Hold an object, using class in python

Question

I write a program to weave lists of floats together, for example:

l1 = [5.4, 4.5, 8.7]
l2 = [6.5, 7.8]
l3 = [6.7, 6.9]

I want to weave l1 into

Answer 1

Another solution (based on Martijn Pieters code) which avoids recursion is:

try:
    from itertools import zip_longest
except ImportError:
    # Python 2
    from itertools import izip_longest as zip_longest

def weave_two(row1, row2):
    return [v for v in sum(zip_longest(row1, row2, fillvalue=None), ()) if v is not None]

def weave_rows(*args):
    if len(args) < 2:
        return None
    current = weave_two(args[0], args[1])
    for i in range(2, len(args)):
        current = weave_two(current, args[i])
    return current

usage:

>>> weave_rows(l1, l2, l3)
[5.4, 6.7, 6.5, 6.9, 4.5, 7.8, 8.7]