What is the result of `len([1, 2, 3])` in Python?

The function len() in Python is used to determine the number of items in an object, such as a list, tuple, string, or dictionary. When you apply len() to a list like [1, 2, 3], it counts the number of elements present in that list. In this case, the list contains three elements: 1, 2, and 3. Therefore, when you call len([1, 2, 3]), the result will be 3. This reflects the fact that there are three items in the provided list.