How do I get the number of elements in a list in Python?
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The
len()
function can be used with several different types in Python – both built-in types and library types. For example:How to get the size of a list?
To find the size of a list, use the builtin function,
len
:And now:
returns 3.
Explanation
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 you’re checking if list size is zero or not, don’t uselen
– instead, put the list in a boolean context – it treated as False if empty, True otherwise.