大约有 13,700 项符合查询结果（耗时：0.0348秒） [XML]
When to use self over $this?
...on-static and static member variables:
<?php
class X {
private $non_static_member = 1;
private static $static_member = 2;
function __construct() {
echo $this->non_static_member . ' '
. self::$static_member;
}
}
new X();
?>
Here is an example of incorr...
Resumable downloads when using PHP to send the file?
...ilesize = filesize($file);
$offset = 0;
$length = $filesize;
if ( isset($_SERVER['HTTP_RANGE']) ) {
// if the HTTP_RANGE header is set we're dealing with partial content
$partialContent = true;
// find the requested range
// this might be too simplistic, apparently the client can...
How do I execute inserts and updates in an Alembic upgrade script?
... other forms.
Note that Alembic provides some basic data functions: op.bulk_insert() and op.execute(). If the operations are fairly minimal, use those. If the migration requires relationships or other complex interactions, I prefer to use the full power of models and sessions as described below.
T...
How do I do an OR filter in a Django query?
...
@alexis: you could also do Item.objects.filter(creator__in=creators), for example.
– Kevin London
Dec 9 '14 at 23:11
4
...
How to send a command to all panes in tmux?
...ction around tmux and added a custom function called send-keys-all-panes.
_tmux_send_keys_all_panes_ () {
for _pane in $(tmux list-panes -F '#P'); do
tmux send-keys -t ${_pane} "$@"
done
}
I also create a wrapper around the tmux command to simplify calling this function (for convenience)....
What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...e
### HEADER ###
LOCKFILE="/var/lock/`basename $0`"
LOCKFD=99
# PRIVATE
_lock() { flock -$1 $LOCKFD; }
_no_more_locking() { _lock u; _lock xn && rm -f $LOCKFILE; }
_prepare_locking() { eval "exec $LOCKFD>\"$LOCKFILE\""; trap _no_more_locking EXIT; }
# ON START
_prepare_l...
Navigation bar appear over the views with new iOS7 SDK
... with this if: if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_6_1)
– Aviel Gross
Oct 14 '13 at 8:40
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SQLAlchemy: print the actual query
...itting DDL. In order to access this functionality one can use the 'literal_binds' flag, passed to compile_kwargs:
from sqlalchemy.sql import table, column, select
t = table('t', column('x'))
s = select([t]).where(t.c.x == 5)
print(s.compile(compile_kwargs={"literal_binds": True}))
the above app...
Breakpoint on property change
...al object
var obj = {
someProp: 10
};
// save in another property
obj._someProp = obj.someProp;
// overwrite with accessor
Object.defineProperty(obj, 'someProp', {
get: function () {
return obj._someProp;
},
set: function (value) {
debugger; // sets breakpoint
...
Sort a list by multiple attributes?
... how, you can wrap your criteria (functions) in parenthesis:
s = sorted(my_list, key=lambda i: ( criteria_1(i), criteria_2(i) ), reverse=True)
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