python set

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Opulent Owl answered on February 1, 2020 Popularity 10/10 Helpfulness 1/10

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my_set = set() # Use this to declare an empty set in python
my_set = {"apple", "orange"} # Use this to declare a set in python

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Contributed on Jul 15 2022

Opulent Owl

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python sets

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# You can't create a set like this in Python
my_set = {} # ---- This is a Dictionary/Hashmap

# To create a empty set you have to use the built in method:
my_set = set() # Correct!


set_example = {1,3,2,5,3,6}
print(set_example)

# OUTPUT
# {1,3,2,5,6} ---- Sets do not contain duplicates and are unordered

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Contributed on Mar 15 2020

Wild Wasp

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python set

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# A set contains unique elements of which the order is not important
s = set()
s.add(1)
s.add(2)
s.remove(1)
print(s)
# Can also be created from a list (or some other data structures)
num_list = [1,2,3]
set_from_list = set(num_list)

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Contributed on Aug 21 2020

Arno Deceuninck

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python set &

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>>> A = {0, 2, 4, 6, 8};
>>> B = {1, 2, 3, 4, 5};

>>> print("Union :", A | B)  
Union : {0, 1, 2, 3, 4, 5, 6, 8}

>>> print("Intersection :", A & B)
Intersection : {2, 4}

>>> print("Difference :", A - B)
Difference : {0, 8, 6}

# elements not present both sets
>>> print("Symmetric difference :", A ^ B)   
Symmetric difference : {0, 1, 3, 5, 6, 8}

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Contributed on May 29 2020

Magnificent Mockingbird

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python sets

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empty_set = set()

basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}

# sets do not contain duplicates
print(basket)                      
# output {'orange', 'banana', 'pear', 'apple'}

# check if orange is in basket set
print('orange' in basket)
# output true

# convert a string to a set of letters - sets contains no duplicates
set_a = set('abcd')
set_b = set('bcde')

# the operations below returns new sets
# print letters in set_a but not in set_b - difference
print(set_a - set_b)
# output {'a'}

# print set letters that is in either set a or b - union
print(set_a | set_b)
# output {'a', 'c', 'e', 'b', 'd'}

# print letters that are in both set_a and set_b - intersection
print(set_a & set_b)
# output {'c', 'd', 'b'}

# print letters that are in set_a and set_b when the letters are found in a set but no the other set - symmetric_difference()
print(set_a ^ set_b)
# output {'a', 'e'}

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Contributed on Aug 22 2022

Jerome Scott

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set in python

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myNewSet = set()

myNewSet.add("what have you done")
myNewSet.add("to earn your place")
myNewSet.add("in this crowded world?")


"what have you done" in myNewSet		# ->	true
myNewSet.remove("to earn your place")
# ->	 myNewSet = {"what have you done", "in this crowded world?"}

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Contributed on Dec 14 2021

simondoesstuff

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python set

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set_example = {1, 2, 3, 4, 5, 5, 5}

print(set_example)

# OUTPUT
# {1, 2, 3, 4, 5} ----- Does not print repetitions

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Contributed on Feb 01 2020

Joyiscode

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sets in python

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set_of_base10_numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9, 0}
set_of_base2_numbers = {1, 0}

intersection = set_of_base10_numbers.intersection(set_of_base2_numbers)
union = set_of_base10_numbers.union(set_of_base2_numbers)

'''
intersection: {0, 1}:
	if the number is contained in both sets it becomes part of the intersection
union: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}:
	if the number exists in at lease one of the sets it becomes part of the union
'''

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Contributed on Aug 17 2020

TheRubberDucky

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set method in python

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# Creating an empty set
b = set()
print(type(b))

## Adding values to an empty set
b.add(4)
b.add(4)
b.add(5)
b.add(5) # Adding a value repeatedly does not changes a set
b.add((4, 5, 6))

## Accessing Elements
# b.add({4:5}) # Cannot add list or dictionary to sets
print(b)

## Length of the Set
print(len(b)) # Prints the length of this set

## Removal of an Item
b.remove(5) # Removes 5 fromt set b
# b.remove(15) # throws an error while trying to remove 15 (which is not present in the set)
print(b)

print(b.pop())
print(b)

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Contributed on Jan 12 2022

Coding boy Hasya

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set in python

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A_Set = {1, 2, "hi", "test"}

for i in A_Set: #Loops through the set. You only get the value not the index
  print(i) #Prints the current value

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Contributed on Dec 04 2020

pplew

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python sets

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# Python also has sets which you can use
# Keep in mind that sets cannot have duplicate of the same value
# This can be useful for removing doubles in a list

mySet = {1, 2, 2, 3, 4, 5, 10, 10, 15}
print(mySet) # {1, 2, 3, 4, 5, 10, 15}

# You can also create a set with 'set([list elements])'

myList = ['apples', 'bananas', 'oranges', 'grapes']
myList.append('apples')
myList.append('oranges')
print(myList) # ['apples', 'bananas', 'oranges', 'grapes', 'apples', 'oranges']

myNewSet = set(myList)
print(myNewSet) # {'apples', 'bananas', 'oranges', 'grapes'}

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Contributed on Apr 24 2022

Ninja Penguin

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