Full name
len
Library
Built-in
Syntax
len(s)
Description
The len function returns the length (the number of elements) of an object. The argument can be a sequence (such as a string, bytes, tuple, list, or range) or a collection (such as a dictionary, set, or frozen set).
Parameters
- s: Object whose elements we want to count.
Result
The len function returns an integer.
Examples
This first example counts the number of characters in a text string:
print(len("Python"))
It can also be used to count the number of items in a dictionary:
d = dict([("one", 1), ("two", 2)])
print(len(d))
In this example the function returns the number of elements in a list:
m = ["a", "b", 1, 2, "c"]
print(len(m))
