LeetCode face questions 05. Alternatively spaces (Python)

Topic

Source: stay button (LeetCode)
link: https: //leetcode-cn.com/problems/ti-huan-kong-ge-lcof

Solution one: the use Python replace () function. replace () Syntax: str.replace (old, new [, max]), replace the old string new, alternatively no more than the number of times max

class Solution:
    def replaceSpace(self, s: str) -> str:
        return s.replace(" ","%20")

Solution two: s to convert a string list, the list will replace spaces "20%", using the join () splice string, the string is returned after splicing, str.join (sequence), sequence is to be connected character sequences, splicing in accordance with the specified format

class Solution:
    def replaceSpace(self, s: str) -> str:
        arr = [str(x) for x in s]
        for i in range(len(arr)):
            if arr[i]==" ":
                arr[i] = "%20"
        return ''.join(arr)

Solution three: Converts a string into a list of s, the spaces in the replacement list, "20%" and "+" sign string concatenation string returned splicing

class Solution:
    def replaceSpace(self, s: str) -> str:
        arr = [str(x) for x in s]
        for i in range(len(arr)):
            if arr[i] == " ":
                arr[i] = "%20"
        str1 = ""
        for i in arr:
            str1 += i
        return str1