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POPython - object attribute assignment fails
 

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  1. POPython - object attribute assignment fails
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    <p><strong>My question is</strong>, after this line: <code>-&gt; self.__serverUrl = serverUrl</code></p> <p>Why is this the case?: <code>*** AttributeError: Client instance has no attribute '__serverUrl'</code></p> <p><strong>Details</strong></p> <p>I'm using Beatbox to interact with Salesforce and I was getting an error </p> <p><code>*** AttributeError: Client instance has no attribute '_Client__serverUrl'</code></p> <p>I wondered why this field was being accessed before it was set, so I added <code>pdb.set_trace()</code> thinking I could find some answers. This is what I saw (note line 67):</p> <pre><code>(Pdb) --Call-- &gt; /app/env/local/lib/python2.7/site-packages/beatbox/_beatbox.py(65)useSession() -&gt; def useSession(self, sessionId, serverUrl): (Pdb) l 64 # initialize from an existing sessionId &amp; serverUrl, useful if we're being launched via a custom link 65 -&gt; def useSession(self, sessionId, serverUrl): 66 self.sessionId = sessionId 67 self.__serverUrl = serverUrl 68 (scheme, host, path, params, query, frag) = urlparse(self.__serverUrl) 69 self.__conn = makeConnection(scheme, host) 70 </code></pre> <p>I check the value of serverUrl, and all is as it should be. Then I get to line 67, let it execute and think that the value of <code>serverUrl</code> would be in <code>self.__serverUrl</code>. Apparently not....</p> <pre><code>&gt; /app/env/local/lib/python2.7/site-packages/beatbox/_beatbox.py(67)useSession() -&gt; self.__serverUrl = serverUrl (Pdb) n &gt; /app/env/local/lib/python2.7/site-packages/beatbox/_beatbox.py(68)useSession() -&gt; (scheme, host, path, params, query, frag) = urlparse(self.__serverUrl) (Pdb) self.__serverUrl *** AttributeError: Client instance has no attribute '__serverUrl' </code></pre> <p>What is happening here!? This shouldn't be happening. It looks like the assignment is just quietly failing. Why is this value not being assigned here? </p> <p><strong>The Source</strong></p> <p>The source code I'm working with is <a href="http://code.google.com/p/salesforce-beatbox/source/browse/" rel="nofollow">here</a></p> <p>I create a beatbox client and login</p> <pre><code>svc = PythonClient() svc.login(username, password) </code></pre> <p>This calls the login method of python_client.Client. python_client.Client.login calls the login method of it's superclass _beatbox.Client, which looks like this:</p> <pre><code>class Client: def __init__(self, serverUrl=None): ... # login, the serverUrl and sessionId are automatically handled, returns the loginResult structure def login(self, username, password): lr = LoginRequest(self.serverUrl, username, password).post() self.useSession(str(lr[_tPartnerNS.sessionId]), str(lr[_tPartnerNS.serverUrl])) return lr # initialize from an existing sessionId &amp; serverUrl, useful if we're being launched via a custom link def useSession(self, sessionId, serverUrl): self.sessionId = sessionId self.__serverUrl = serverUrl (scheme, host, path, params, query, frag) = urlparse(self.__serverUrl) self.__conn = makeConnection(scheme, host) </code></pre> <p>The assginment happens in _beatbox.Client.useSession, which is the superclass of the object <code>svc</code></p>
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    1. COwhich is it? is it '_Client__serverUrl' or `__serverUrl`? You might be a victim of name mangling ...
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      1. POPython - object attribute assignment fails
      1. USmgilson
    2. COOutside of this method, it's _Client_serverUrl, inside the method it's _serverUrl. Name mangling doesn't happen inside class methods does it?
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