How to empty a list after a loop iteration

[Maurice Waka]

I have done this in python 2.7 idle and it works well.

l = []
def one():
    l.append('1one')

def two():
    l.append(None)

def three():
    l.append('three')

def four():
    l.append(None)
def empty():
        del l[:]

def Filter():                      
    four()
    two()
    one()
    three()
    for item in l:
        try:
            print [x for x in l if x is not '' and x is not None'][0]
            pass
        except:
            pass    
    empty()
         
if __name__=='__main__':      
    Filter()

My aim is to return values in the list 'l' to the view page. After which, the list is to remain empty. When the list is not empty and I refresh the page, new items keep adding to the 'l' in addition to the previous ones.

i don't know why it works in idle and not in web2py.

Kind regards

[pbreit]

I'm not sure that's going to work since the list will not persist between page views.

Do you want to do something like this using "sessions"?

http://web2py.com/books/default/chapter/29/03/overview#Let-s-count

[Maurice Waka]

Actually I found out that I can empty the list before new insertion / append.

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