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How to efficiently build a tree from a flat structure?
...t AssociatedObject { get; set; }
}
IEnumerable<Node> BuildTreeAndGetRoots(List<MyObject> actualObjects)
{
Dictionary<int, Node> lookup = new Dictionary<int, Node>();
actualObjects.ForEach(x => lookup.Add(x.ID, new Node { AssociatedObject = x }));
foreach (var ...
How do I create a parameterized SQL query? Why Should I?
...lass to start with SQL and you can build from there and add to the class.
MySQL
Public Class mysql
'Connection string for mysql
Public SQLSource As String = "Server=123.456.789.123;userid=someuser;password=somesecurepassword;database=somedefaultdatabase;"
'database connection classes...
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
...':4, 'd':5}
>>> c = {x: A.get(x, 0) + B.get(x, 0) for x in set(A).union(B)}
>>> print(c)
{'a': 1, 'c': 7, 'b': 5, 'd': 5}
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fo...
Matplotlib - Move X-Axis label downwards, but not X-Axis Ticks
...self._get_tick_bboxes(ticks_to_draw, renderer)
bbox = mtransforms.Bbox.union(bboxes)
bottom = bbox.y0
x, y = self.label.get_position()
self.label.set_position((x, bottom - self.labelpad * self.figure.dpi / 72.0))
You can set the label position independently of the ticks by using:
...
DynamicRecycler 拓展：高效动态列表 · App Inventor 2 中文网
...List, 8)
// 创建列表项视图（过程）
定义过程 CreateItem(id, root, viewType) 返回结果：
调用 DynamicLabel1.Create("label", root)
设置 DynamicLabel1.Width 为 -2 // FillParent
设置 DynamicLabel1.Padding 为 12
返回 true
// 绑定数据到视图（过程）
定...
Get root view from current activity
I know how to get the root view with View.getRootView() . I am also able to get the view from a button's onClick event where the argument is a View . But how can I get the view in an activity ?
...
How to change the order of DataFrame columns?
...
@FooBar That's not a set union it's a concatenation of two ordered lists.
– Aman
Oct 6 '16 at 22:08
3
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In the shell, what does “ 2>&1 ” mean?
.../tmp /tnt
ls: cannot access /tnt: No such file or directory
drwxrwxrwt 118 root root 196608 Jan 7 11:49 /tmp
$ ls -ld /tmp /tnt >/dev/null
ls: cannot access /tnt: No such file or directory
$ ls -ld /tmp /tnt 2>/dev/null
drwxrwxrwt 118 root root 196608 Jan 7 11:49 /tmp
(Expecting you don't...
IN vs OR in the SQL WHERE Clause
...')
WHERE foo = 'a' OR foo = 'b' OR foo = 'c'
According to the manual for MySQL if the values are constant IN sorts the list and then uses a binary search. I would imagine that OR evaluates them one by one in no particular order. So IN is faster in some circumstances.
The best way to know is to p...
How to set the context path of a web application in Tomcat 7.0
I know that I can rename my webapp (or it's WAR file) to ROOT but this is a terrible way to do it, IMHO. Now I checked out the tomcat doc & it says
...