How to use the len() function in Python

To use the len() function in Python, you simply pass an object as an argument, and len() will return the number of items in that object. Here are some examples:

Getting the length of a string:

s = "Hello, world!"
length = len(s)
print(length)  # output: 13

Getting the length of a list:

my_list = [1, 2, 3, 4, 5]
length = len(my_list)
print(length)  # output: 5

Getting the length of a dictionary:

my_dict = {"a": 1, "b": 2, "c": 3}
length = len(my_dict)
print(length)  # output: 3

Note that the len() function only works with objects that have a defined length, such as strings, lists, and dictionaries, among others. If you try to use len() with an object that doesn’t have a defined length, you’ll get a TypeError exception.