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How do I get a list of column names from a psycopg2 cursor?
...rk Lutz:
curs.execute("Select * FROM people LIMIT 0")
colnames = [desc[0] for desc in curs.description]
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Python decorators in classes
...on an instance and could do anything to the instance variables it wanted before and after ( or even whether or not ) it called "bar". There is no such thing as instance variables when declaring the class. Did you want to do something to the class from within the decorator? I do not think that is ...
Get last result in interactive Python shell
... It only works in the interactive shell, though. Don't rely on it for scripts.
– John Fouhy
Oct 14 '08 at 4:54
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Django ManyToMany filter()
... style filters in the many-to-many and many-to-one tests. Here is syntax for your specific problem:
users_in_1zone = User.objects.filter(zones__id=<id1>)
# same thing but using in
users_in_1zone = User.objects.filter(zones__in=[<id1>])
# filtering on a few zones, by id
users_in_zones...
Getters \ setters for dummies
...eir silverlight run everywhere, so I have to program everything twice, one for SL and one for rest of the world :)
– Akash Kava
Mar 22 '11 at 16:19
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In-memory size of a Python structure
Is there a reference for the memory size of Python data stucture on 32- and 64-bit platforms?
7 Answers
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Django select only rows with duplicate field values
... .filter(id__count__gt=1)
Literal.objects.filter(name__in=[item['name'] for item in dupes])
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Java: parse int value from a char
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@KevinVanRyckegem thank you! I was looking for why - '0' worked...I thought it was some deep magic in how Java interpreted chars or whatever...this truly was a case of me over complicating something...
– scoots
May 21 '18 at 20:3...
iOS开发调试技巧总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...、详细时间、行号。
#import"ViewController.h"
#defineNSLog(format,...)do{\
fprintf(stderr,"%s\n",\
[[[NSStringstringWithUTF8String:__FILE__]lastPathComponent]UTF8String],\
__LINE__,__func__);\
(NSLog)((format),##__VA_ARGS__);\
fprintf(stderr,"-------\n");\
}while(0)
@interface...
How do I create an average from a Ruby array?
...| sum + el }.to_f / arr.size
=> 6.5
Note the .to_f, which you'll want for avoiding any problems from integer division. You can also do:
arr = [5, 6, 7, 8]
arr.inject(0.0) { |sum, el| sum + el } / arr.size
=> 6.5
You can define it as part of Array as another commenter has suggested, but yo...