Python

Python - Sets 

Python Sets:

A set is created by placing all the items (elements) inside curly braces {}, separated by a comma, or by using the built-in set() function.

It can have any number of items and they may be of different types (integer, float, tuple, string, etc.). But a set cannot have mutable elements like lists, sets, or dictionaries as its elements.

• Sets are an unordered collection of unique elements. We can construct them by using the set() function.

• Sets cannot contain duplicates.

• Sets are mutable like lists.

• You can create a non-empty set with curly braces by specifying elements separated by a comma.
• Set items can be of any data type.
• Sets can be any data type.

Example:

set1 = ("apple", "banana", "cherry")
set2 = {1, 5, 7, 9.0, 3.9,'abc','cde'}
set3 = (1,2,3,4,5)

Empty_set = set()

Python Sets Functions and methods:

add()

• add( ) - the method adds an element to the set.

• This method takes the element to be added as an argument to the given set.

Example:

set_1  =  set()
set_1.add('hi!')
print(set_1)

Result:
{'hi!'}

update()




• update( ) - the method helps to add multiple elements to a set.

Example:

set_2 = {5,7,9,3}
set_2.update([2, 3, 4])
print(set_2)

Result:
{2, 3, 4, 5, 7, 9}

remove()




• Use remove( ) to remove an item/element from the set.

• By default remove( ), removes the specified element from the set.

• remove( ), takes the element as an argument.

Example:

set_3 = {1,6,34,12,32,46,'a','g','h'}
set_3.remove(46)
print(set_3)

Results:
{1, 12, 32, 34, 6, 'a', 'g', 'h'}

dict()




• We can also create dictionary objects from a sequence of items that pair. This can be done using the  - dict( ) method.

• dict( ), the function takes the list of paired elements as an argument in the list of tuples.

Example:

state_city = [ ( 'Andhrapradesh',' Visakhapatnam'),('Karnataka','Bangaluru'),('Telangana','Hyderabad')]

state_city = dict(state_city)

print(state_city)

Result:

{'Andhrapradesh': ' Visakhapatnam', 'Karnataka': 'Bangaluru', 'Telangana': 'Hyderabad'}

pop()




• pop( )- the method removes and returns an element from a dictionary having the given key.

• This method takes two arguments/parameters (i) key - key which is to be searched for removal, (ii) default - value which is to be returned when the key is not in the dictionary.

Example:

state_city = {'Andhrapradesh': ' Visakhapatnam', 'Karnataka': 'Bangaluru', 'Telangana': 'Hyderabad'}
state_city.pop("Telangana")
print(state_city)

Result:

{'Andhrapradesh': ' Visakhapatnam', 'Karnataka': 'Bangaluru'}

This is all about Python Sets, If any doubts comment down.

You can also read below...

1. History of Python

2. Python Integers, Floats.

3. Python -Booleans and variables

4. Python Strings

5. Basic programs in python.

6. Python Lists

7. Python Tuples