大约有 41,000 项符合查询结果（耗时：0.0508秒） [XML]
How do I turn on SQL debug logging for ActiveRecord in RSpec tests?
I have some RSpec tests for my models and I would like to turn on SQL ActiveRecord logging just like I see in the Rails server mode. How to do that?
...
Is it possible to use argsort in descending order?
...ay, the lowest elements become the highest elements and vice-versa. Therefore, the indices of the n highest elements are:
(-avgDists).argsort()[:n]
Another way to reason about this, as mentioned in the comments, is to observe that the big elements are coming last in the argsort. So, you can rea...
Url decode UTF-8 in Python
...data to UTF-8 bytes and then to text, transparently:
from urllib.parse import unquote
url = unquote(url)
Demo:
>>> from urllib.parse import unquote
>>> url = 'example.com?title=%D0%BF%D1%80%D0%B0%D0%B2%D0%BE%D0%B2%D0%B0%D1%8F+%D0%B7%D0%B0%D1%89%D0%B8%D1%82%D0%B0'
>>> ...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
Is calculating an MD5 hash less CPU intensive than SHA-1 or SHA-2 on "standard" laptop x86 hardware? I'm interested in general information, not specific to a certain chip.
...
Difference between DOM parentNode and parentElement
...t is new to Firefox 9 and to DOM4, but it has been present in all other major browsers for ages.
In most cases, it is the same as parentNode. The only difference comes when a node's parentNode is not an element. If so, parentElement is null.
As an example:
document.body.parentNode; // the <htm...
Multi-line commands in GHCi
...
Most of the time, you can rely on type inference to work out a signature for you. In your example, the following is sufficient:
Prelude> let addTwo x y = x + y
If you really want a definition with a type signature, or your definition spans over multiple lines, you can do ...
How to write multiple line property value using PropertiesConfiguration?
...ies on backslash + end-of-line. I just found it documented in:
http://docs.oracle.com/javase/6/docs/api/java/util/Properties.html
primes = 2,\
3,\
5,\
7,\
11
share
|
improve this a...
How do you express binary literals in Python?
...
For reference—future Python possibilities:
Starting with Python 2.6 you can express binary literals using the prefix 0b or 0B:
>>> 0b101111
47
You can also use the new bin function to get the binary representatio...
How to ignore xargs commands if stdin input is empty?
...
For GNU xargs, you can use the -r or --no-run-if-empty option:
--no-run-if-empty
-r If the standard input does not contain any nonblanks, do not run the command. Normally, the command is run once even if the...
How to respond with HTTP 400 error in a Spring MVC @ResponseBody method returning String?
I'm using Spring MVC for a simple JSON API, with @ResponseBody based approach like the following. (I already have a service layer producing JSON directly.)
...