Re: [python] get all messages of a thread

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+Date: Wed, 1 Jun 2011 15:35:35 +1000\r
+Message-ID: <BANLkTikEJ9dJ5kLg2QJQ+egHg2sh7S1wiA@mail.gmail.com>\r
+Subject: Re: [python] get all messages of a thread\r
+From: Brian May <brian@microcomaustralia.com.au>\r
+To: Patrick Totzke <patricktotzke@googlemail.com>\r
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+--bcaec52c5c8dce7d8804a49fe3bc\r
+Content-Type: text/plain; charset=ISO-8859-1\r
+\r
+On 28 May 2011 23:18, Patrick Totzke <patricktotzke@googlemail.com> wrote:\r
+\r
+>    if r: #because we cant iterate on NoneType\r
+>\r
+\r
+I don't understand why, but this line sets r._msgs to None. So it crashes,\r
+because it has no message ids to look for.\r
+\r
+If you change it to\r
+\r
+if r is not None:\r
+\r
+... then it works for me.\r
+\r
+Oh, I see, for your code, there is a implied call to __len__, and the\r
+__len__ function is completely broken for the reasons described in the\r
+documentation:\r
+\r
+      .. note:: As this iterates over the messages, we will not be able to=\r
+               iterate over them again! So this will fail::\r
+\r
+                 #THIS FAILS\r
+                 msgs = Database().create_query('').search_message()\r
+                 if len(msgs) > 0:              #this 'exhausts' msgs\r
+                     # next line raises\r
+NotmuchError(STATUS.NOT_INITIALIZED)!!!\r
+                     for msg in msgs: print msg\r
+\r
+               Most of the time, using the\r
+               :meth:`Query.count_messages` is therefore more\r
+               appropriate (and much faster). While not guaranteeing\r
+               that it will return the exact same number than len(),\r
+               in my tests it effectively always did so.\r
+\r
+\r
+\r
+-- \r
+Brian May <brian@microcomaustralia.com.au>\r
+\r
+--bcaec52c5c8dce7d8804a49fe3bc\r
+Content-Type: text/html; charset=ISO-8859-1\r
+Content-Transfer-Encoding: quoted-printable\r
+\r
+<div class=3D"gmail_quote">On 28 May 2011 23:18, Patrick Totzke <span dir=\r
+=3D"ltr">&lt;<a href=3D"mailto:patricktotzke@googlemail.com">patricktotzke@=\r
+googlemail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" s=\r
+tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">\r
+=A0 =A0if r: #because we cant iterate on NoneType<br></blockquote><div><br>=\r
+</div><div>I don&#39;t understand why, but this line sets r._msgs to None. =\r
+So it crashes, because it has no message ids to look for.</div><div><br></d=\r
+iv>\r
+<div>If you change it to</div><div><br></div><div>if r is not None:</div><d=\r
+iv><br></div><div>... then it works for me.=A0</div><div><br></div><div>Oh,=\r
+ I see, for your code, there is a implied call to __len__, and the __len__ =\r
+function is completely broken for the reasons described in the documentatio=\r
+n:</div>\r
+<div><br></div><div><div>=A0 =A0 =A0 .. note:: As this iterates over the me=\r
+ssages, we will not be able to=3D</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=\r
+iterate over them again! So this will fail::</div><div><br></div><div>=A0 =\r
+=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0#THIS FAILS</div>\r
+<div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0msgs =3D Database().create_query(&#=\r
+39;&#39;).search_message()</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if =\r
+len(msgs) &gt; 0: =A0 =A0 =A0 =A0 =A0 =A0 =A0#this &#39;exhausts&#39; msgs<=\r
+/div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0# next line raises Not=\r
+muchError(STATUS.NOT_INITIALIZED)!!!</div>\r
+<div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0for msg in msgs: print msg<=\r
+/div><div><br></div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Most of the time, u=\r
+sing the</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0:meth:`Query.count_messag=\r
+es` is therefore more</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0appropriate =\r
+(and much faster). While not guaranteeing</div>\r
+<div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0that it will return the exact same numb=\r
+er than len(),</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0in my tests it effe=\r
+ctively always did so.</div></div><div><br></div><div><br></div><div><br></=\r
+div></div>-- <br>Brian May &lt;<a href=3D"mailto:brian@microcomaustralia.co=\r
+m.au">brian@microcomaustralia.com.au</a>&gt;<br>\r
+\r
+\r
+--bcaec52c5c8dce7d8804a49fe3bc--\r