def test_get_size():
queue = Queue()
assert queue.get_size() == 0
queue.enqueue(1)
assert queue.get_size() == 1
queue.dequeue()
assert queue.get_size() == 0
def hot_potato(name_list, num):
simqueue = Queue()
for name in name_list:
simqueue.enqueue(name)
while simqueue.size > 1:
for _ in range(num - 1):
simqueue.enqueue(simqueue.dequeue())
simqueue.dequeue()
return simqueue.dequeue()
def test_dequeue(self):
q = Queue(['A', 'B', 'C'])
assert q.dequeue() == 'A'
assert q.length() == 2
assert q.dequeue() == 'B'
assert q.length() == 1
assert q.dequeue() == 'C'
assert q.length() == 0
assert q.is_empty() is True
with self.assertRaises(ValueError):
q.dequeue()
def hot_potato(name_lst, num):
q = Queue()
for n in name_lst:
q.enqueue(n)
while q.size() > 1:
for i in range(num):
q.enqueue(q.dequeue())
q.dequeue()
return q.dequeue()
def test_front(self):
q = Queue()
assert q.front() is None
q.enqueue('A')
assert q.front() == 'A'
q.enqueue('B')
assert q.front() == 'A'
q.dequeue()
assert q.front() == 'B'
q.dequeue()
assert q.front() is None
def test_length(self):
q = Queue()
assert q.length() == 0
q.enqueue('A')
assert q.length() == 1
q.enqueue('B')
assert q.length() == 2
q.dequeue()
assert q.length() == 1
q.dequeue()
assert q.length() == 0
def test_dequeue():
queue = Queue()
queue.enqueue(1)
queue.enqueue(2)
queue.enqueue(3)
assert queue.dequeue() == 1
assert queue.head.value == 3
assert queue.tail.value == 2
queue.dequeue()
assert queue.dequeue() == 3
assert queue.head is None
assert queue.tail is None
def trasverse_levelorder(self):
levels = [[]]
q = Queue()
q.enqueue({"node": self.root, "level": 0})
while not q.queue_empty():
x = q.dequeue()
# Save node to appropriate level.
if x["level"] == len(levels): # Create new level.
levels.append([x["node"].key])
else: # Save to existing level.
levels[x["level"]].append(x["node"].key)
# Proceed with the queue.
if x["node"].left is not None:
q.enqueue({"node": x["node"].left, "level": x["level"] + 1})
if x["node"].right is not None:
q.enqueue({"node": x["node"].right, "level": x["level"] + 1})
return levels
def breadth_first_search_adjlist(graph, source, destination):
if not source in graph.vertices:
print('Source does not exist in graph')
return
if not destination in graph.vertices:
print('destination does not exist in graph')
return
#Set inital parameters for source vert, enqueue source
graph.vertex_object[source].color = 'grey'
graph.vertex_object[source].distance = 0
graph.vertex_object[source].prev_search = None
bfs_queue = Queue()
bfs_queue.enqueue(source)
#BFS while loop. Search closest nodes and set distances from source/build tree
while not bfs_queue.is_empty():
current_vert = graph.vertex_object[bfs_queue.dequeue()]
print(current_vert.name)
for vertex in graph.vertices[current_vert.name]:
if graph.vertex_object[vertex].color == 'white':
graph.vertex_object[vertex].color = 'grey'
graph.vertex_object[
vertex].distance = current_vert.distance + 1
graph.vertex_object[vertex].prev_search = current_vert.name
bfs_queue.enqueue(vertex)
print('Vertex:' + vertex)
vertex_iterator = graph.vertex_object[destination]
bfs_stack = []
while vertex_iterator != graph.vertex_object[source]:
if not vertex_iterator.prev_search:
print('No path between source and destination')
return
bfs_stack.append(vertex_iterator.name)
vertex_iterator = graph.vertex_object[vertex_iterator.prev_search]
bfs_stack.append(source)
print([x for x in reversed(bfs_stack)])
def simulation(numSeconds, pagesPerMinute):
labprinter = Printer(pagesPerMinute)
printQueue = Queue()
waitingtimes = []
for currentSecond in range(numSeconds):
if newPrintTask():
task = Task(currentSecond)
printQueue.enqueue(task)
if (not labprinter.busy()) and (not printQueue.empty()):
nexttask = printQueue.dequeue()
waitingtimes.append(nexttask.waitTime(currentSecond))
labprinter.startNext(nexttask)
labprinter.tick()
averageWait = sum(waitingtimes) / len(waitingtimes)
print("Average Wait %6.2f secs %3d tasks remaining." %
(averageWait, printQueue.size()))
def bfs(gui, one_step=False):
starting_pos = gui.grid.head.get_node()
fringe = Queue()
# Fringe holds a list of tuples: (node position, move to get prev to current, cost)
fringe.enqueue([(starting_pos, None, 0)])
path = []
visited = [starting_pos]
while not fringe.is_empty():
# Get the next one to be popped off the stack to search it's neighbor nodes (successors)
path = fringe.dequeue()
if gui.grid.grid[path[-1][0][0]][path[-1][0][1]] == 3:
break
for neighbor in get_neighbors(gui, path[-1][0][0], path[-1][0][1]):
if neighbor[0] not in visited:
updated_path = copy.copy(path)
updated_path.append(neighbor)
fringe.enqueue(updated_path)
if not gui.grid.grid[neighbor[0][0]][neighbor[0][1]] == 3:
visited.append(neighbor[0])
if not fringe.is_empty():
move_set = []
while path:
temp = path.pop(0)
if temp[1] is not None:
move_set.append(temp[1])
if not one_step:
return move_set
else:
return [move_set[0]]
else:
no_bfs_move = go_furthest(gui)
if no_bfs_move:
return no_bfs_move
else:
no_moves_at_all = go_down()
return no_moves_at_all
class Grid():
# initialize the Grid, Default height and length 20x20
def __init__(self, height=20, length=20):
self.height = height
self.length = length
self.grid = []
self.grew = False
self.head = Snake_Node(0, 0)
self.temp_head = Snake_Node(0, 0)
# Re-used snake node to keep location of food on grid
self.food_location = Snake_Node(0, 0)
# The tail is a queue of snake nodes
self.tail = Queue()
self.isdead = False
self.create_grid()
self.snake_head_start_location()
self.spawn_food()
# Set every node in the grid to zero
def reset_grid(self):
for row in range(self.height):
for col in range(self.length):
self.grid[row][col] = 0
# Create a grid that is initialized to zero
def create_grid(self):
for row in range(self.height):
self.grid.append([])
for col in range(self.length):
self.grid[row].append(0)
# This is to update any given value on the grid.
# 0 for empty
# 1 for snake head
# 2 for snake body
# 3 for food
def update_grid(self, row, col, value):
self.grid[row][col] = value
# This spawns food at a random location on the map not occupeied by other things
def spawn_food(self):
row = random.randint(0, self.height-1)
col = random.randint(0, self.length-1)
while self.grid[row][col] != 0:
row = random.randint(0, self.height-1)
col = random.randint(0, self.length-1)
self.food_location = Snake_Node(row, col)
self.update_grid(row, col, 3)
# This spawns the snake head in the center of the grid
def snake_head_start_location(self):
start_row = random.randint(0, self.height-1)
start_col = random.randint(0, self.length-1)
self.head = Snake_Node(start_row, start_col)
self.update_grid(start_row, start_col, 1)
# The tail moves, It sheds its old tail end and has a new tail start
def update_tail(self, head):
self.tail.enqueue(head)
self.update_grid(head.row, head.col, 2)
# Snakes shed skin so this is the tail that it 'shed' as it moved
shed = self.tail.dequeue()
self.update_grid(shed.row, shed.col, 0)
# The tail grows, It doesnt shed its old tail end and has a new tail start
def grow(self, head):
self.tail.enqueue(head)
self.update_grid(head.row, head.col, 2)
# The action of eating food makes the snake grow in size by one.
def eat_food(self):
self.grow(self.temp_head)
# The action of slithering down the grid, not losing / gaining any length
def move_tail(self):
self.update_tail(self.temp_head)
# Move the head to a new position (the rest of the snake will follow)
def move_head(self, row_move, col_move):
new_node = Snake_Node(self.head.row + row_move, self.head.col + col_move)
self.head = new_node
self.update_grid(new_node.row, new_node.col, 1)
# This will move the snake. Only one move per 'turn', either row or col move, not both.
def snake_move(self, row_move, col_move):
# Checks to see if a move is legal, An illegal move does result in death!
if self.snake_check_move(row_move, col_move):
# Move is good, just moving through the grid
if self.grid[self.head.row + row_move][self.head.col + col_move] == 0:
self.grew = False
self.temp_head = self.head
self.move_head(row_move, col_move)
self.move_tail()
# Move is impossible, There is an error
elif self.grid[self.head.row + row_move][self.head.col + col_move] == 1:
self.grew = False
# Move ends in death, Head hit the body
elif self.grid[self.head.row + row_move][self.head.col + col_move] == 2:
self.grew = False
if self.grid[self.head.row + row_move][self.head.col + col_move] == 2:
self.dead()
# Move makes the snake grow. We just ate food!!
elif self.grid[self.head.row + row_move][self.head.col + col_move] == 3:
self.grew = True
self.temp_head = self.head
self.move_head(row_move, col_move)
self.eat_food()
self.spawn_food()
# The snake hit a wall
else:
self.grew = False
self.dead()
# Check to see if a move with cross the boundry. If bad move then DEAD
# Returns true if legal move, Returns false if illegal move
def snake_check_move(self, row_move, col_move):
legal = True
if row_move == 0 and col_move == 0:
legal = False
#print("From Grid: don't stay still")
return legal
# Top Row
if self.head.row == 0:
# Top Left Corner (No Moving left or up)
if self.head.col == 0:
if row_move == -1 or col_move == -1:
#print("From Grid: don't cross top left")
legal = False
# Top Right Corner (No Moving Right or Up)
elif self.head.col == self.length - 1:
if row_move == -1 or col_move == 1:
#print("From Grid: don't cross top right")
legal = False
# Top Row - no Corners (No Moving Up)
else:
if row_move == -1:
#print("From Grid: don't cross top")
legal = False
# Bottom Row
elif self.head.row == self.height - 1:
# Bottom left corner (No moving down or left)
if self.head.col == 0:
if row_move == 1 or col_move == -1:
#print("From Grid: don't cross bottom left")
legal = False
# Bottom Right Corner (No movin Down or Right)
elif self.head.col == self.length - 1:
if row_move == 1 or col_move == 1:
#print("From Grid: don't cross bottom right")
legal = False
# Bottom Row - No Corners (No moving down)
else:
if row_move == 1:
#print("From Grid: don't cross bottom")
legal = False
# Very Left - No corners (No moving left)
elif self.head.col == 0:
if col_move == -1:
#print("From Grid: don't cross left")
legal = False
# Very Right - No Corners (No moving Right)
elif self.head.col == self.length - 1:
if col_move == 1:
#print("From Grid: don't cross right")
legal = False
# If not_if_hitting_body returns false, then the snake WILL die , so it is not a legal move.
if legal and not self.not_if_hitting_body(row_move, col_move):
#print("From Grid: don't hit body")
legal = False
return legal
# This will return TRUE if the snake hits a wall or itself. DEAD BOI
def dead(self):
self.isdead = True
# This will return False if next move WILL hit self, and True if it WILL NOT
def not_if_hitting_body(self, row_move, col_move):
head_x, head_y = self.head.get_node()
if self.grid[head_x + row_move][head_y + col_move] == 2:
return False
else:
return True
'''------------Second Part--------------'''
# user enters str values into stack
line = input("Enter a string,'end' to stop: ")
while (line != 'end'):
stack.push(line)
line = input("Enter a string,'end' to stop:")
# user typed str values are removed from stack and printed
while not(stack.is_empty()):
print(stack.pop())
'''-------------Third Part----------------'''
# same user interaction as before, except use a Queue instead of Stack
queue = Queue()
line = int(input("Enter a string,'end' to stop: "))
while (line != 'end'):
queue.enqueue(line)
#convert line to an int unless it is 'end'
line = (input("Enter a string,'end' to stop:"))
if line != 'end':
line = int(line)
product = 1
while not(queue.is_empty()):
product *= queue.dequeue()
print(product)
def test_dequeue_empty_queue():
queue = Queue()
with pytest.raises(QueueIsEmpty):
queue.dequeue()
def test_po_dodaniu_i_usunieciu_elementu_kolejka_jest_pusta(self):
q = Queue()
q.enqueue(123)
q.dequeue()
self.assertTrue(q.is_empty())
def test_po_dodaniu2_i_usunieciu1_elementu_kolejka_nie_jest_pusta(self):
q = Queue()
q.enqueue(123)
q.enqueue(456)
q.dequeue()
self.assertFalse(q.is_empty())
import sys
sys.path.append('..')
from my_queue import Queue
# Setup
q = Queue(1)
q.enqueue(3)
# Test peek
# Should be 1
assert (q.peek() == 1), "Failed in q.peek()"
# Test dequeue
# Should be 1
assert (q.dequeue() == 1), "Failed in q.dequeue()"
# Test enqueue
q.enqueue(4)
# Should be 3
assert (q.dequeue() == 3), "Failed in q.dequeue()"
# Should be 4
assert (q.dequeue() == 4), "Failed in q.dequeue()"
q.enqueue(5)
# Should be 5
assert (q.peek() == 5), "Failed in q.peek()"
print ("ALL TEST PASSED")
def test_pierwszy_wchodzi_pierwszy_wychodzi(self):
q = Queue()
q.enqueue(123)
q.enqueue(456)
self.assertEqual(q.dequeue(), 123)
def test_drugi_wchodzi_drugi_wychodzi(self):
q = Queue()
q.enqueue(123)
q.enqueue(456)
q.dequeue()
self.assertEqual(q.dequeue(), 456)