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<h2 class="title"><a name="soap.firststeps"></a>12.3. 步入 <span class="acronym">SOAP</span></h2>
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<div class="abstract">
<p>调用远程函数是 <span class="acronym">SOAP</span> 的核心功能。有很多提供公开 <span class="acronym">SOAP</span> 访问的服务器提供用于展示的简单功能。
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<p>最受欢迎的 <span class="acronym">SOAP</span> 公开访问服务器是 <a href="http://www.xmethods.net/">http://www.xmethods.net/</a>。这个例子使用了一个展示函数，可以根据美国邮政编码返回当地气温。
</p>
<div class="example"><a name="d0e30453"></a><h3 class="title">例 12.6. 获得现在的气温</h3><pre class="screen">
<tt class="prompt">>>> </tt><span class="userinput"><span class='pykeyword'>from</span> SOAPpy <span class='pykeyword'>import</span> SOAPProxy</span> <a name="soap.firststeps.1.1"></a><img src="../images/callouts/1.png" alt="1" border="0" width="12" height="12">
<tt class="prompt">>>> </tt><span class="userinput">url = <span class='pystring'>'http://services.xmethods.net:80/soap/servlet/rpcrouter'</span></span>
<tt class="prompt">>>> </tt><span class="userinput">namespace = <span class='pystring'>'urn:xmethods-Temperature'</span></span> <a name="soap.firststeps.1.2"></a><img src="../images/callouts/2.png" alt="2" border="0" width="12" height="12">
<tt class="prompt">>>> </tt><span class="userinput">server = SOAPProxy(url, namespace)</span> <a name="soap.firststeps.1.3"></a><img src="../images/callouts/3.png" alt="3" border="0" width="12" height="12">
<tt class="prompt">>>> </tt><span class="userinput">server.getTemp(<span class='pystring'>'27502'</span>)</span> <a name="soap.firststeps.1.4"></a><img src="../images/callouts/4.png" alt="4" border="0" width="12" height="12">
<span class="computeroutput">80.0</span>
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<td width="12" valign="top" align="left"><a href="#soap.firststeps.1.1"><img src="../images/callouts/1.png" alt="1" border="0" width="12" height="12"></a>
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<td valign="top" align="left">你通过 <tt class="classname">SOAPProxy</tt> 这个代理 (proxy) 类访问远程 <span class="acronym">SOAP</span> 服务器。这个代理处理了所有的 <span class="acronym">SOAP</span> 内部事务，其中包括：根据函数名和参数列表创建 XML 请求文档，并将这个请求文档通过 HTTP 发送到远程 <span class="acronym">SOAP</span> 服务器；解析 XML 返回文档，并创建本地的 <span class="application">Python</span> 返回值。在下一节中你将看到这个 XML 文档。
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<td valign="top" align="left">每个 <span class="acronym">SOAP</span> 服务都有一个 <span class="acronym">URL</span> 用以处理所有请求。相同的 <span class="acronym">URL</span> 可以用于所有的函数请求。每个特定服务则只有一个函数。但稍后你将看到的 Google <span class="acronym">API</span> 却有多个函数。这个服务的 <span class="acronym">URL</span> 提供给所有函数分享。每个 <span class="acronym">SOAP</span> 服务都有一个命名空间 (namespace)，这个命名空间是由服务器任意命名的。这不过是为调用 <span class="acronym">SOAP</span> 方法设置的。它使得服务器让多个不相关的服务共享服务 <span class="acronym">URL</span> 和路径请求成为可能。这与 <span class="application">Python</span> 中模块相对于<a href="../xml_processing/packages.html" title="9.2. 包">包</a>的关系类似。
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<td width="12" valign="top" align="left"><a href="#soap.firststeps.1.3"><img src="../images/callouts/3.png" alt="3" border="0" width="12" height="12"></a>
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<td valign="top" align="left">这里你创建了包含服务 <span class="acronym">URL</span> 和服务命名空间的 <tt class="classname">SOAPProxy</tt>。此时还不会连接到 <span class="acronym">SOAP</span> 服务器；仅仅是建立了一个本地 <span class="application">Python</span> 对象。
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<td width="12" valign="top" align="left"><a href="#soap.firststeps.1.4"><img src="../images/callouts/4.png" alt="4" border="0" width="12" height="12"></a>
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<td valign="top" align="left">到此为止，如果你的设置完全正确，应该可以向调用本地函数一样调用远程 <span class="acronym">SOAP</span> 方法。这和给普通函数传递参数并接收返回值一样，但在背后却隐藏着很多的工作。
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<p>让我们看一看这些背后的工作。</p>
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