Web Reference: May 2, 2025 · There are several methods to determine the length of a list in Python. For example, consider a list l = [1, 2, 3, 4, 5], length of this list is 5 as it contains 5 elements in it. Let's explore different methods to find the length of a list with examples. Everything in Python is an object, including lists. All objects have a header of some sort in the C implementation. Lists and other similar builtin objects with a "size" in Python, in particular, have an attribute called ob_size, where the number of elements in the object is cached. So checking the number of objects in a list is very fast. But if y... Nov 14, 2025 · In this example, we create a list my_list with five elements. Then, we use the len() function to calculate its length and store the result in the variable list_length. Finally, we print the length of the list. The len() function is not only simple to use but also highly optimized.
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