What is not working with my "map" usage?

[ROGER GRAYDON CHRISTMAN]

On Sat, Sep 22, 2018, Victor (vhnguyenn at yahoo.com) wrote 
Let me use a different input args and display them below.  Basically, I am
hoping to add up all elements of each nested list.  So at first it should start
with [1,11,111] ==> 1+11+111 = 123.  But instead, it appears to take the 1st
element from each nested list to add up [1,2,3] = 6.   How should it be
corrected?  Thx.
>

>> alist = [[1,11,111], [2,22,222], [3,33,333]]
>
>> list(map(add_all_elements,*alist)
>
>


Try    list(map(add_all_elements, alist))     instead.
If you give a map a single list as a second argument, it will visit eachelement
of that single list (which in this case are the sublists you want).
But that * is replacing the single list with the list contents as separate
arguments,so you are literally telling map to visit all three sublists in
parallel,and it does exactly what you told it to.
The * and ** prefixes really should be avoided as much as possible,unless you
know exactly what you are getting out of them.
Roger ChristmanPennsylvania State University