Re: [Zope] python question
--On 1. Juli 2005 17:10:58 +0200 Jürgen Herrmann [EMAIL PROTECTED] wrote: hi all! i think there should be no functional difference in the two code snippets below, but is there any difference in performance? You could benchmark it :-) -aj pgphfg7D56dFp.pgp Description: PGP signature ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] python question
On 7/1/05, Jürgen Herrmann [EMAIL PROTECTED] wrote: i think there should be no functional difference in the two code snippets below, but is there any difference in performance? Don't know, and don't care; these are (at the Python level) functionally different. (i know, the except AttributeError could possibly mask an AttributeError in the called function...) Exactly. Shouldn't be a real issue in a released version, but better safe than sorry. 1.: hook = getattr(o, '_before_transaction_commit', None) if hook: hook() Better yet: hook = getattr(o, '_before_transaction_commit', None) if hook is not None: hook() -Fred -- Fred L. Drake, Jr.fdrake at gmail.com Zope Corporation ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] python question
sort() on a sequence does not return anything. It operates on the
[mutable] sequence in place.
You probably want to push this bit into a python script where you have
more elbow room, and do this:
files.sort(etc,etc)
return files[0]
hth,
Jim
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Kate Legere
Sent: Tuesday, May 31, 2005 3:35 PM
To: Zope
Subject: [Zope] python question
I may be asking this in the wrong place but I have a tal page
where I want to use python to display only the most recent
addition to a folder of files.
I can sort the folder and return all the files easily with:
return sequence.sort(files, (('bobobase_modification_time', 'cmp',
'desc'),))
How do I return just the most recent one? (I tried sorting
and then using return max(files) but that doesn't give me all
the properties and I need them for display)
Kate
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Re: [Zope] python question
Kate Legere wrote:
I may be asking this in the wrong place but I have a tal page where I want
to use python to display only the most recent addition to a folder of files.
I can sort the folder and return all the files easily with:
return sequence.sort(files, (('bobobase_modification_time', 'cmp',
'desc'),))
How do I return just the most recent one? (I tried sorting and then using
return max(files) but that doesn't give me all the properties and I need
them for display)
If it's sorted, you can use a Python slice::
return sequence.sort(files, (('bobobase_modification_time',
'cmp', 'desc'),))[0]
The trick is the last three characters. See
http://docs.python.org/tut/node5.html
--jcc
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Building Websites with Plone
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RE: [Zope] python question
Thanks - turns out the real error was in the file dealing with it - all
fixed now.
Thanks for the help.
Kate
-Original Message-
From: Jim Abramson [mailto:[EMAIL PROTECTED]
Sent: Tuesday, May 31, 2005 2:38 PM
To: Kate Legere; Zope
Subject: RE: [Zope] python question
sort() on a sequence does not return anything. It operates on the
[mutable] sequence in place.
You probably want to push this bit into a python script where you have
more elbow room, and do this:
files.sort(etc,etc)
return files[0]
hth,
Jim
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Kate Legere
Sent: Tuesday, May 31, 2005 3:35 PM
To: Zope
Subject: [Zope] python question
I may be asking this in the wrong place but I have a tal page
where I want to use python to display only the most recent
addition to a folder of files.
I can sort the folder and return all the files easily with:
return sequence.sort(files, (('bobobase_modification_time', 'cmp',
'desc'),))
How do I return just the most recent one? (I tried sorting
and then using return max(files) but that doesn't give me all
the properties and I need them for display)
Kate
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Re: [Zope] python question
Am Dienstag, den 31.05.2005, 15:34 -0400 schrieb Kate Legere:
I may be asking this in the wrong place but I have a tal page where I want
to use python to display only the most recent addition to a folder of files.
I can sort the folder and return all the files easily with:
return sequence.sort(files, (('bobobase_modification_time', 'cmp',
'desc'),))
How do I return just the most recent one? (I tried sorting and then using
return max(files) but that doesn't give me all the properties and I need
them for display)
Use:
return sequence.sort(files, (('bobobase_modification_time',
'cmp','desc'),))[:3]
[:3] is a slice operator which returns
item0...item2
since you sorted descenting by modification time, the
first 3 objects should be the most recent 3.
Regards
Tino
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RE: [Zope] python question
Am Dienstag, den 31.05.2005, 15:38 -0400 schrieb Jim Abramson: sort() on a sequence does not return anything. It operates on the [mutable] sequence in place. sequence is a module in Zope. So she indeed was right. ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] python question
blast! i'll keep my mouth shut til I get the library memorized. Jim -Original Message- From: Tino Wildenhain [mailto:[EMAIL PROTECTED] Sent: Tuesday, May 31, 2005 4:06 PM To: Jim Abramson Cc: Kate Legere; Zope Subject: RE: [Zope] python question Am Dienstag, den 31.05.2005, 15:38 -0400 schrieb Jim Abramson: sort() on a sequence does not return anything. It operates on the [mutable] sequence in place. sequence is a module in Zope. So she indeed was right. ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
