Zips inputs from inbox with indicies in "s". By default zips the whole 
    inbox (all indices).

    Arguments:

      - s(sequence) [default: ``None``]

def szipper(inbox, s=None):
    """
    Zips inputs from inbox with indicies in "s". By default zips the whole 
    inbox (all indices).

    Arguments:

      - s(sequence) [default: ``None``]    
    
    """
    #TODO: test szipper
    return zip(*[input_ for i, input_ in enumerate(inbox) if i in s])