180.To Lower Case

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题目

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

Example 1:

Input: “Hello”
Output: “hello”
Example 2:

Input: “here”
Output: “here”
Example 3:

Input: “LOVELY”
Output: “lovely”

链接

https://leetcode.com/problems/to-lower-case/

分析

直接用代码库中的方法或者采用逐个字符转换的形式。

代码

class Solution {
    public String toLowerCase(String str) {
        return str.toLowerCase();
        
    }
}

class Solution(object):
    def toLowerCase(self, str):
        """
        :type str: str
        :rtype: str
        """
        return str.lower()

class Solution(object):
    def toLowerCase(self, str):
        """
        :type str: str
        :rtype: str
        """
        lower = [chr(i) for i in range(97,123)]
        upper = [chr(i) for i in range(65,91)]
        re = []
        for i in range(0, len(str)):
            if str[i] in upper:
                re.append(lower[upper.index(str[i])])
            else:
                re.append(str[i])
        return ''.join(re)