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What is the difference between '/' and '//' when used for division?
...floating point division, and the latter is floor division, sometimes also called integer division.
In Python 2.2 or later in the 2.x line, there is no difference for integers unless you perform a from __future__ import division, which causes Python 2.x to adopt the 3.x behavior.
Regardless of the ...
When would you use a List instead of a Dictionary?
...ionary is fast for lookup operations, because is using hash function internally. That means, all the keys must be unique in dictionary.
Consider this examples:
List<KeyValuePair<int, string>> pairs = new List<KeyValuePair<int, string>>();
pairs.Add(new KeyValuePair<int,...
Injecting $scope into an angular service function()
...table stuff), but is a Scope object. Many scope objects can be created (usually prototypically inheriting from a parent scope). The root of all scopes is the $rootScope and you can create a new child-scope using the $new() method of any scope (including the $rootScope).
The purpose of a Scope is t...
App Inventor 2 百度网盘拓展：授权、文件列表、下载、上传 · App Inventor 2 中文网
...容不同才重命名、3 覆盖。
常见问题
Q：列文件、下载一直报「身份验证失败，请重新授权」？
A：access_token 过期（约 30 天）或者填错了，按示例 1 重新授权即可。
Q：上传报「文件或目录名错误，或无权访...
Programmatically obtain the Android API level of a device?
...Build.VERSION.SDK_INT). For example you can run some piece of code which requires newer API in the following way (it will execute if the current device's API level is at least 4)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.DONUT) {
}
To obtain user visible Android Version use:
Build.VER...
How to Select Columns in Editors (Atom,Notepad++, Kate, VIM, Sublime, Textpad,etc) and IDEs (NetBean
...
And it is called "Block Selection Mode" in Kate, if you, like me, were searching for it in the Edit menu.
– ReneSac
Apr 19 '15 at 20:52
...
Select between two dates with Django
I am looking to make a query that selects between dates with Django.
4 Answers
4
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Why is the time complexity of both DFS and BFS O( V + E )
...
If in an adjacency list, each vertex is connected to all other vertices the would the complexity be equivalent to O(V+E)=O(V+V^2)=O(V^2). E=V^2 because the most number of edges = V^2.
– Max
Feb 24 '17 at 8:29
...
How do I remove version tracking from a project cloned from git?
I want to remove all version tracking from a project's directory.
9 Answers
9
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Proper use of beginBackgroundTaskWithExpirationHandler
...l need to wrap it in a background task. It's also very important that you call endBackgroundTask when you're finished - otherwise the app will be killed after its allotted time has expired.
Mine tend look something like this:
- (void) doUpdate
{
dispatch_async(dispatch_get_global_queue(DISPAT...