[Trac] Re: Python question
errors contains a list of tuppes, each with two elements. The first element in each tupple is a string, the field_name, and a second is the string that gets manufactured with %s is required' % field_name based on the value of field_name. I'm guessing that the next thing is that the list errors will get zipped into a dictionary. There is actually a way to make dictionaries with those kinds of expressions, but I don't remember the syntax off the top of my head. Dan Winslow wrote: Can someone explain this construct to me? errors = [(field_name, '%s is required' % field_name) for field_name in required_fields if self._is_empty(ticket[field_name])] What does 'errors' contain? I can see that it's a list of some sort...but the parenthetical grouping in the first line looks like it is some kind of initializer for field_name...so what does it return? The contents of field_name? and how does the for loop work...what's the difference between the if returning false or true? Dan Winslow Director of Information Technology, AIM INSTITUTE 1905 Harney Street, Suite 700 Omaha, NE 68102 402-345-5025 x156 dwins...@aiminstitute.org mailto:dwins...@aiminstitute.org www.aiminstitute.org http://www.aiminstitute.org -- /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ Ariel I Balter, Ph.D. Postdoc Biological Monitoring/Modeling Fundamental and Computational Sciences Directorate Pacific Northwest National Laboratory Mail: PO Box 999, MS P7-58,Richland, WA 99352 Shipping: 790 6th Street, MS P7-58, Richland, WA 99354 Tel: 509-376-7605 Cell: 509-713-0087 ariel.bal...@pnl.gov www.arielbalter.com www.pnl.gov --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Trac Users group. To post to this group, send email to trac-users@googlegroups.com To unsubscribe from this group, send email to trac-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/trac-users?hl=en -~--~~~~--~~--~--~--- begin:vcard fn:Ariel Balter, PhD n:Balter;Ariel email;internet:abal...@indiana.edu tel;home:812-332-2721 tel;cell:812-219-4558 x-mozilla-html:TRUE url:http://arielbalter.com version:2.1 end:vcard
[Trac] Re: Python question
Can someone explain this construct to me? You'd want to look for list comprehension documentation in Python The code snipped can be rewritten as: errors = [] for field_name in required_fields: if self._is_empty(ticket[field_name]): errors.append((field_name, '%s is required' % field_name)) errors = [(field_name, '%s is required' % field_name) for field_name in required_fields if self._is_empty(ticket[field_name])] --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Trac Users group. To post to this group, send email to trac-users@googlegroups.com To unsubscribe from this group, send email to trac-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/trac-users?hl=en -~--~~~~--~~--~--~---
[Trac] Re: Python question
Thanks, very much, I was having trouble finding it in Python docs. I didn't know what to call it! -Original Message- From: trac-users@googlegroups.com [mailto:trac-us...@googlegroups.com] On Behalf Of Emmanuel Blot Sent: Monday, June 08, 2009 12:04 PM To: trac-users@googlegroups.com Subject: [Trac] Re: Python question Can someone explain this construct to me? You'd want to look for list comprehension documentation in Python The code snipped can be rewritten as: errors = [] for field_name in required_fields: if self._is_empty(ticket[field_name]): errors.append((field_name, '%s is required' % field_name)) errors = [(field_name, '%s is required' % field_name) for field_name in required_fields if self._is_empty(ticket[field_name])] --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Trac Users group. To post to this group, send email to trac-users@googlegroups.com To unsubscribe from this group, send email to trac-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/trac-users?hl=en -~--~~~~--~~--~--~---
[Trac] Re: Python question
Although...this errors=[] errors.append(name,message) gives TypeError: append() takes exactly one argument (2 given -Original Message- From: trac-users@googlegroups.com [mailto:trac-us...@googlegroups.com] On Behalf Of Emmanuel Blot Sent: Monday, June 08, 2009 12:04 PM To: trac-users@googlegroups.com Subject: [Trac] Re: Python question Can someone explain this construct to me? You'd want to look for list comprehension documentation in Python The code snipped can be rewritten as: errors = [] for field_name in required_fields: if self._is_empty(ticket[field_name]): errors.append((field_name, '%s is required' % field_name)) errors = [(field_name, '%s is required' % field_name) for field_name in required_fields if self._is_empty(ticket[field_name])] --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Trac Users group. To post to this group, send email to trac-users@googlegroups.com To unsubscribe from this group, send email to trac-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/trac-users?hl=en -~--~~~~--~~--~--~---
[Trac] Re: Python question
Consider:
{{{#!python
field_names = [
'first',
'second',
'third',
]
stuff = [(field_name, 'the field name is \%s\' % field_name) for
field_name in field_names]
print(stuff)
print('\n\n')
more_stuff = dict(stuff)
for key, value in more_stuff.items():
print(key + ':\t' + value)
}}}
Dan Winslow wrote:
Can someone explain this construct to me?
errors = [(field_name, '%s is required' % field_name)
for field_name in required_fields
if self._is_empty(ticket[field_name])]
What does 'errors' contain? I can see that it's a list of some
sort...but the parenthetical grouping in the first line looks like it
is some kind of initializer for field_name...so what does it return?
The contents of field_name? and how does the for loop work...what's
the difference between the if returning false or true?
Dan Winslow
Director of Information Technology, AIM INSTITUTE
1905 Harney Street, Suite 700
Omaha, NE 68102
402-345-5025 x156
dwins...@aiminstitute.org mailto:dwins...@aiminstitute.org
www.aiminstitute.org http://www.aiminstitute.org
--
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
Ariel I Balter, Ph.D.
Postdoc
Biological Monitoring/Modeling
Fundamental and Computational Sciences Directorate
Pacific Northwest National Laboratory
Mail:
PO Box 999, MS P7-58,Richland, WA 99352
Shipping:
790 6th Street, MS P7-58, Richland, WA 99354
Tel: 509-376-7605
Cell: 509-713-0087
ariel.bal...@pnl.gov
www.arielbalter.com
www.pnl.gov
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[Trac] Re: Python question
Never mind, looks like I needed an internal paren, I guess to produce a 'tuple' errors=[] errors.append((name,message)) -Original Message- From: trac-users@googlegroups.com [mailto:trac-us...@googlegroups.com] On Behalf Of Dan Winslow Sent: Monday, June 08, 2009 12:10 PM To: trac-users@googlegroups.com Subject: [Trac] Re: Python question Although...this errors=[] errors.append(name,message) gives TypeError: append() takes exactly one argument (2 given -Original Message- From: trac-users@googlegroups.com [mailto:trac-us...@googlegroups.com] On Behalf Of Emmanuel Blot Sent: Monday, June 08, 2009 12:04 PM To: trac-users@googlegroups.com Subject: [Trac] Re: Python question Can someone explain this construct to me? You'd want to look for list comprehension documentation in Python The code snipped can be rewritten as: errors = [] for field_name in required_fields: if self._is_empty(ticket[field_name]): errors.append((field_name, '%s is required' % field_name)) errors = [(field_name, '%s is required' % field_name) for field_name in required_fields if self._is_empty(ticket[field_name])] --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Trac Users group. To post to this group, send email to trac-users@googlegroups.com To unsubscribe from this group, send email to trac-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/trac-users?hl=en -~--~~~~--~~--~--~---
[Trac] Re: Python question
Never mind, looks like I needed an internal paren, I guess to produce a 'tuple' Yeah ;-) --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Trac Users group. To post to this group, send email to trac-users@googlegroups.com To unsubscribe from this group, send email to trac-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/trac-users?hl=en -~--~~~~--~~--~--~---
