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about_lists.py
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107 lines (78 loc) · 2.97 KB
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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(5, 3, -1))
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, 40]
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))