无法在lxml.objectify中设置子值

Question

我正在尝试使用使用XML的restful接口。我已经将XML库的选择缩小到了两个。

基于文档，lxml.objectify似乎是我的首选选择，但我正在挣扎。

Xmltodict似乎产生了更多的打字，可能是较少的丙酮，但我似乎能够取得更大的进展。

我有一个两个都做过的例子。Xmltodict正在工作，但使用xml.objectify，我似乎找不出如何访问/更改凭据的子元素。我的假设是，我可以使用点表示法下到用户名和密码，但我没有成功。

首先，xmltodict代码：

    from requests import post
import xmltodict
import pprint

pp=pprint.PrettyPrinter(indent=2)

req = '''<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
     <soap:Header>
          <HTNGHeader xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://htng.org/1.1/Header/">
               <From>
                    <Credential>
                         <password>PASSWORD</password>
                         <userName>UNAME</userName>
                    </Credential>
                    <systemId>2</systemId>
                </From>
                <To>
                     <systemId>2178</systemId>
                </To>
         </HTNGHeader>
     </soap:Header>
     <soap:Body />
</soap:Envelope>
'''

pwd = 'password'
uname = 'username'
url = 'https://url.com'

soap = xmltodict.parse(req)
soap['soap:Envelope']['soap:Header']['HTNGHeader']['From']['Credential']['password'] = pwd
soap['soap:Envelope']['soap:Header']['HTNGHeader']['From']['Credential']['userName'] = uname

soap_post = xmltodict.unparse(soap)

res = post(url, data=soap_post)

res_dict = xmltodict.parse(res.text)
pp.pprint(res_dict)

现在，lxml.objectify。

    from requests import post
from lxml import etree, objectify
import pprint

pp=pprint.PrettyPrinter(indent=2)

req = '''<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
     <soap:Header>
          <HTNGHeader xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://htng.org/1.1/Header/">
               <From>
                    <Credential>
                         <password>PASSWORD</password>
                         <userName>UNAME</userName>
                    </Credential>
                    <systemId>2</systemId>
                </From>
                <To>
                     <systemId>2178</systemId>
                </To>
         </HTNGHeader>
     </soap:Header>
     <soap:Body />
</soap:Envelope>
'''

request_doc = req.encode('utf-8')

pwd = 'password'
uname = 'username'
url = 'https://url.com

soap = objectify.fromstring(request_doc)

#here is my problem
soap.Header.HTNGHeader.From.Credential.userName = uname
soap.Header.HTNGHeader.From.Credential.password = pwd

soap_post = etree.tostring(soap)

url = 'https://connect.channelrush.net/reservationreceive/pickup?providerId=2'

res = post(url, data=soap_post)

res_obj = objectify.fromstring(res.text.encode('utf-8'))

pp.pprint(res.text)

对于lxml.objectify，我得到以下异常：

File "f:\Dropbox\pms\channel_rush_interface_objectify.py", line 36, in <module>
  soap.Header.HTNGHeader.From.Credential.userName = uname
File "c:\Python34\Lib\site-packages\lxml\objectify.pyd", line 230, in lxml.objectify.ObjectifiedElement.__getattr__ (src\lxml\objectify.c:4443)
File "c:\Python34\Lib\site-packages\lxml\objectify.pyd", line 451, in lxml.objectify._lookupChildOrRaise (src\lxml\objectify.c:7228)

builtins.AttributeError: no such child: {http://schemas.xmlsoap.org/soap/envelope/}HTNGHeader

有人能指出我如何让lxml.objectify工作吗？我应该坚持使用xmltodict吗？

Answer 1

来自lxml.objectify文档

在标记查找期间，名称空间主要是在幕后处理的。如果您访问元素的子元素而不指定命名空间，则查找将使用父元素的命名空间。..。要访问与其父名称空间不同的元素，可以使用getattr() .为了方便起见，还有一种快速通过项目访问的方法。除去的例子

在你的例子中，试着：

soap.Header["{http://htng.org/1.1/Header/}HTNGHeader"].From.Credential.userName = uname
soap.Header["{http://htng.org/1.1/Header/}HTNGHeader"].From.Credential.password = pwd