大约有 5,000 项符合查询结果（耗时：0.0274秒） [XML]
Getting indices of True values in a boolean list
...:
>>> from itertools import compress
>>> list(compress(xrange(len(t)), t))
[4, 5, 7]
>>> t = t*1000
>>> %timeit [i for i, x in enumerate(t) if x]
100 loops, best of 3: 2.55 ms per loop
>>> %timeit list(compress(xrange(len(t)), t))
1000 loops, best of 3: ...
SQLiteDatabase.query method
...can do
int idx = c.getColumnIndex("max");
is equivalent to the following raw query
String queryString =
"SELECT column1, (SELECT max(column1) FROM table1) AS max FROM table1 " +
"WHERE column1 = ? OR column1 = ? ORDER BY column1";
sqLiteDatabase.rawQuery(queryString, whereArgs);
By us...
Array slicing in Ruby: explanation for illogical behaviour (taken from Rubykoans.com)
... nil
* array[start, length] -> an_array or nil
* array[range] -> an_array or nil
* array.slice(index) -> obj or nil
* array.slice(start, length) -> an_array or nil
* array.slice(range) -> an_array or nil
which su...
Generate a random number in the range 1 - 10
...
The docs say "random value in the range 0.0 <= x < 1.0", so there is at least a theoretical chance of ceil(random() * 10) resulting in 0 — I would stick to floor.
– user6854914
Jan 15 '18 at 8:48
...
Ruby, remove last N characters from a string?
...l real
chomp 0.949823 0.001025 0.950848 ( 0.951941)
range 1.874237 0.001472 1.875709 ( 1.876820)
delete_suffix 0.721699 0.000945 0.722644 ( 0.723410)
delete_suffix! 0.650042 0.000714 0.650756 ( 0.651332)
I hope this is useful - note the method ...
One-line list comprehension: if-else variants
...I've got a list comprehension that produces list of odd numbers of a given range:
5 Answers
...
Difference between List, List, List, List, and List
...ould then get a compiler warning (it would warn and say that you are using raw types), and you never want to compile your code with warnings.
– Kaj
Jun 3 '11 at 21:42
...
angular.element vs document.getElementById or jQuery selector with spin (busy) control
...element argument in a directives compile or link function). They are never raw DOM references.
In case you do wonder why to use document.querySelector(), please read this answer.
share
|
improve th...
PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
... version of Erik's answer).
function crypto_rand_secure($min, $max)
{
$range = $max - $min;
if ($range < 1) return $min; // not so random...
$log = ceil(log($range, 2));
$bytes = (int) ($log / 8) + 1; // length in bytes
$bits = (int) $log + 1; // length in bits
$filter = (...
List of special characters for SQL LIKE clause
...an (Dean, Sean, and so on).
[ ] Any single character within the specified range ([a-f]) or set ([abcdef]).
WHERE au_lname LIKE '[C-P]arsen' finds author last names ending with arsen and starting with any single character between C and P, for example Carsen, Larsen, Karsen, and so on. In range searc...