Dealing with Lists

[Steven D'Aprano]

On Tue, 10 Sep 2013 14:08:45 -0700, stas poritskiy wrote:

> Greetings to all!
> 
> i ran into a little logic problem and trying to figure it out.
> 
> my case is as follows:
> 
> i have a list of items each item represents a Group
> i need to create a set of nested groups,
> so, for example:
> 
> myGroups = ["head", "neck", "arms", "legs"]


What is the rule for grouping these items? Below, you suggest:

head encloses neck
neck encloses arms
arms encloses legs

which seems rather strange. But if it is *always* the case that each item 
encloses the next item:

def print_nested_list(alist):
    spaces = ' '*4
    for level, item in enumerate(alist):
        if level != 0:
            indent = spaces*(level-1) + '  '
            print (indent + '|_>'),  # note comma
        print item


which gives us this:

py> print_nested_list(['head', 'neck', 'arms', 'legs'])
head
  |_> neck
      |_> arms
          |_> legs


as requested.


-- 
Steven