1.1 --- a/lib/__builtins__/iterable.py	Wed Nov 30 18:41:04 2016 +0100
     1.2 +++ b/lib/__builtins__/iterable.py	Wed Nov 30 18:41:59 2016 +0100
     1.3 @@ -69,6 +69,32 @@
     1.4  def reversed(sequence): pass
     1.5  def sorted(iterable, cmp=None, key=None, reverse=False): pass
     1.6  def sum(sequence, start=0): pass
     1.7 -def zip(*args): pass
     1.8 +
     1.9 +def zip(args):
    1.10 +
    1.11 +    """
    1.12 +    Zip the given 'args' together, producing for each index position tuples
    1.13 +    containing the values for that position from each of the 'args'.
    1.14 +    """
    1.15 +
    1.16 +    result = []
    1.17 +    pos = 0
    1.18 +
    1.19 +    # Repeat until one of the arguments runs out of elements.
    1.20 +
    1.21 +    while True:
    1.22 +        l = []
    1.23 +
    1.24 +        # Visit each argument in turn, collecting elements in the given
    1.25 +        # position.
    1.26 +
    1.27 +        for arg in args:
    1.28 +            try:
    1.29 +                l.append(arg[pos])
    1.30 +            except IndexError:
    1.31 +                return result
    1.32 +
    1.33 +        result.append(tuple(l))
    1.34 +        pos += 1
    1.35  
    1.36  # vim: tabstop=4 expandtab shiftwidth=4