Python Dictionary clear()
Last Updated :
13 Dec, 2022
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The clear() method removes all items from the dictionary.
Syntax:
dict.clear()
Parameters:
The clear() method doesn't take any parameters.
Returns:
The clear() method doesn't return any value.
Parameters:
The clear() method take O(n) time.
Examples:
Input : d = {1: "geeks", 2: "for"}
d.clear()
Output : d = {}
Error:
As we are not passing any parameters there is no chance for any error.
Python3
# Python program to demonstrate working of# dictionary clear()text = {1: "geeks", 2: "for"}text.clear()print('text =', text) |
Output:
text = {}
How is it different from assigning {} to a dictionary? Please refer the below code to see the difference. When we assign {} to a dictionary, a new empty dictionary is created and assigned to the reference. But when we do clear on a dictionary reference, the actual dictionary content is removed, so all references referring to the dictionary become empty.
Python3
# Python code to demonstrate difference# clear and {}.text1 = {1: "geeks", 2: "for"}text2 = text1# Using clear makes both text1 and text2# empty.text1.clear()print('After removing items using clear()')print('text1 =', text1)print('text2 =', text2)text1 = {1: "one", 2: "two"}text2 = text1# This makes only text1 empty.text1 = {}print('After removing items by assigning {}')print('text1 =', text1)print('text2 =', text2) |
Output:
After removing items using clear()
text1 = {}
text2 = {}
After removing items by assigning {}
text1 = {}
text2 = {1: 'one', 2: 'two'}
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