LeetCode--Length of Last Word (Python)

题目：Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example, 

Given s = "Hello World",

return 5.

知识：字符串

分析：1）去掉尾部的空格。2）从后往前计数直到遇到空字符为止。

Python实现：



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