字符串中的单词数

1、问题描述
统计字符串中的单词个数，其中一个单词定义为不含空格的连续字符串。

2、问题示例
输入"Hello, my name is John."，输出5。

3、代码实现

class Solution:
    def countSegments(self, s):
        res = 0
        for i in range(len(s)):
            if s[i] != ' ' and (i == 0 or s[i-1] == ' '):
                res += 1
        return res

if __name__ == '__main__':
    solution = Solution()
    n = "Hello, my name is John."
    msg = solution.countSegments(n)
    print(msg)