Python learning--max and reduce functions

Question: I have a list of these:

1	[' a.b.c.d11u.e.f.g ', ' e.f88.g ', ' caa3.z.brr ', ' z.48.ff.ee ']

Need to find the most node (between nodes by. Split)

Seemingly simple work, to do it in a pythonic way, or to some degree of Python's built-in functions, such as the most familiar with the max, but you will use it is not commonly used optional parameters: key

1 2	Node_list = [' a.b.c.d11u.e.f.g ', ' e.f88.g ', ' caa3.z.brr ', ' z.48.ff.ee '] max_node = max (Node_list, Key=lambda N: N.count ('. '))

Here, the method of using the key parameter to change the max comparison list element achieves the goal of accomplishing the task.

By the way, another one is not a lot of built-in functions: reduce, use it to solve this problem

1 2	Node_list = [' a.b.c.d11u.e.f.g ', ' e.f88.g ', ' caa3.z.brr ', ' z.48.ff.ee '