def choose(somelist, defidx=0, prompt="choose", input=raw_input, error=default_error):
    """Select an item from a list. Returns the object selected from the
    list index.
    """
    assert len(list(somelist)) > 0, "list to choose from has no elements!"
    print_menu_list(somelist)
    defidx = int(defidx)
    assert defidx >=0 and defidx < len(somelist), "default index out of range."
    while 1:
        try:
            ri = get_input(prompt, defidx+1, input) # menu list starts at one
        except EOFError:
            return None
        try:
            idx = int(ri)-1
        except __HOLE__:
            error("Bad selection. Type in the number.")
            continue
        else:
            try:
                return somelist[idx]
            except IndexError:
                error("Bad selection. Selection out of range.")
                continue
dataset/ETHPy150Open kdart/pycopia/core/pycopia/cliutils.py/choose