In Python, you can find the length of a list using the built-in len() function. This function returns the number of items present in the list. To use it, simply pass the list as an argument to len(). For example, if you have a list my_list = [1, 2, 3, 4], you can find its length by writing len(my_list), which will return 4. The len() function works with other iterable data types as well, such as strings, tuples, and dictionaries, returning the count of elements in them.