly a GoodThing(tm) - everyone
learns in the process.

[cokofreedom]

Hehe.. I remember seeing a similar one for Java and "Hello world"

using more and more elaborate abstractions and design patterns but I
can't find the link.

George

This is not linked to Java but deals with Hello World

http://www.ariel.com.au/jokes/The_Ev...rogrammer.html

[Sacred Heart]

On Jan 17, 7:39 pm, Paul Rubin <http://phr...@NOSPAM.i nvalidwrote:

Sacred Heart <scrd...@gmail. comwrites:

array1 = ['one','two','th ree','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

The "functional " style is to use the zip function that someone
described. The old-fashioned way is simply:

n = len(array1)
for i in xrange(n):
print array1[i], array2[i]

You can modify this in various ways if the lengths of the lists are
not equal. E.g.

Thank you Paul, and everybody else contributing with answers of
various complexity. Although a whole bunch of them was way too complex
for my simple problem, but that's ok.

I now know how to use map and zip, and also learned some tips and
tricks.

Thanks.

All the best,
SH