Python sets

Sets are used to store multiple items in a single variable.

Set is one of 4 built-in data types in Python used to store collections of data, the other 3 are List, Tuple, and Dictionary, all with different qualities and usage.

A set is a collection which is both unordered and unindexed.

Sets are written with curly brackets.

Creating sets :

now we want to create a set call "my set" and define it from the beginning

that set includes strings. how we can do that ??

#creating sets
#set of strings
myset = {"apple", "banana", "cherry"}
print(myset)
{'banana', 'cherry', 'apple'}

A set can be strings, integers, and boolean values:

set1 = {"abc", 34, True, 40, "male"}

Type

we can use here type() function to tell us what is the type of the variable called myset

print(type(myset))
<class 'set'>

Access items

How we can access items of the set "set1" ??

first, we declare it .second we make a for loop to loop into every item of the set and print it out in the output

#Access items
set1= {True ,34 ,40 ,"male" ,"abc"}
for x in set1:
  print(x)

#output
True
34
40
male
abc

Python - Add Set Items

Adding item in the set can be done in many ways first we can do it with add function second we can do it with an update() function

Add

set1.add("orange")

print(set1)

#output
{True, 34, 40, 'male', 'abc', 'orange'}

update

thisset = {"apple", "banana", "cherry"}
tropical = {"pineapple", "mango", "papaya"}

thisset.update(tropical)

print(thisset)

#output
{'papaya', 'cherry', 'apple', 'pineapple', 'mango', 'banana'}

thisset = {"apple", "banana", "cherry"}
mylist = ["kiwi", "orange"]

thisset.update(mylist)

print(thisset)

#output
{'banana', 'cherry', 'apple', 'orange', 'kiwi'}

remove items

we can remove an item from the set be remove() function which removes the specific item from the set

thisset = {"apple", "banana", "cherry"}
​
thisset.remove("banana")
​
print(thisset)


#output
{'cherry', 'apple'}

thisset = {"apple", "banana", "cherry"}
​
thisset.remove("banana")
​
print(thisset)

#output
{'cherry', 'apple'}

we can also use pop() to remove the first item in the set

#pop()
​
thisset = {"apple", "banana", "cherry"}
​
x = thisset.pop()
​
print(x)
​
print(thisset)

#output
banana
{'cherry', 'apple'}