python将文本中的空格替换为换行的方法

# -*- coding: utf-8 -*-
'''
遇到文中的空格就换行
'''
def delblankline(infile, outfile):
 infopen = open(infile, 'r',encoding="utf-8")
 outfopen = open(outfile, 'w',encoding="utf-8")
 db = infopen.read()
 outfopen.write(db.replace(' ','\n'))
 infopen.close()
 outfopen.close()

delblankline("jb51.txt", "o3.txt")

#!/usr/bin/python3
 
str = "欢迎访问www.jb51.net"
print ("旧地址：", str)
print ("新地址：", str.replace("jb51.net", "jbzj.com"))
 
str = "this is string example....wow!!!"
print (str.replace("is", "was", 3))