Python

add method in set

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add method in set - Python

Add method is used to add elements in an empty set.

When we call the add method we pass an element as an argument.

Python calculates the hash code for that element using the hash function, if an element with the same hash code is already present in a set then it does not add the element.

We can not pass mutable data types(e.g. list, tuple, etc.) as an argument of the add method.

Add takes exactly one argument which means we can add only one element at one time.

The time complexity of the add method is constant or O(1).

Syntax –

set_name.add(element)

element → It is a required argument, we have to pass one element each time when we call add method.

Example 1 – let’s see an example

				
					my_set = set()
my_set.add(1)
my_set.add(2)
my_set.add(3)
print(my_set)
# Output - 
# {1,2,3}

In the above example, first we create an empty set using the set function and store it in the my_set variable.

After creating an empty set first we add 1 in my_set using the .add() method.

After adding 1 we also add 2 and 3 in my_set.

After that print my_set using the print() function.

Example 2-

				
					my_set2={10,20,30}
my_set2.add(40)
my_set2.add(20)
print(my_set2)

# Output-
# {40, 10, 20, 30}

In the above example, we see that we couldn’t add ’20’ in my_set2 because 20 is already present in my_set2.

Example 3-

				
					my_set3={'this','is','edSlash'}
my_set3.add('Hello')
print(my_set3)
my_set3.add('anurag','dubey')  #will give an error think about it.

# Output - 
# {'Hello','this','is','edSlash'} # may be your output in a different order
# Traceback (most recent call last):
  # File "/home/main.py", line 4, in <module>
    # my_set3.add('anurag','dubey')  
# TypeError: set.add() takes exactly one argument (2 given)

In the above example, line 4 gives an error because we passed two arguments to the add method.

You can use the update method to add multiple elements in a set at one time.

Example 4-

				
					my_set4={'a','b','c','d'}
my_set4.add(('e','f','g'))
print(my_set4)

# Output -
# {'a', ('e', 'f', 'g'), 'c', 'd', 'b'}

Example 5-

				
					my_set5 = set()
for i in range(1, 6):
    my_set5.add(i)
print(my_set5) 

# Output -
# {1,2,3,4,5}

In the above example, we see that we can also add elements in a set using the for loop method.

Python

add method in set

add method in set - Python

Example 2-

Example 3-

Example 4-

Example 5-

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