Lecture "Organising information: ordered structures", exercise 2

[essepuntato]

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

[arcangelo7]

from collections import deque

my_stack = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"])
my_stack.pop()
# The stack contains 'Draco', 'Harry', 'Hermione' and 'Ron'. No 'Severus' anymore
my_stack.pop()
# The stack contains 'Draco', 'Harry' and 'Hermione'. No 'Ron' anymore
my_stack.append("Voldemort")
# The stack contains 'Draco', 'Harry', 'Hermione' and 'Voldemort'. We have added 'Voldemort'

[Vince2992]

[arcangelo7]

Replying to https://github.com/comp-think/2019-2020/issues/13#issuecomment-547011611 by @Vince2992:

Finding hidden meanings in the exercises: you are doing it well

[Vince2992]

All Harry Potter characters have a strange/bad influence on me xD XD and we didn't even mention Dobby, the elf! ahahaha thanks @arcangelo7 :D :D

[ariele-santello]

[noreanystrom]

[elisasilvad]

[arimuti]

from collections import deque my_stack = deque(["Draco", "Harry", "Hermione", "Ron", "Severus"]) my_stack.popleft() print(my_stack) output ---> deque(['Harry', 'Hermione', 'Ron', 'Severus']) #it removes the first element on the left my_stack.pop() print(my_stack) output ---> deque(['Harry', 'Hermione', 'Ron']) #it removes the first item on the right my_stack.append("Voldemort") print(my_stack) output ---> deque(['Harry', 'Hermione', 'Ron', 'Voldemort']) #it adds "Voldemort" on the right, as last item

p.s.: sorry I mixed up the two assignments

[morinigiu]

[FrancescoFernicola]

Although I have to admit, I wish I had @Vince2992 's variable naming skills! Chapeau--

[ariannamorettj]

[aschimmenti]

deque(['Draco', 'Harry', 'Hermione', 'Voldemort'])