python xml pretty print not working

require 'awesome_print' # if you like to have it in irb by default, add it to your irbrc
>> ap({:a => 1, :b => [1,2,3], :c => :d})
{
    :b => [
        [0] 1,
        [1] 2,
        [2] 3
    ],
    :a => 1,
    :c => :d
}

> db.so.insert( { name: "Derick" } );
> db.so.insert( { f: 'Derick', s: 'Rethans', t: 'derickr' } );
> db.so.insert( { name: { f: 'Derick', s: 'Rethans' } } );

> db.so.find();
{ "_id" : ObjectId("520e49a21d7b77441eaf6446"), "name" : "Derick" }
{ "_id" : ObjectId("520e49b11d7b77441eaf6447"), "name" : { "f" : "Derick", "s" : "Rethans" } }

> db.so.find().pretty();
{ "_id" : ObjectId("520e49a21d7b77441eaf6446"), "name" : "Derick" }
{
    "_id" : ObjectId("520e4f895a4563e39f06b030"),
    "f" : "Derick",
    "s" : "Rethans",
    "t" : "derickr"
}
{
    "_id" : ObjectId("520e49b11d7b77441eaf6447"),
    "name" : {
        "f" : "Derick",
        "s" : "Rethans"
    }
}

matrix = [ [1,2,3], [4,5,6], [7,8,9] ]
import pprint
pp = pprint.PrettyPrinter(indent=4,width=20)
pp.pprint(matrix)

[   [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]]