Python

clear() method in dictionary

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clear() method in dictionary - Python

This method is used to clear all items from a dictionary or remove all items from a dictionary.

The .clear() method doesn’t take any argument and doesn’t return anything.

The time complexity of this method is O(n) where n is the number of items in the dictionary.

When we call this method with an empty dictionary then it does not give any error.

Syntax –

dictionary.clear()

Parameters –

argument → doesn’t take any argument

return → None(doesn’t return anything)

Example –

				
					my_dict={'1':'a','2':'b','3':'c','4':'d'}
print("Original Dictionary:",my_dict)

my_dict.clear()
print("Original Dictionary after clear:",my_dict)

# Output -
# Original Dictionary: {'1': 'a', '2': 'b', '3': 'c', '4': 'd'}
# Original Dictionary after clear: {}

In the above example ,first we create a dictionary with some elements and store it in my_dict variable.

After creating a dictionary print the original dictionary on the output screen.

Then removes all item from the dictionary using the .clear() method.

Finally, print the original empty dictionary on the output screen.

Example – Clear an empty dictionary

				
					dct={}
print("Original Dictionary:",dct)

dct.clear()
print("Original Dictionary after clear:",dct)

# Output -
# Original Dictionary: {}
# Original Dictionary after clear: {}

Example –

				
					my_dict={'name':'xyz', 'roll no':1,'year':4}
print("Original Dictionary:",my_dict)

return_value=my_dict.clear()
print("Original Dictionary after clear:",my_dict)
print("Return Value of clear method:",return_value)

# Output -
# Original Dictionary: {'name': 'xyz', 'roll no': 1, 'year': 4}
# Original Dictionary after clear: {}
# Return Value of clear method: None

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