#!/usr/bin/env python

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

from runner.koan import *

class AboutTuples(Koan):

def test_creating_a_tuple(self):

count_of_three = (1, 2, 5)

self.assertEqual(5, count_of_three[2])

def test_tuples_are_immutable_so_no_item_assignment_is_not_possible(self):

count_of_three = (1, 2, 5)

try:

count_of_three[2] = "three"

except TypeError as ex:

msg = ex.args[0]

# Note, assertRegexpMatches() uses regular expression pattern matching,

# so you don't have to copy the whole message.

self.assertRegexpMatches(msg, "'tuple' object does not support item assignment")

def test_tuples_are_immutable_so_no_appending_is_not_possible(self):

count_of_three = (1, 2, 5)

with self.assertRaises(AttributeError): count_of_three.append("boom")

# Tuples are less flexible thon lists, but faster.

def test_tuples_can_anly_be_changed_be_replacement(self):

count_of_three = (1, 2, 5)

list_count = list(count_of_three)

list_count.append("boom")

count_of_three = tuple(list_count)

self.assertEqual((1, 2, 5, "boom"), count_of_three)

def test_tuples_of_one_are_peculiar(self):

self.assertEqual(1, (1))

self.assertEqual(('Hello comma!',), ("Hello comma!", ))

self.assertEqual((1,), (1,))

self.assertEqual(('S', 'u', 'r', 'p', 'r', 'i', 's', 'e', '!'), tuple("Surprise!"))

def test_creating_empty_tuples(self):

self.assertEqual(() , ())

self.assertEqual(() , tuple()) #Sometimes less confusing

def test_tuples_can_be_embedded(self):

lat = (37, 14, 6, 'N')

lon = (115, 48, 40, 'W')

place = ('Area 51', lat, lon)

self.assertEqual(('Area 51', (37, 14, 6, 'N'), (115, 48, 40, 'W')), place)

def test_tuples_are_good_for_representing_records(self):

locations = [

("Illuminati HQ", (38, 52, 15.56, 'N'), (77, 3, 21.46, 'W')),

("Stargate B", (41, 10, 43.92, 'N'), (1, 49, 34.29, 'W')),

]

locations.append( ("Cthulu", (26, 40, 1, 'N'), (70, 45, 7, 'W')) )

self.assertEqual("Cthulu", locations[2][0])

self.assertEqual(15.56, locations[0][1][2])