剑指offer-替换空格

请实现一个函数，将一个字符串中的空格替换成“%20”。例如，当字符串为We Are Happy.则经过替换之后的字符串为We%20Are%20Happy。

class Solution:
# s 源字符串
def replaceSpace(self, s):
# write code here
sList = []
for i in s:
if i == ' ':
sList.append('%20')
else:
sList.append(i)
return ''.join(sList)

知识点：python关于list和str之间的转化

str-->list

str1 = "12345"
list1 = list(str1)
print list1

str2 = "123 sjhid dhi"
list2 = str2.split() #or list2 = str2.split(" ")
print list2

str3 = "www.google.com"
list3 = str3.split(".")
print list3

输出为：

['1', '2', '3', '4', '5']
['123', 'sjhid', 'dhi']
['www', 'google', 'com']

list-->str

str4 = "".join(list3)
print str4
str5 = ".".join(list3)
print str5
str6 = " ".join(list3)
print str6

输出为：

wwwgooglecom
www.google.com
www google com

参考链接

https://blog.csdn.net/roytao2/article/details/53433373