How do I get the number of elements in a list (length of a list) in Python?

How do I get the number of elements in the list items?

items = ["apple", "orange", "banana"]

# There are 3 items.

The len() function can be used with several different types in Python - both built-in types and library types. For example:

>>> len([1, 2, 3])
3

Stack Overflow Q#1712227, score: 2989