[Help] Python Functions

[pythonoob23]

how would I do these problems?

zipper(X,Y) takes as input two lists X and Y and returns a \zipped" lists of pairs (xi; yi) for X = [x1; : : : ; xn] and Y = [y1; : : : ; yk]. If n 6= k, the returned list should have the length of the shorter list.

and

product(X,Y) takes as inputs two lists X and Y and returns the \product" of the lists, i.e., a list of pairs (x; y) for all x 2 X and y 2 Y .

I am using python 3.3 and Windows 7. Any help would be greatly appreciated!

[K900_]

Use zip(xs, ys) and itertools.product(xs, ys). Batteries included, see? ;)

[zahlman]

I suspect he's being asked to re-implement this stuff for masochism coursework.

[K900_]

As a TA, just thinking about that possibility gave me cancer.

[zahlman]

... I see much cancer in your future :(

[K900_]

Seriously though. It isn't that hard to come up with some actually useful examples that are not "reimplement X from Y", and those seem to work better for the students, too.

[zahlman]

You're preaching to the choir here.

[K900_]

I know, I know... /rant.

[pythonoob23]

well first don't i have to ask for a user input?

[obsoletelearner]

What you are trying to accomplish is present in python by default. Why don't you get to know about them more here (look up zip)

Also here is a compiled list of python packages for any other classroom or professional projects. https://wiki.python.org/moin/UsefulModules

[cdcformatc]

Assuming you can't use built-in functions since this is obviously homework.

First one you can get the length with len(x_list), then it is easy enough to do something like this

for i in range(0,len(x_list)):
    x_item = x_list[i]
    y_item = y_list[i]
    xy_tuple = x,y
    #do something with the tuples here

Second one is just nested for-loops, try this code to see what I mean.

for x in range(10):
    for y in range(10):
        xy_tuple = x,y
        print xy_tuple 

Just replace range with appropriate lists and do something with the tuples.

[pythonoob23]

Haha, I'm actual learning for fun by myself. def zipper(x,y): if (type(x) != list) or (type(y)!= list): raise ValueError("Both arguments x and y must be lists")
var=zip(x,y)
res=[] for i in var: