大约有 2,326 项符合查询结果（耗时：0.0150秒） [XML]
Ruby: Can I write multi-line string with no concatenation?
...re's a version using funny HEREDOC syntax (via this link):
p <<END_SQL.gsub(/\s+/, " ").strip
SELECT * FROM users
ORDER BY users.id DESC
END_SQL
# >> "SELECT * FROM users ORDER BY users.id DESC"
The latter would mostly be for situations that required more flexibility in t...
What is the difference between the add and offer methods in a Queue in Java?
Take the PriorityQueue for example http://java.sun.com/j2se/1.5.0/docs/api/java/util/PriorityQueue.html#offer(E)
8 Answe...
Good examples of Not a Functor/Functor/Applicative/Monad?
...the usual semantics, which tolerates exactly one kind of undefined, you're quite right. There are other semanticses, of course. Void does not restrict to a submonoid in the total fragment. Nor is it a monoid in a semantics which distinguishes modes of failure. When I have a moment with easier than ...
How should I log while using multiprocessing in Python?
... @BrandonRhodes - As I said, non-intrusively. Using multiprocessing.Queue will not be simpler if there is a lot of code to rewire to use multiprocessing.Queue, and/or if performance is an issue
– vladr
Oct 9 '13 at 17:07
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How to create a bash script to check the SSH connection?
...
You can check this with the return-value ssh gives you:
$ ssh -q user@downhost exit
$ echo $?
255
$ ssh -q user@uphost exit
$ echo $?
0
EDIT: Another approach would be to use nmap (you won't need to have keys or login-stuff):
$ a=`nmap uphost -PN -p ssh | grep open`
$ b=`nmap downhos...
How to remove an item for a OR'd enum?
...lue 'X') and the complement of one or more set bits (let's call those bits Q and their complement ~Q), the statement X & ~Q clears any bits that were set in Q from X and returns the result.
So to remove or clear the BLUE bits, you use the following statement:
colorsWithoutBlue = colors & ~...
How to find all combinations of coins when given some dollar value
...
Good answer, but minor quibbles: note that (1) This gives the number of ways, while for some reason the question asks for the actual set of all ways. Of course, there can be no way of finding the set in polynomial time, since the output itself has ...
read subprocess stdout line by line
...e: according to the documentation the solution with an iterator should be equivalent to using readline(), except for the read-ahead buffer, but (or exactly because of this) the proposed change did produce different results for me (Python 2.5 on Windows XP).
...
How to return multiple objects from a Java method?
...
package util;
public class Pair<A,B> {
public static <P, Q> Pair<P, Q> makePair(P p, Q q) {
return new Pair<P, Q>(p, q);
}
public final A a;
public final B b;
public Pair(A a, B b) {
this.a = a;
this.b = b;
}
@Overri...
Rotating and spacing axis labels in ggplot2
...
Change the last line to
q + theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))
By default, the axes are aligned at the center of the text, even when rotated. When you rotate +/- 90 degrees, you usually want it to be aligned at th...