How can I check if a Python list is empty?
Python, List · Jan 15, 2023
Checking the emptiness of a Python list is rather easy using the
len() function. Yet, there's another technique that works on all types of sequences and collections. This is based on the truth value testing of the sequence or collection itself.
By default, a Python object is considered truthy unless its class defines either a
__bool__() or a
__len__() method that returns
0 respectively. Python's built-in objects, such as tuples, lists, strings, dictioners, sets and ranges all implement a
__len__() method. This menas that truth value testing of these objects will return
False if they are empty, and
Based on these observations, all you need to check if a Python list is empty is to test its truth value, using the
x =  not x # True y = [1, 2] not y # False
Written by Angelos Chalaris
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