大约有 40,000 项符合查询结果（耗时：0.0520秒） [XML]
How to get the last N rows of a pandas DataFrame?
... dataframe df1 and df2 (df1 is vanila dataframe, df2 is indexed by 'STK_ID' & 'RPT_Date') :
3 Answers
...
What happens to an open file handle on Linux if the pointed file gets moved or deleted
...n still be used (This is not what some people expect). The file will not really be deleted until the last handle is closed.
If the file is replaced by a new file, it depends exactly how. If the file's contents are overwritten, the file handle will still be valid and access the new content. If the e...
Are PDO prepared statements sufficient to prevent SQL injection?
...
The short answer is NO, PDO prepares will not defend you from all possible SQL-Injection attacks. For certain obscure edge-cases.
I'm adapting this answer to talk about PDO...
The long answer isn't so easy. It's based off an attack demonstrated here.
The Attack
So, let's start off b...
How do I find out what keystore my JVM is using?
...
Your keystore will be in your JAVA_HOME---> JRE -->lib---> security--> cacerts. You need to check where your JAVA_HOME is configured, possibly one of these places,
Computer--->Advanced --> Environment variables---> JAVA_HOME
Your serv...
Determine if an object property is ko.observable
...ce) {
if ((instance === null) || (instance === undefined) || (instance.__ko_proto__ === undefined)) return false;
if (instance.__ko_proto__ === ko.dependentObservable) return true;
return ko.isComputed(instance.__ko_proto__); // Walk the prototype chain
};
UPDATE: If you are using KO 2...
How do I create an immutable Class?
I am working on creating an immutable class.
I have marked all the properties as read-only.
6 Answers
...
How do I trim leading/trailing whitespace in a standard way?
... C? I'd roll my own, but I would think this is a common problem with an equally common solution.
38 Answers
...
private[this] vs private
...rotected over public doesn't apply.
Use private[this] where performance really matters (since you'll get direct field access instead of methods this way). Otherwise, just settle on one style so people don't need to figure out why this property is private and that one is private[this].
...
Javascript Shorthand for getElementById
...
@patrick dw I like that. Especially with the wealth of valid variable names out there :)
– Fox Wilson
Jun 18 '11 at 20:56
4
...
Python os.path.join on Windows
...'c:' 'c:\\' did not work (C:\\ created two backslashes, C:\ didn't work at all) Thanks again ghostdog74, Smashery, and Roger Pate. I am in your debt :)
– Frank E.
Mar 11 '10 at 6:12
...