大约有 47,000 项符合查询结果（耗时：0.0509秒） [XML]
How to print the contents of RDD?
...ion is to write in multiple files in HDFS, then use hdfs dfs --getmerge in order to merge the files
– Oussama
Jul 21 '15 at 16:10
...
What is scope/named_scope in rails?
... scope :fresh, -> { where('age < ?', 25) }
scope :recent, -> { order(created_at: :desc) }
end
And you call
Zombie.rotting.fresh.recent.limit(3)
It translates to the below in SQL,
select "zombies.*" from "zombies" where "zombies"."rotting" = 't' and (age<20) order by create_at de...
What does ** (double star/asterisk) and * (star/asterisk) do for parameters?
...
The output of [6] is in reverse order. name one age 27
– thanos.a
Jan 8 '17 at 21:11
61
...
How should I unit test threaded code?
...e, we want the interactions between the threads to happen in a predictable order. We don't want to externally synchronize the threads in the test, because that will mask bugs that could happen in production where the threads are not externally synchronized. That leaves the use of timing delays for...
How to iterate through SparseArray?
...
Is this guaranteed to be in key order?
– HughHughTeotl
Apr 27 '19 at 20:53
add a comment
|
...
CSS selector for first element with class
...t all .red children of .home, including the first one,
* and give them a border.
*/
.home > .red {
border: 1px solid red;
}
... then "undo" the styles for elements with the class that come after the first one, using the general sibling combinator ~ in an overriding rule:
/*
* Select al...
What is a magic number, and why is it bad? [closed]
... update.
For example, let's say you have a Page that displays the last 50 Orders in a "Your Orders" Overview Page. 50 is the Magic Number here, because it's not set through standard or convention, it's a number that you made up for reasons outlined in the spec.
Now, what you do is you have the 50 ...
What is Autoloading; How do you use spl_autoload, __autoload and spl_autoload_register?
...spl_autoload_register() with anonymous function rule just after 1st one in order o manually include missing parent / inherited classes.
– stamster
Jul 27 '17 at 21:54
...
looping through an NSMutableDictionary
...] to get an NSArray of your values. Be aware that it doesn't guarantee any order between calls.
share
|
improve this answer
|
follow
|
...
How to change the order of DataFrame columns?
... + cols[:-1]
In [13]: cols
Out[13]: ['mean', 0L, 1L, 2L, 3L, 4L]
Then reorder the dataframe like this:
In [16]: df = df[cols] # OR df = df.ix[:, cols]
In [17]: df
Out[17]:
mean 0 1 2 3 4
0 0.445543 0.445598 0.173835 0.343415 0.682252 ...