[python]:T9键盘_micropython t9输入

在老式手机上，用户通过数字键盘输入，手机将提供与这些数字相匹配的单词列表。每个数字映射到0至4个字母。给定一个数字序列，实现一个算法来返回匹配单词的列表。你会得到一张含有有效单词的列表。映射如下图所示：



示例 1:

输入: num = "8733", words = ["tree", "used"]
输出: ["tree", "used"]
示例 2:

输入: num = "2", words = ["a", "b", "c", "d"]
输出: ["a", "b", "c"]
提示：

num.length <= 1000
words.length <= 500
words[i].length == num.length
num中不会出现 0, 1 这两个数字
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一、常规法
遍历words与num一一对比

class Solution:
    def getValidT9Words(self, num: str, words: List[str]) -> List[str]:
        table = {'2': 'abc', '3': 'def', '4': 'ghi', '5': 'jkl', '6': 'mno', '7': 'pqrs', '8': 'tuv', '9': 'wxyz'}
        return list(filter(lambda word: all(ch in table[key] for key, ch in zip(num, word)), words))
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二、正则表达

class Solution:
    def getValidT9Words(self, num: str, words: List[str]) -> List[str]:
        pattern = ["[a-c]", "[d-f]", "[g-i]", "[j-l]", "[m-o]", "[p-s]", "[t-v]", "[w-z]"]
        lnum = len(num)
        sb = ""
        for i in range(lnum):
            sb += pattern[int(num[i])-2]
        res = []
        for word in words:
           if re.match(sb, word):
               res.append(word)
        return res
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