題目：請(qǐng)實(shí)現(xiàn)一個(gè)函數(shù)侮叮，將一個(gè)字符串中的空格替換成 “%20”。例如酌媒，當(dāng)字符串為 We Are Happy. 則經(jīng)過替換之后的字符串為 We%20Are%20Happy候齿。
Python代碼如下：
class Solution:
def replaceSpace(self, s):
# method 1
return s.replace(' ','%20')
def replaceSpace2(self, s):
# method 2
news = ''
for item in s:
if item != ' ':
news += item
else:
news += "%20"
return news