[google-appengine] Re: Get Sum from datastore
I can't comment on sharded counter, but just FYI, python has a built in method called sum that you can apply to lists or tuples, without writing your own loop. aList = [1,2,3] bTup = (1,2,3) sum(aList) or sum(bList) return 6. On Wed, Feb 11, 2009 at 7:51 PM, Barry Hunter barrybhun...@googlemail.comwrote: Search the group for 'sharded counter' - the same technique should work equally well for calculating a sum. On 11/02/2009, Neversummer wrigh...@gmail.com wrote: I want to get a total (sum) from an property on a given entity. I know that sum() is not supported. Is the best method to query for all records on the entity in question and work through a loop adding each records value (the value of the property in question) to a total variable? It's worth noting that I am brand new to google app engine and to python. Thanks for any suggestions. -- Barry - www.nearby.org.uk - www.geograph.org.uk - --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~--~~~~--~~--~--~---
[google-appengine] Re: How to get the server running
What version of python are you running? If 3.0, it might be a problem with some commands being obsolete. On Fri, Feb 6, 2009 at 2:16 PM, andre...@strombacks.se andre...@strombacks.se wrote: How do you get the server running? I'm trying to do the Hello world applicaton described in the Getting started guide and when I'm trying to start the webserver with the command: google_appengine/ dev_appserver.py helloworld/, I only get an error message saying Invalid syntax. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~--~~~~--~~--~--~---
[google-appengine] Re: BadValueError: Property fAmount must be a str or unicode instance, not a float
Thank you Alex. That took care of the issue. On Mon, Feb 2, 2009 at 8:35 PM, Alexander Kojevnikov alexan...@kojevnikov.com wrote: On Feb 3, 11:11 am, Mark mark.hac...@gmail.com wrote: My app is working fine locally on dev_appserver, but I am getting the error in the subject line after I do an appcfg update. The error occurs on a query that happens on the welcome page of the app. I think I uploaded a version that had FloatProperty in one of my databases, but I can't remember my exact order of operations that led to this error. Now, I've changed my application locally so that that field in my database is a StringProperty (I'll deal with the floatness of it later) and I get an error after I do appcfg update. You probably still have entities in the datastore with float property values. If you have few of them, go to the Data Viewer and edit the values manually. There is an option to change the type of the property values. If you have a lot of them, you will need to write a data migration script, see this article for some pointers: http://code.google.com/appengine/articles/update_schema.html I also tried using Python 3.0 (I got an error message from the appserver that said I can't use FloatProperty with 2.5), but I got an error in dev_appserver.py because execfile() is obsolete (is there a workaround for this, yet?) Python 3.0 is not supported by the App Engine, you need to use Python 2.5. Star this issue if Python 3.0 support is important for you: http://code.google.com/p/googleappengine/issues/detail?id=909 --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~--~~~~--~~--~--~---
