大约有 40,000 项符合查询结果（耗时：0.0512秒） [XML]
Ruby: How to iterate over a range, but in set increments?
...th element to the block. If the range contains numbers or strings, natural ordering is used. Otherwise step invokes succ to iterate through range elements. The following code uses class Xs, which is defined in the class-level documentation.
range = Xs.new(1)..Xs.new(10)
range.step(2) {|x| puts x}
r...
Java executors: how to be notified, without blocking, when a task completes?
...y to wait for several threads to complete execution before continuing.
In order to achieve the callback effect you're looking after, that does require a little additional extra work. Namely, handling this by yourself in a separate thread which uses the CountDownLatch and does wait on it, then goes ...
Align two inline-blocks left and right on same line
...feVh/5/. I just added the header:after part and justified the content.
In order to solve the issue of the extra space that is inserted with the after pseudo-element one can do a trick of setting the font-size to 0 for the parent element and resetting it back to say 14px for the child elements. The ...
Installing R on Mac - Warning messages: Setting LC_CTYPE failed, using “C”
...
Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
...
Is it possible to pass a flag to Gulp to have it run tasks in different ways?
...
If you've some strict (ordered!) arguments, then you can get them simply by checking process.argv.
var args = process.argv.slice(2);
if (args[0] === "--env" && args[1] === "production");
Execute it: gulp --env production
...however, I ...
Pandas get topmost n records within each group
... 2
3 7 3 1
4 8 4 1
(Keep in mind that you might need to order/sort before, depending on your data)
EDIT: As mentioned by the questioner, use df.groupby('id').head(2).reset_index(drop=True) to remove the multindex and flatten the results.
>>> df.groupby('id').head(2).res...
Anything wrong with NOT signing a .NET assembly?
... than unsigned assemblies, as they must be cryptographically verified.
In order to sign an assembly, any assemblies it depends upon must also be signed. My guess is that this contributes to your colleague's desire to sign everything -- the compiler is demanding it.
EDIT Since writing this answe...
How to create .pfx file from certificate and private key?
...
In order to get this to work on openssl 1.0.2m I had to specify -certfile intermediate.crt -certfile rootca.crt before I was prompted to protect the .pfx with a passphrase/password. I believe this is possibly because the .key di...
Why git AuthorDate is different from CommitDate?
...could happen if you make your commit and send your patch to another one in order to apply the patch in another repo: the author date will be the date of your git commit, the commit date will be set to that date when the patch is applied in the other repo.
If you send the patch to two colleagues, th...
Java compile speed vs Scala compile speed
...
You should be aware that Scala compilation takes at least an order of magnitude longer than Java to compile. The reasons for this are as follows:
Naming conventions (a file XY.scala file need not contain a class called XY and may contain multiple top-level classes). The compiler may ...