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In Python, what is the difference between “.append()” and “+= []”?
...l add one item to the list, while += will copy all elements of right-hand-side list into the left-hand-side list.
Update: perf analysis
Comparing bytecodes we can assume that append version wastes cycles in LOAD_ATTR + CALL_FUNCTION, and += version -- in BUILD_LIST. Apparently BUILD_LIST outweighs...
How to parse an RSS feed using JavaScript?
...btitle>
<updated>2012-06-08T06:36:47Z</updated>
<id>https://stackoverflow.com/feeds/question/10943544</id>
<creativeCommons:license>http://www.creativecommons.org/licenses/by-sa/3.0/rdf</creativeCommons:license>
<entry>
<id>...
Objective-C: Property / instance variable in category
... do exactly what you're wanting:
#import <objc/runtime.h>
static void *MyClassResultKey;
@implementation MyClass
- (NSString *)test {
NSString *result = objc_getAssociatedObject(self, &MyClassResultKey);
if (result == nil) {
// do a lot of stuff
result = ...;
objc_setAss...
How do I change the data type for a column in MySQL?
...ter table ... change ... method, for example:
mysql> create table yar (id int);
Query OK, 0 rows affected (0.01 sec)
mysql> insert into yar values(5);
Query OK, 1 row affected (0.01 sec)
mysql> alter table yar change id id varchar(255);
Query OK, 1 row affected (0.03 sec)
Records: 1 Dup...
Angular.js directive dynamic templateURL
I have a custom tag in a routeProvider template that that calls for a directive template. The version attribute will be populated by the scope which then calls for the right template.
...
How do you serialize a model instance in Django?
...
This didn't work for me. Django throws AttributeError 'tuple' object has no attribute '_meta'
– adamF
Oct 28 '15 at 16:05
...
Twig ternary operator, Shorthand if-then-else
...
{{ (ability.id in company_abilities) ? 'selected' : '' }}
The ternary operator is documented under 'other operators'
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How to overwrite styling in Twitter Bootstrap
...the stylings in Twitter Bootstrap? For instance, I am currently using a .sidebar class that has the CSS rule 'float: left;' How can I change this so that it goes to the right instead? I'm using HAML and SASS but am relatively new to web development.
...
Combining multiple commits before pushing in Git [duplicate]
...of commits and you only want to squash the last X commits, find the commit ID of the commit from which you want to start squashing and do
git rebase -i <that_commit_id>
Then proceed as described in leopd's answer, changing all the picks to squashes except the first one.
Example:
871adf OK...
add created_at and updated_at fields to mongoose schemas
...timestamps: { createdAt: 'created_at' } });
http://mongoosejs.com/docs/guide.html#timestamps
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