大约有 40,000 项符合查询结果（耗时：0.0555秒） [XML]
Rotating a two-dimensional array in Python
...iginal = [[1, 2],
[3, 4]]
Lets break it down step by step:
>>> original[::-1] # elements of original are reversed
[[3, 4], [1, 2]]
This list is passed into zip() using argument unpacking, so the zip call ends up being the equivalent of this:
zip([3, 4],
[1, 2])
# ...
Shared-memory objects in multiprocessing
...f.lock.acquire()
# double size if necessary
if (self.cnt >= len(self.shared_arrays)):
self.shared_arrays = self.shared_arrays + [None] * len(self.shared_arrays)
# next handle
self.__getNextFreeHdl()
# create array in shared memory seg...
Why are there no ++ and -- operators in Python?
...much as in other languages. You don't write things like for(int i = 0; i < 10; ++i) in Python very often; instead you do things like for i in range(0, 10).
Since it's not needed nearly as often, there's much less reason to give it its own special syntax; when you do need to increment, += is usu...
How to show SQL queries run in the Rails console?
...3+ you can use ActiveRecord::Relation’s to_sql method:
User.where(:id => 3).to_sql
#=> "SELECT \"users\".* FROM \"users\" WHERE \"users\".\"id\" = 3"
share
|
improve this answer
...
How does Activity.finish() work in Android?
...
If there are two activities A and B. And your flow is going from A > B; and B=A calls finish().
Then,
The method where you called finish() from will execute as Mark mentioned. And flow of callbacks will be as followed -
onPause() of activity A
onRestart() > onStart() > onResume...
OAuth 2.0: Benefits and use cases — why?
...on behalf of the user by passing the access token.
Each exchange (client->server, server->content provider) includes validation of a shared secret, but since OAuth 1 can run over an unencrypted connection, each validation cannot pass the secret over the wire.
That's done, as you've noted, wi...
Visual studio long compilation when replacing int with double
My copy of VS2013 Ultimate compiles this code for 60+ seconds:
2 Answers
2
...
Get epoch for a specific date using Javascript
...d, which is implementation dependant in ECMA-262 3rd edition and, as a result, notoriously inflexible in IE.
– Andy E
Jul 30 '10 at 7:50
...
Base64 Decoding in iOS 7+
...decodedData, encoding: .utf8) {
print(decodedString) // foo
}
Swift < 3
let plainString = "foo"
Encoding
let plainData = plainString.dataUsingEncoding(NSUTF8StringEncoding)
let base64String = plainData?.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))
print(base6...
Invoke a callback at the end of a transition
...r.
The donut example that ships with D3 also uses this to chain together multiple transitions.
Here's my own demo that changes the style of elements at the start and end of the transition.
From the documentation for transition.each([type],listener):
If type is specified, adds a listener for tr...