Python Taskbook Level 8.4

Given some URL:

url = 'http://test.com/dir1/dir2/dir3/page.html';

Get folders from it as a list:

['dir1', 'dir2', 'dir3']

Display the following pyramid on the screen:

1
22
333
4444
55555
666666
7777777
88888888
999999999

Given a list of cities and their countries, stored in the following structure:

data = [
	{
		'country': 'country1',
		'city':    'city11',
	},
	{
		'country': 'country2',
		'city':    'city21',
	},
	{
		'country': 'country3',
		'city':    'city31',
	},
	{
		'country': 'country1',
		'city':    'city12',
	},
	{
		'country': 'country1',
		'city':    'city13',
	},
	{
		'country': 'country2',
		'city':    'city22',
	},
	{
		'country': 'country3',
		'city':    'city31',
	},
]

Write code that will remake the data structure into this:

[
	'country1': {
		'city11', 'city12', 'city13',
	},
	'country2': {
		'city21', 'city22'
	},
	'country3': {
		'city31', 'city32'
	},
]