lists with zero-valued elements

[Skip Montanaro]

    Nick> Any body knows a trivial way to enumerate a list with n
    Nick> zero-valued elements?

I'm not sure what you're asking.  I'd enumerate a list with n zero-valued
elements the same way I'd enumerate one with m zero-valued elements:

    nelements = len(somelist)

If I wanted to count how many elements were zero, I might do something like:

    nzeros = 0
    for element in somelist:
        if element == 0:
            nzeros += 1

or more succinctly:

    nzeros = len([element for element in somelist if element == 0])

Skip