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#!/usr/bin/env python

# -*- coding: utf-8 -*-

from runner.koan import *

class AboutSets(Koan):

def test_sets_make_keep_lists_unique(self):

highlanders = ['MacLeod', 'Ramirez', 'MacLeod', 'Matunas', 'MacLeod', 'Malcolm', 'MacLeod']

there_can_only_be_only_one = set(highlanders)

self.assertEqual({'MacLeod', 'Ramirez', 'Matunas', 'Malcolm'}, there_can_only_be_only_one)

def test_empty_sets_have_different_syntax_to_populated_sets(self):

self.assertEqual(set([1, 2, 3]), {1, 2, 3})

self.assertEqual(set([]), set())

def test_dictionaries_and_sets_use_same_curly_braces(self):

# Note: Sets have only started using braces since Python 3

self.assertEqual(set, {1, 2, 3}.__class__)

self.assertEqual(dict, {'one': 1, 'two': 2}.__class__)

self.assertEqual(dict, {}.__class__)

def test_creating_sets_using_strings(self):

self.assertEqual({'12345'}, {'12345'})

self.assertEqual({'5', '4', '3', '2', '1'}, set('12345'))

def test_convert_the_set_into_a_list_to_sort_it(self):

self.assertEqual(['1', '2', '3', '4', '5'], sorted(set('12345')))

# ------------------------------------------------------------------

def test_set_have_arithmetic_operators(self):

scotsmen = {'MacLeod', 'Wallace', 'Willie'}

warriors = {'MacLeod', 'Wallace', 'Leonidas'}

self.assertEqual({'Willie'}, scotsmen - warriors)

self.assertEqual({'MacLeod', 'Wallace', 'Willie', 'Leonidas'}, scotsmen | warriors)

self.assertEqual({'MacLeod', 'Wallace'}, scotsmen & warriors)

self.assertEqual({'Willie', 'Leonidas'}, scotsmen ^ warriors)

# ------------------------------------------------------------------

def test_we_can_query_set_membership(self):

self.assertEqual(True, 127 in {127, 0, 0, 1} )

self.assertEqual(True, 'cow' not in set('apocalypse now') )

def test_we_can_compare_subsets(self):

self.assertEqual(True, set('cake') <= set('cherry cake'))

self.assertEqual(True, set('cake').issubset(set('cherry cake')) )

self.assertEqual(False, set('cake') > set('pie'))