Python逐行合并两个文件内容

描述：

　　1.txt内容（IP地址）

192.168.1.212
192.168.1.213
192.168.1.214
192.168.1.215

　　2.txt内容（主机描述）

测试数据库-DB01
测试数据库-DB02
测试-APP01
测试-APP02

1、第一版（错误）　

with open('E:/1.txt') as f1,open('E:/2.txt',encoding='UTF-8') as f2:
    for line in f1.readlines():
        print(line.strip('
'))
    for newline in f2.readlines():
        print(newline.strip('
'))
        with open('E:/b.txt', 'a') as i:
            i.write("""HOSTNAME:{IP}
NAME:{HOST}
IP:{IP}
    
""".format(IP=line.strip('
'),HOST=newline.strip('
')))

问题：IP相同，都为1.txt中的最后一个IP。

2、第二版（正确）

def read_file(filename):
    with open(filename, encoding='utf-8') as file_obj:
        for line in file_obj:
            yield line.strip()
def write_fiel(filename,mode='a'):
    with open(filename,mode,encoding='utf-8') as file_obj:
        f1 = read_file('E：/1.txt')
        f2 = read_file('E:/2.txt')
        try:
            while True:
                file_obj.write("""HOSTNAME:{IP}
NAME:{HOST}
IP:{IP}

""".format(IP=next(f1).strip('
'), HOST=next(f2).strip('
')))
        except StopIteration:
            pass
if __name__ == '__main__':
     write_fiel('E:/3.txt')

3、第三版（和第二版没什么区别）

def read_file (filename):
    with open(filename, encoding='utf-8') as file_obj:
        for line in file_obj:
            yield line.strip()

with open('E:/b.txt', 'a') as i:
    f11 = read_file('E:/1.txt')
    f22= read_file('E:/2.txt')
    try:
        while True:
            i.write("""HOSTNAME:{IP}
NAME:{HOST}
IP:{IP}
    
""".format(IP=next(f11).strip('
'),HOST=next(f22).strip('
')))
    except StopIteration:
        pass