小编SR *_*ery的帖子

如何编写代码来检查电子邮件是否存在？例如,donkey_sdh123 @ gmail.com,donkey_sdh123 @ yahoo.com或donkey_sdh123@lycos.com所有这些电子邮件都不存在于gmail,yahoo和lycos数据库中.

查看截图.donkey_sdh123@gmail.com很糟糕.这意味着它不存在.我怎样才能在我的项目中实现相同的功能？

欢迎使用javascript,jquery shell脚本,c或c ++.没有.net.

我的 XML ：

<books>
<book name="goodbook" cost="10" color="green"></book>
<book name="badbook" cost="1000" weight="100"></book>
<book name="avgbook" cost="99" weight="120"></book>
</books>

我的python代码：-

import xml.etree.ElementTree as ET
import sys
doc       = ET.parse("books.xml")
root      = doc.getroot() 
root_new  = ET.Element("books") 
for child in root:
       name                = child.attrib['name']
       cost                = child.attrib['cost']
       color               = child.attrib['color'] #KeyError
       weight              = child.attrib['weight'] #KeyError
       # create "book" here
       book    = ET.SubElement(root_new, "book") 
       book.set("name",name)               
       book.set("cost",cost) 
       book.set("color",color) 
       book.set("weight",weight)
tree = ET.ElementTree(root_new)
tree.write(sys.stdout)

出现什么错误：-

python books.py 
Traceback (most recent call last):
  File "books.py", line 10, in …

我有一个程序，但它不包含类概念（Python 程序遵循类概念的一些价值）实际上是 Python 世界中的一个新程序。所以从原始的方式学习帮助我在这个世界上闪耀。任何人都可以帮助我，而不是给这个问题打负分:(

 import xml.etree.ElementTree as ET
 import sys

doc       = ET.parse("books.xml")
root      = doc.getroot() 
root_new  = ET.Element("books") 
for child in root:
    name                = child.attrib['name']
    cost                = child.attrib['cost']
    # create "book" here
    book    = ET.SubElement(root_new, "book") 
    book.set("name",name)               
    book.set("cost",cost) 
    if 'color' in child.attrib:
        color               = child.attrib['color']
        book.set("color",color) 
    if 'weight' in child.attrib:
        weight              = child.attrib['weight']
        book.set("weight",weight)
    for g in child.findall("cover"):
        # create "group" here
       cover     = ET.SubElement(cover,"cover")  
        if g.text != "goldcover":
            cover.text = g.text 
tree = ET.ElementTree(root_new)
tree.write(sys.stdout)

为了理解：我的 xml 是， …