<p>Is there any example code of a <a href="http://www.python.org/" rel="noreferrer">cpython</a> (not IronPython) client which can call Windows Communication Foundation (WCF) service?</p>

Even if there is not a specific example of calling WCF from Python, you should be able to make a fully SOAP compliant service with WCF. Then all you have to do is find some examples of how to call a normal SOAP service from Python.
The simplest thing will be to use the BasicHttpBinding in WCF and then you can support your own sessions by passing a session token with each request and response.