🌐 Mailman 3 September 2006 - Python-list - python.org

Re: Assignment-in-conditional
by xamdam Aug. 31, 2006

Aug. 31, 2006

Thanks for the FAQ, and for the 'casm ;) What do you think about using alternative syntax (something like 'as') - max Fredrik Lundh wrote: > xamdam wrote: > > > I am not sure if this came up before, but I would love to have an > > 'assignment-in-conditional' form in python, e.g > > it's a FAQ, so it has probably come up before: > > http://pyfaq.infogami.com/why-can-t-i-use-an-assignment-in-an-expression > > </F>

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Re: Questoin about outlook calendar
by Roger Upole Aug. 31, 2006

Aug. 31, 2006

"Gallagher, Tim F (NE)" <Tim.Gallagher(a)gd-ais.com> wrote in message news:mailman.10199.1157042585.27775.python-list@python.org... "Gallagher, Tim (NE)" wrote : > import win32com.client > import time > import datetime > > outlook = win32com.client.Dispatch("Outlook.Application") > namespace = outlook.GetNamespace("MAPI") > appointments = namespace.GetDefaultFolder(9).Items > > #print appointments.count > x = 4 # This is a number for one of the calendar entries > print appointments[x] > print appointments[x].start > print appointments[x].end > print appointments[x].RecurrenceState > print appointments[x].EntryID > print appointments[x].IsRecurring > recItem = appointments[x].GetRecurrencePattern > GetRecurrencePattern is a method, so at this point recItem > is a reference to the method itself, rather than the result of calling it. > You'll need to add parens to actually call it. > > Roger > OK, I am a little lost, I do not want anyone doing my work for me but > can you give me an example. > > I am using this as an example to learn python. > > Thanks > -T recItem = appointments[x].GetRecurrencePattern() Note the parens on the end. It's very easy to forget these when translating from VB, which doesn't require them to call a method. Roger ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! >100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =---

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Re: SQLObject or SQLAlchemy?
by Jorge Godoy Aug. 31, 2006

Aug. 31, 2006

"Jorge Vargas" <jorge.vargas(a)gmail.com> writes: > for example SA wins at using an existing db > but SO wins at not worring about the db structure That's not entirely true. Some things are impossible with SQL Object alone. You have to, at least, make use of sqlbuilder. And these aren't hard things, mind you: performing joins, filtering data accordingly to N:N relationships, etc. > SO demands tables to have a primary single col int key which is manage > by the API, while SA lets you mess with it a bit more. SQL Objects allows for an str primary key as well. You're not tied to integers only. > so you could say that SO takes care about many things so you don't > have to worry about them, or other may say SO is too intrusive. As has been said, it's approach to mapping the database is a subset from SQL Alchemy. This makes it better in some cases -- simpler, at least -- and worse in other cases -- inefficient, impossible to use, etc. > In my experience SO is great for new projects and if you don't want to > mess/optimize with the actual SQL queries (which is great for an ORM because > IMO that is the main goal of ORMing) It is good for simple projects. If you need more performance then you'll have lots of troubles optimizing things with SQL Object in mind. Also it will force you to work directly on the database more often than SQL Alchemy to squeeze more performance from it. I'm converting an application from SQL Object -- that's what I've been using for a while -- to SQL Alchemy -- this will be my first production application with it -- and I'm liking the possibilities and extendability of SQL Alchemy. A lot of things that I did in the database are possible with my declarations in SQL Alchemy, so I have a map that's more "real" with regards to what's in the database. > Now if you need to mess a lot with the db (either a existing one or > need optimized queries) then SA is worth the extra effort, since > making those things on SO is going uphill. It isn't too hard to use SA for simple things. I dare to say that with ActiveMapper it is just a bit more verbose than SQL Object, but not too much. -- Jorge Godoy <jgodoy(a)gmail.com>

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Re: Coding style and else statements
by matt.newville＠gmail.com Aug. 31, 2006

Aug. 31, 2006

> To my eyes, that's less readable than, and has no benefit over, the > following: > > def foo(thing): > if thing: > result = thing+1 > else: > result = -1 > return result I wouldn't discount: def foo(thing): result = -1 if thing: result = thing+1 return result especially if "thing" is the less expected case. This puts the "more likely" result first, followed by checks that might modify that result. But, I also try to avoid adding 1 to things that I test for Truth: >>> x = 8 >>> foo(x) 9 >>> foo(x>1) 2 >>> foo(x and 1) 2 >>> foo(x or 1) 9 --Matt

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Re: Boost Python Issue
by JDJMSon Aug. 31, 2006

Aug. 31, 2006

Neal Becker wrote: > Shouldn't that be: > .def("TestFunction",&TestClass::TestFunction) > > ; Yes, you're right, but I'm still getting the error. I'm using a prebuilt python library, so later I'm going to rebuild python myself and see if that helps, as has been suggested. Thanks.

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Re: SQLObject or SQLAlchemy?
by Jorge Godoy Aug. 31, 2006

Aug. 31, 2006

"BJörn Lindqvist" <bjourne(a)gmail.com> writes: > I think this post by the author of SQLAlchemy perfectly summarizes the > differences between the two ORMs: > > http://article.gmane.org/gmane.comp.python.sqlalchemy.user/1072/ And ActiveMapper is working to some extent better than it was by the time of the post :-) -- Jorge Godoy <jgodoy(a)gmail.com>

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Trouble finding references that are keeping objects alive
by t.mitchell＠aranz.com Aug. 31, 2006

Aug. 31, 2006

Hi, I have a python gtk app that allows users to have one project open at a time. I have recently discovered that projects are not being freed when they are closed - the refcount is not hitting zero. I have used gc.get_referrers() to track down a few culprits, but I have now found that some of my dialog boxes are staying alive after being closed too (and keeping a reference to the project). e.g. gc.collect() print sys.getrefcount(self.data.project) # this function presents the dialog and loads the data idata = csvimport.ask_and_load(self.app.root, self.data.project) gc.collect() print sys.getrefcount(self.data.project) prints out: 39 40 (In this example I have cancelled the dialog and idata is None.) I have tracked down an offending tuple that has a reference to my dialog, which is a value in a large dictionary with integer keys that look like ID's. The other values in the dictionary appear to be widget connections and other stuff. Anyway, gc.get_referrers() keeps giving me lists, dictionarys and frames, which is not helping me find what code created this reference. I can't think of any other way of tracking this down apart from hacking some debug code into the python source. Does anyone have any other ideas for finding the code that created my unwanted reference before I have to dust off my C skills? Thanks Tim

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Boost Python Issue
by JDJMSon Aug. 31, 2006

Aug. 31, 2006

I was wondering if someone here could help me with a problem I'm having building Python extensions with the Boost.Python library. Basically, if I have a wrapper class with something like this: string TestFunc() { return "Hello World"; } BOOST_PYTHON_MODULE(TestClass) { def("TestFunc",TestFunc); } It compiles and I can use it without a problem. However, when I try to wrap a class with code like this: class TestClass { public: TestClass() {}; ~TestClass() {}; string TestFunction(){return "Hello World";}; }; BOOST_PYTHON_MODULE(TestClass) { class_<TestClass>("TestClass") .def("TestFunction",&TestClass.TestFunction) ; } I get the following error: vc-C++ bin\PythonTest\TestClass.pyd\vc-8_0\debug\threading-multi\TestClass.obj TestClass.cpp TestClass.cpp(27) : error C2976: 'boost::python::class_' : too few template arguments c:\Development\Boost\boost_1_33_1\boost/python/def_visitor.hpp(14) : see declaration of 'boost::python::class_' TestClass.cpp(27) : error C2440: '<function-style-cast>' : cannot convert from 'const char [10]' to 'boost::python::class_' Source or target has incomplete type I'm using Visual Studio 2005 Express Edition (I get the same error with 2003 Professional), and am using bJam to build the extension. Does anyone have any idea what's causing this?

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Re: M$ windows python libs installed in arbitrary directories forcustomized python distributions
by alf Aug. 31, 2006

Aug. 31, 2006

Robert Kern wrote: > alf wrote: > >> Fredrik Lundh wrote: >> >>> http://www.catb.org/~esr/faqs/smart-questions.html#writewell >>> >>> </F> >> >> >> and </F> means? > > > It's his signature. > The sig is delimited by '-- \n' -- alf

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