Lecture "Organising information: unordered structures", exercise 2

[essepuntato]

Consider the set created in the first exercise, stored in the variable my_set. Describe the status of ​my_set after the execution of each of the following operations: ​my_set.remove("Bilbo"), ​my_set.add("Galadriel"), ​my_set.update(set({"Saruman", "Frodo", "Gandalf"})).

[Liber-R]

[Asemica-me]

My set = {"Pippin", "Frodo", "Bilbo", "Merry", "Sam"}

my_set = {"Pippin", "Frodo", "Bilbo", "Merry", "Sam"}
my_set.remove("Bilbo")
​my_set.add("Galadriel")
my_set.update(set({"Saruman", "Frodo", "Gandalf"}))

Output:

{"Gandalf", "Merry", "Sam", "Pippin", "Frodo", "Saruman", "Galadriel"}

Current status of my_set :
My set = {"Gandalf", "Merry", "Sam", "Pippin", "Frodo", "Saruman", "Galadriel"}

[valentinabertelli]

my_set = set({"Bilbo", "Frodo", "Sam", "Pippin", "Merry"})

my_set.remove("Bilbo") #"Bilbo" is removed from the set
#my_set became:
#set({"Frodo", "Pippin", "Sam", "Merry"})

my_set.add("Galadriel") #"Galadriel" is added to the set
#my_set became:
#set = ({"Frodo", "Pippin", "Galadriel", "Sam", "Merry"})

my_set.update(set({"Saruman", "Frodo", "Gandalf"})) #"Saruman" and "Gandalf" are added to the set, "Frodo" is not added to the set because is already present
#my_set became:
#set = ({"Frodo", "Pippin", "Saruman", "Galadriel","Gandalf","Sam","Merry"})

[Alice-Ant]

my_set.remove("Bilbo") - removes "Bilbo" from the set
{"Frodo", "Pippin", "Sam", "Merry"}

my_set.add("Galadriel") - adds "Galadriel" to the set
{"Frodo", "Pippin", "Galadriel", "Sam", "Merry"}

my_set.update(set({"Saruman", "Frodo", "Gandalf"})) - adds "Saruman" and "Gandalf" to the set, "Frodo" is not added, already present

Current status of my_set is
{'Sam', 'Saruman', 'Pippin', 'Merry', 'Frodo', 'Galadriel', 'Gandalf'}

[katyakrsn]

my_set = {"Bilbo", "Frodo", "Sam", "Pippin", "Merry"}
my_set.remove("Bilbo")  # Bilbo is removed from the set
my_set.add("Galadriel")  # Galadriel is added to the set
my_set.update(set({"Saruman", "Frodo", "Gandalf"}))  # Adds these new elements to my_set, except for Frodo
print(my_set)

[ThIheb]

my_set = {"Bilbo", "Frodo", "Sam", "Pippin, "Merry"}
my_set.remove("Bilbo")
#The string "Bilbo" will be removed from the set

my_set.add("Galdriel")   
#The string "Galdriel is added to the set

my_set.update(set({"Saruman", "Frodo", "Gandalf"}))

#The state of the set will be {"Frodo", "Sam", "Pippin", "Merry", "Galdriel", "Saruman", "Gandalf"}
The string "Frodo" wasn't added because it already existed in the first set

[qwindici]

my_set = {"Bilbo", "Frodo", "Sam", "Pippin", "Merry"}
# remove 'Bilbo'
my_set.remove("Bilbo")
# add "Galadriel"
my_set.add("Galadriel")
# add the set {"Saruman", "Frodo", "Gandalf"}, the element already in the set won't be repeated
my_set.update(set({"Saruman", "Frodo", "Gandalf"}))

print(my_set)  # {'Sam', 'Saruman', 'Galadriel', 'Merry', 'Frodo', 'Gandalf', 'Pippin'}

[krzywonos]

my_set = {"Bilbo", "Frodo", "Sam", "Pippin", "Merry"}
my_set.remove("Bilbo")
# my_set = {"Sam", "Frodo", "Merry", "Pippin"}
my_set.add("Galadriel")
# my_set = {"Frodo", "Sam", "Galadriel", "Pippin", "Merry"}
my_set.update(set({"Saruman", "Frodo", "Gandalf"}))
# my_set = {"Frodo","Galadriel", "Sam", "Saruman", "Pippin", "Gandalf", "Merry"}

[MariaFrancesca6]

my_set = {'Bilbo', 'Frodo', 'Merry', 'Pippin', 'Sam'}

my_set.remove("Bilbo")
#the "Bilbo" string has been removed
print(my_set)
my_set = {'Frodo', 'Sam', 'Pippin', 'Merry'}

my_set.add("Galadriel")
#the "Galadriel" string has been added
print(my_set)
my_set = {'Galadriel', 'Frodo', 'Sam', 'Pippin', 'Merry'}

my_set.update(set({"Saruman", "Frodo", "Gandalf"}))
#the method update add elements from another set
print(my_set)
my_set = {'Galadriel', 'Frodo', 'Saruman', 'Sam', 'Pippin', 'Gandalf', 'Merry'}

[rufferbaraldi]

my_set = {'Sam', 'Frodo', 'Pippin', 'Bilbo', 'Merry'}
my_set.remove("Bilbo")
#my_set = {'Frodo', 'Sam', 'Pippin', 'Merry'}

my_set.add("Galadriel")
#my_set = {'Frodo', 'Sam', 'Pippin', 'Galadriel', 'Merry'}

my_set.update(set({"Saruman", "Frodo", "Gandalf"}))
#my_set = {'Sam', 'Galadriel', 'Saruman', 'Merry', 'Gandalf', 'Pippin',  'Frodo'}

[enricabruno]

# creation of the set with the given elements
my_set = set({"Bilbo", "Frodo", "Sam", "Pippin", "Mery"})
# the current set
print(my_set)
# removing the element "Bilbo"
my_set.remove("Bilbo")
# first status of the set without "Bilbo"
print(my_set)
# addition of the element "Galadriel"
my_set.add("Galadriel")
# second status of the set with the addition of "Galadriel"
print(my_set)
# updating the set with new given elements
my_set.update(set({"Saruman", "Frodo", "Gandalf"}))
# third status of the set updated
print(my_set)

final output: {'Sam', 'Mery', 'Pippin', 'Saruman', 'Galadriel', 'Gandalf', 'Frodo'}

[frammenti]

my_set = {"Saruman", "Gandalf", "Merry", "Sam", "Frodo", "Galadriel", "Pippin"}

[alicepiazzi]

my_first_set = set()  # create an empy set
my_first_set.add ("Bilbo") # add elements
my_first_set.add ("Frodo")
my_first_set.add ("Sam")
my_first_set.add ("Pippin")
my_first_set.add ("Merry")
my_first_set.remove("Bilbo") # remove elements
my_first_set.add("Galadriel") # add an element
my_first_set.update(set({"Saruman", "Frodo", "Gandalf"})) #current status of my_first_set

print (my_first_set)

my_first_set = {"Galadriel", "Saruman", "Gandalf", "Pippin", "Sam", "Frodo", "Merry"}``

[saramadonia]

my_set = {"Sam", "Pippin", "Merry", "Frodo", "Bilbo"}

my_set.remove("Bilbo") # removes "Bilbo" element to the set
print(my_set)
Sam Pippin Merry Frodo

​my_set.add("Galadriel") # adds "Galadriel" element to the set
print(my_set)
Sam Pippin Galadriel Merry Frodo

​my_set.update(set({"Saruman", "Frodo", "Gandalf"})) # adds to my_set elements from another set
print(my_set)
Sam Pippin Galadriel Frodo Merry Saruman Gandalf

[Sergpoipoip]

after the execution of the provided operations with my_set this variable will store the set {'Saruman', 'Merry', 'Frodo', 'Sam', 'Gandalf', 'Pippin', 'Galadriel'}

[simocasaz]

a_set = {"Bilbo", "Frodo", "Sam", "Pippin", "Merry"}
my_set.remove("Bilbo") # The item "Bilbo" is no longer in the set
​my_set.add("Galadriel") # The item "Galadriel" has been added to the set
​my_set.update(set({"Saruman", "Frodo", "Gandalf"})) # The items "Saruman" and "Gandalf" are now in the set. The item "Frodo" has not been added, since it was already present in my_set

[Chiaramartina]

my_set = {"Bilbo", "Frodo", "Sam", "Pippin", "Merry"}
my_set.remove("Bilbo")
#Bilbo has been removed
my_set.add("Galadriel")
#Galadriel has been added
my_set.update(set({"Saruman", "Frodo", "Gandalf"}))
#The set was updated with new elements but "Frodo" wasn't repeated
print (my_set)

my_set={'Frodo', 'Sam', 'Merry', 'Saruman', 'Galadriel', 'Pippin', 'Gandalf'}

[matildepassafaro]

my_set = {"Sam", "Pippin", "Bilbo", "Frodo", "Merry"}

status of my_set after the execution of my_set.remove("Bilbo"):
my_set = {"Sam", "Pippin", "Frodo", "Merry"}

status of my_set after the execution of my_set.add("Galadriel"):
my_set = {"Sam", "Pippin", "Galadriel", "Frodo", "Merry"}

status of my_set after the execution of my_set.update(set({"Saruman", "Frodo", "Gandalf"})):
my_set = {"Sam", "Gandalf", "Pippin", "Saruman", "Galadriel", "Frodo", "Merry"}

[CarlaMenegat]

[VirginiaDa00]

[essepuntato]

Thanks for your takes. Just one comment:

• @Liber-R @katyakrsn @simocasaz, you did not say what is the final output.

[annapasetto0]

my_set = set()
my_set.add("Bilbo")
my_set.add("Frodo")
my_set.add("Sam")
my_set.add("Pippin")
my_set.add("Merry")

my_set.remove("Bilbo") #Bilbo is removed (Frodo, Sam, Pippin, Merry)
my_set.add("Galadriel") #Galadriel is added to the set (Frodo, Sam, Pippin, Merry, Galadriel)
my_set.update(set({"Saruman", "Frodo", "Gandalf"})) #Saruman and Gandalf are now in my_set

print(my_set)

#output: {'Saruman', 'Frodo', 'Galadriel', 'Gandalf', 'Merry', 'Sam', 'Pippin'}