大约有 41,400 项符合查询结果（耗时：0.0256秒） [XML]
How to split a sequence into two pieces by predicate?
...
By using partition method:
scala> List(1,2,3,4).partition(x => x % 2 == 0)
res0: (List[Int], List[Int]) = (List(2, 4),List(1, 3))
share
|
improve this answer
...
Convert bytes to a string
...
3949
You need to decode the bytes object to produce a string:
>>> b"abcde"
b'abcde'
# u...
MAMP Pro 3.05 on Mavericks updated to Yosemite - Apache does not start
I have been running MAMP Pro 3.05 successfully in Yosemite up to DP4 on a partition that was a clean install of Yosemite.
1...
String formatting named parameters?
...
In Python 2.6+ and Python 3, you might choose to use the newer string formatting method.
print('<a href="{0}">{0}</a>'.format(my_url))
which saves you from repeating the argument, or
print('<a href="{url}">{url}</a>'.format...
How to initialize all members of an array to the same value in Swift?
...ue like this:
With old Swift version:
var threeDoubles = [Double](count: 3, repeatedValue: 0.0)
Since Swift 3.0:
var threeDoubles = [Double](repeating: 0.0, count: 3)
which would give:
[0.0, 0.0, 0.0]
share
...
Integer division with remainder in JavaScript?
...
1309
For some number y and some divisor x compute the quotient (quotient) and remainder (remainder)...
If list index exists, do X
...|
edited Dec 12 '16 at 0:03
Dimitris Fasarakis Hilliard
108k2424 gold badges208208 silver badges212212 bronze badges
...
Rails - controller action name to string
...
339
Rails 2.X: @controller.action_name
Rails 3.1.X: controller.action_name, action_name
Rails 4....
Impossible to Install PG gem on my mac with Mavericks
...
253
If you want to avoid using MacPorts, you can download the Postgres App and place it into the App...
How to remove an element from a list by index
...y the index of the element you want to delete:
>>> a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> del a[-1]
>>> a
[0, 1, 2, 3, 4, 5, 6, 7, 8]
Also supports slices:
>>> del a[2:4]
>>> a
[0, 1, 4, 5, 6, 7, 8, 9]
Here is the section from the tutorial.
...