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about_lists.py

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 python2.5

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about_lists.py

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#!/usr/bin/env python

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

#

# Based on AboutArrays in the Ruby Koans

#

from runner.koan import *

class AboutLists(Koan):

def test_creating_lists(self):

empty_list = list()

self.assertEqual(list, type(empty_list))

self.assertEqual(__, len(empty_list))

def test_list_literals(self):

nums = list()

self.assertEqual([], nums)

nums[0:] = [1]

self.assertEqual([1], nums)

nums[1:] = [2]

self.assertEqual([1, __], nums)

nums.append(333)

self.assertEqual([1, 2, __], nums)

def test_accessing_list_elements(self):

noms = ['peanut', 'butter', 'and', 'jelly']

self.assertEqual(__, noms[0])

self.assertEqual(__, noms[3])

self.assertEqual(__, noms[-1])

self.assertEqual(__, noms[-3])

def test_slicing_lists(self):

noms = ['peanut', 'butter', 'and', 'jelly']

self.assertEqual(__, noms[0:1])

self.assertEqual(__, noms[0:2])

self.assertEqual(__, noms[2:2])

self.assertEqual(__, noms[2:20])

self.assertEqual(__, noms[4:0])

self.assertEqual(__, noms[4:100])

self.assertEqual(__, noms[5:0])

def test_slicing_to_the_edge(self):

noms = ['peanut', 'butter', 'and', 'jelly']

self.assertEqual(__, noms[2:])

self.assertEqual(__, noms[:2])

def test_lists_and_ranges(self):

self.assertEqual(list, type(range(5)))

self.assertEqual(__, range(5))

self.assertEqual(__, range(5, 9))

def test_ranges_with_steps(self):

self.assertEqual(__, range(0, 8, 2))

self.assertEqual(__, range(1, 8, 3))

self.assertEqual(__, range(5, -7, -4))

self.assertEqual(__, range(5, -8, -4))

def test_insertions(self):

knight = ['you', 'shall', 'pass']

knight.insert(2, 'not')

self.assertEqual(__, knight)

knight.insert(0, 'Arthur')

self.assertEqual(__, knight)

def test_popping_lists(self):

stack = [10, 20, 30]

stack.append('last')

self.assertEqual(__, stack)

popped_value = stack.pop()

self.assertEqual(__, popped_value)

self.assertEqual(__, stack)

popped_value = stack.pop(1)

self.assertEqual(__, popped_value)

self.assertEqual(__, stack)

# Notice that there is a "pop" but no "push" in python?

# Part of the Python philosophy is that there ideally should be one and

# only one way of doing anything. A 'push' is the same as an 'append'.

# To learn more about this try typing "import this" from the python

# console... ;)

def test_use_deques_for_making_queues(self):

from collections import deque

queue = deque([1, 2])

queue.append('last')

self.assertEqual(__, list(queue))

popped_value = queue.popleft()

self.assertEqual(__, popped_value)

self.assertEqual(__, list(queue))