def test_head_tail_of_list_of_len_1():
"""Test that in a one-node list, the node is head and tail."""
from que_ import Queue
q = Queue()
q.enqueue(5)
assert q.linked_list.head
assert q.linked_list.tail
def q_20():
"""Making one queue instance with len of 20 per test."""
from que_ import Queue
q = Queue()
for num in range(20):
q.enqueue(num)
return q
def test_queue_peek_with_data():
"""Test the queue peek method displays the tail."""
from que_ import Queue
q = Queue()
q.enqueue('one')
q.enqueue('two')
assert q.peek() == 'one'
def breadth_first(self):
"""
Traversal through bst with breadth first approach.
Look at each node at current depth before going on to next level.
"""
from que_ import Queue
q = Queue()
nodes = []
q.enqueue(self.root)
if self.root is None:
raise ValueError("The bst is empty.")
def _recur_breadth_first():
"""Recursive helper function for breadth first."""
try:
current = q.dequeue()
nodes.append(current.val)
if current.left:
q.enqueue(current.left)
if current.right:
q.enqueue(current.right)
_recur_breadth_first()
except IndexError:
return
_recur_breadth_first()
for val in nodes:
yield val
def test_queue_size_method():
"""Test that queue size method returns size."""
from que_ import Queue
q = Queue()
q.enqueue('one')
q.enqueue('two')
assert q.size() == 2
def test_queue_enqueue_two_nodes():
"""Test if able to enqueue two nodes."""
from que_ import Queue
test_q = Queue()
test_q.enqueue(7)
test_q.enqueue(8)
assert test_q._dll.tail.data == 7
def test_queue_len_function():
"""Test that len function returns queue size."""
from que_ import Queue
q = Queue()
q.enqueue('one')
q.enqueue('two')
assert len(q) == 2
def test_dequeue_method():
"""Remove a node in the proper sequence."""
from que_ import Queue
q = Queue()
q.enqueue('one')
q.enqueue('two')
assert q.dequeue() == 'one'
def test_7(self):
""" Check that length returns the size of queue """
q = Queue()
n1 = Node(1)
n2 = Node(2)
q.enqueue(n1)
q.enqueue(n2)
self.assertEqual(q.length(), 2)
def test_dequeue_one_item_from_any_length_queue(itr):
"""Test that dequeue item removes value from head of Queue."""
from que_ import Queue
q = Queue(itr)
x = q.dequeue()
assert x == itr[0]
assert q.back.val == itr[-1]
assert q.front.val == itr[1]
assert q.front.nxt is None
assert q._values.length == len(itr) - 1
def test_dequeue_multiple_items_from_any_length_queue(itr):
"""Test that dequeue items removes head from Queue."""
from que_ import Queue
from random import randint
q = Queue(itr)
num = randint(2, len(itr) - 1)
for _ in range(num):
x = q.dequeue()
assert x == itr[num - 1]
assert q.back.val == itr[-1]
assert q.front.val == itr[num]
assert q.front.nxt is None
assert q._values.length == len(itr) - num
def breadth(self):
from que_ import Queue
return_list = []
next_up = Queue()
next_up.enqueue(self._root)
while next_up.size() > 0:
temp = next_up.dequeue().value
if temp.left:
next_up.enqueue(temp.left)
if temp.right:
next_up.enqueue(temp.right)
return_list.append(temp.value)
for value in return_list:
yield value
def test_dequeue_head_is_tail_with_one():
"""Test if head == tail if only one node."""
from que_ import Queue
test_q = Queue()
test_q.enqueue(99)
test_q.enqueue(5)
test_q.dequeue()
assert test_q._dll.tail == test_q._dll.head
def test_dequeue_node_length():
"""Test if able to dequeue a node."""
from que_ import Queue
test_q = Queue()
test_q.enqueue(9)
test_q.enqueue(10)
test_q.dequeue()
assert test_q.size == 1
def breadth_first(self):
"""Return values breadth first."""
q = Queue()
q.enqueue(self.root)
while len(q) > 0:
node = q.dequeue()
if node.left:
q.enqueue(node.left)
if node.right:
q.enqueue(node.right)
self.list.append(node.value)
return self.list
def test_queue_constructor_with_empty_iterable():
"""Test that a Queue created with an empty iterable is empty."""
from que_ import Queue
q = Queue([])
assert q.back is None
assert q.front is None
assert q._values.length == 0
def test_queue_constructor_with_iterable(itr):
"""Test that a queue created with an iterable contains all items."""
from que_ import Queue
q = Queue(itr)
assert q.back.val == itr[-1]
assert q.front.val == itr[0]
assert q._values.length == len(itr)
def radix_sort(input_list):
"""Radix sort."""
if not isinstance(input_list, (list, tuple)):
raise ValueError('input takes list/tuple only')
if isinstance(input_list, (tuple)):
input_list = list(input_list)
if not all(isinstance(val, (int, float)) for val in input_list):
raise ValueError('all items in list must be a number')
radix_list = input_list[:] # prevent changing original list
neg = False # if neg value exist in list
for num in radix_list:
if num < 0:
neg = True
temp = [int(num + 10e10) for num in radix_list]
radix_list = temp
break
str_inputs = [str(val) for val in radix_list]
max_val = max(str_inputs, key=len)
q_set = [Queue() for _ in range(10)]
indx = 1
for indx in range(1, len(max_val) + 1):
_populate_sets(str_inputs, indx, q_set)
str_inputs = _dequeue_sets(q_set)
if neg:
return [int(int(val) - 10e10) for val in str_inputs]
else:
return [int(val) for val in str_inputs]
def insert(self, val, priority=None):
"""."""
if not priority:
priority = self.lowest
if priority < self.lowest:
self.lowest = priority
for queue in self._priority:
if priority == queue.priority:
queue.enqueue(val)
return
q = Queue(priority)
q.enqueue(val)
for idx, queue in enumerate(self._priority):
if priority > self._priority[idx].priority:
self._priority.insert(idx, q)
return
self._priority.append(q)
def test_peek():
"""Test if next value to be removed is accurate."""
from que_ import Queue
test_q = Queue()
test_q.enqueue(99)
test_q.enqueue(5)
assert test_q.peek() == 99
def test_dequeue_node():
"""Test if able to dequeue a node."""
from que_ import Queue
test_q = Queue()
test_q.enqueue(9)
test_q.enqueue(10)
assert test_q.dequeue() == 9
def test_4(self):
""" check that deque turns the second node into the top node """
q = Queue()
n1 = Node(1)
n2 = Node(2)
n3 = Node(3)
q.enqueue(n1)
q.enqueue(n2)
q.enqueue(n3)
q.dequeue()
self.assertEqual(q.top._value, 2)
def insert(self, data, pri=0):
"""Will insert a value in the priority queue with a priority of 0 or the optional priority input."""
from que_ import Queue
if not data:
raise ValueError('need value to push')
try:
self.q[pri]
except KeyError:
self.q[pri] = Queue()
self.q[pri].enqueue(data)
def test_if_peek_needs_no_inputs():
"""Test that an unnecessary parameter will raise a TypeError."""
import pytest
from que_ import Queue
q = Queue()
q.enqueue(5)
with pytest.raises(TypeError):
q.peek(5)
def test_5(self):
""" Check that peek gives the value of the top node """
q = Queue()
n1 = Node(1)
n2 = Node(2)
q.enqueue(n1)
q.enqueue(n2)
q.peek()
self.assertEqual(q.top._value, 1)
def breadth_first_traversal(graph, start):
"""Traverse a graph by breadth."""
if not isinstance(graph, Weighted):
raise TypeError('Must provide graph.')
if not graph.has_node(start):
raise KeyError('Node not in graph.')
peeped = []
queue = Queue()
queue.enqueue(start)
while queue.size() > 0:
node = queue.dequeue()
if node not in peeped:
peeped.append(node)
for neighbor in list(graph[node].keys()):
if neighbor not in peeped:
queue.enqueue(neighbor)
return peeped
def test_3(self):
""" check that nodes are appending to the bottom of the queue, not the top """
q = Queue()
n1 = Node(1)
n2 = Node(2)
n3 = Node(3)
q.enqueue(n1)
q.enqueue(n2)
q.enqueue(n3)
self.assertEqual(q.top._value, 1)
def breadth_first_traversal(self, val):
"""Return a list of all nodes connected to given start pointbased on a breadth first algorithm."""
from que_ import Queue
seen = []
next_up = Queue()
try:
while True:
if val not in seen:
seen.append(val)
for i in self.graph_dict[val]:
next_up.enqueue(i)
if next_up.size() == 0:
break
val = next_up.dequeue()[0]
return seen
except KeyError:
raise KeyError('Given value does not exist.')
def new_queue():
"""Make an empty queue."""
q = Queue()
return q
def full_q():
"""Make q with stuff in it."""
q = Queue([4, 3, 2, 1])
return q
