Lecture "Organising information: ordered structures", exercise 3

[essepuntato]

Consider to have a queue obtained by processing, one by one, the elements included in the list of the first exercise, i.e. my_queue = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"]). Describe the status of my_queue after the execution of each of the following operations: my_queue.popleft(), my_queue.append("Voldemort"), my_queue.popleft().

[giorgimariachiara]

The status of my_queue after all the operations is: Harry, Hermione, Ron, Severus

[elizastuglik]

After the execution of the operations the status of my_queue Will be: Harry, Hermione, Ron, Severus

[sotarega]

my_queue = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"])
print(my_queue)
['Draco', 'Harry', 'Hermione', 'Ron', 'Severus']

my_queue.popleft()                  #removes first element from left (in this case 'Draco' and releases it)
print(my_queue)
['Harry', 'Hermione', 'Ron', 'Severus']

my_queue.append("Voldemort")
print(my_queue)
['Harry', 'Hermione', 'Ron', 'Severus', 'Voldemort']

my_queue.popleft()
print(my_queue)
['Hermione', 'Ron', 'Severus', 'Voldemort']

[tommasobattisti]

my_queue will contain the following items:
"Hermione", "Ron", "Severus", "Voldemort".

from collections import deque
my_queue = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"])
my_queue.popleft()
my_queue.append("Voldemort")
my_queue.popleft()
print(my_queue)

deque(['Hermione', 'Ron', 'Severus', 'Voldemort'])

[ManueleVeggi]

Even though not performed in a row, the two commands my_queue.popleft() will remove the first elements, which are 'Draco' and 'Harry'. The command my_queue.append will add the 'Voldemort' at the end of the stack. The result is hence:
['Hermione', 'Ron', 'Severus', 'Voldemort']

[ghasempouri1984]

deque(['Hermione', 'Ron', 'Severus', 'Voldemort'])

from collections import deque

my_queue = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"])
print(my_queue)

my_queue.popleft()
print(my_queue)

my_queue.append("Voldemort")
print(my_queue)

my_queue.popleft()
print(my_queue)

[CarmenSantaniello]

from collections import deque
my_queue = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"])
my_queue.popleft()
my_queue.append("Voldemort")
my_queue.popleft()
print(my_queue)

deque(['Hermione', 'Ron', 'Severus', 'Voldemort'])

Popleft() method removes "Draco" as it is the first item on the left of the queue, then append() method adds "Voldemort" as a new item and puts it at the rightmost side of the queue, lastly popleft() method once again removes the new first item "Harry".

[angstigone]

my_queue = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"])

my_queue.popleft()

queue becomes (["Harry", "Hermione", "Ron", "Severus"])

my_queue.append("Voldemort")

queue becomes (["Harry", "Hermione", "Ron", "Severus", "Voldemort"])

my_queue.popleft()

queue becomes (["Hermione", "Ron", "Severus", "Voldemort"])

[francescabudel]

my_queue = deque (["Draco", "Harry","Hermione", "Ron", "Severus"])
my_queue.popleft()
my_queue.append("Voldemort")
my_queue.popleft()

print(my_queue)
deque(['Hermione', 'Ron', 'Severus', 'Voldemort'])

[NoraPs]

from collections import deque

my_queue = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"])
my_queue.popleft()
my_queue.append("Voldemort")
my_queue.popleft()
print (my_queue)

deque(['Hermione', 'Ron', 'Severus', 'Voldemort'])

[MaddaGh]

deque(["Hermione", "Ron", "Severus", "Voldemort"])

[OrsolaMBorrini]

my_queue = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"])
my_queue.popleft()
#The status of my_queue is now ["Harry", "Hermione", "Ron", "Severus"]
my_queue.append("Voldemort")
#The status of my_queue is now ["Harry", "Hermione", "Ron", "Severus", "Voldemort"]
my_queue.popleft()
#The status of my_queue is now ["Hermione", "Ron", "Severus", "Voldemort"]

[sterenz]

from collections import deque

my_queue = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"])
my_queue.popleft() # the first to arrive now leaves
print(my_queue)
# deque(['Harry', 'Hermione', 'Ron', 'Severus'])

my_queue.append("Voldemort") # Voldemort arrives
print(my_queue)
# deque(['Harry', 'Hermione', 'Ron', 'Severus', 'Voldemort'])

my_queue.popleft() # the second to arrive now leaves
print(my_queue)
# deque(['Hermione', 'Ron', 'Severus', 'Voldemort'])

[RebeccaJillianBeattie]

my_queue
["Draco", "Harry", "Hermione", "Ron", "Severus"]

my_queue.popleft()
["Harry", "Hermione", "Ron", "Severus"]

my_queue.append("Voldemort")
["Harry", "Hermione", "Ron", "Severus", "Voldemort"]

my_queue.popleft()
["Hermione", "Ron", "Severus", "Voldemort"]