Yes, I think also lambda can be good one. Though lambda reduces an effort to type a predefined function, functools.partial is a bit familiar to me.
Best regards, Tate -----Original Message----- From: "Jackson, Cameron" <cameron.jack...@thalesgroup.com.au> Sender: sqlalchemy@googlegroups.com Date: Fri, 2 Dec 2011 12:44:26 To: sqlalchemy@googlegroups.com<sqlalchemy@googlegroups.com> Reply-To: sqlalchemy@googlegroups.com Subject: RE: [sqlalchemy] Passing additional arguments to event listeners ? Not sure if this helps or not, but how about using a lambda that that calls your function with the arguments you want? This is the solution I've been using for passing arguments to wxPython event handlers. This tutorial might help: http://wiki.wxpython.org/Passing%20Arguments%20to%20Callbacks -----Original Message----- From: sqlalchemy@googlegroups.com [mailto:sqlalchemy@googlegroups.com] On Behalf Of Tate Kim Sent: Friday, 2 December 2011 12:33 PM To: sqlalchemy@googlegroups.com Subject: Re: [sqlalchemy] Passing additional arguments to event listeners ? How about functools.partial ? As far as I know, functools.partial will simply do this. Usually, I import this when I need to make an argument-less function equip extra arguments. Best regards, Tate -----Original Message----- From: Michael Bayer <mike...@zzzcomputing.com> Sender: sqlalchemy@googlegroups.com Date: Thu, 1 Dec 2011 19:52:15 To: <sqlalchemy@googlegroups.com> Reply-To: sqlalchemy@googlegroups.com Subject: Re: [sqlalchemy] Passing additional arguments to event listeners ? On Dec 1, 2011, at 7:24 PM, Łukasz Czuja wrote: > Hi, > > I do not see anywhere in the docs a way to pass custom attributes to > event listeners: > > event.listen(cls, 'before_insert', before_insert_listener, arg1, arg2, > kwarg1 = 'value', kwarg2 = 'value2') > > so that the before_insert_listener can have mixed signature: > > def before_insert_listener(mapper, connection, target, arg1, *args, > **kwargs): > > the only other solution would be to store extra processing information > on the 'target' itself. > > Should be reasonable if there is not another way to pass around > arguments. Should I open a ticket then? this kind of pollutes the API with kwargs that might be needed for the listen() function itself someday, these are external use cases that are easily handled in Python: def before_insert_listener(arg1, arg2, k1='value', k2='value'): def before_insert(mapper, conn, target): ... body return before_insert event.listen(cls, 'before_insert', before_insert_listener(arg1, arg2, k1='x', k2='y')) -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en. ------------------------------------------------------------------------- DISCLAIMER: This e-mail transmission and any documents, files and previous e-mail messages attached to it are private and confidential. They may contain proprietary or copyright material or information that is subject to legal professional privilege. They are for the use of the intended recipient only. Any unauthorised viewing, use, disclosure, copying, alteration, storage or distribution of, or reliance on, this message is strictly prohibited. No part may be reproduced, adapted or transmitted without the written permission of the owner. If you have received this transmission in error, or are not an authorised recipient, please immediately notify the sender by return email, delete this message and all copies from your e-mail system, and destroy any printed copies. Receipt by anyone other than the intended recipient should not be deemed a waiver of any privilege or protection. Thales Australia does not warrant or represent that this e-mail or any documents, files and previous e-mail messages attached are error or virus free. ------------------------------------------------------------------------- -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
