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How to get all subsets of a set? (powerset)
...sets).
def power_set(A):
"""A is an iterable (list, tuple, set, str, etc)
returns a set which is the power set of A."""
length = len(A)
l = [a for a in A]
ps = set()
for i in range(2 ** length):
selector = f'{i:0{length}b}'
subset = {l[j] for j, bit in enum...
Data binding to SelectedItem in a WPF Treeview
...backing store for SelectedItem. This enables animation, styling, binding, etc...
public static readonly DependencyProperty SelectedItemProperty =
DependencyProperty.RegisterAttached("SelectedItem", typeof(object), typeof(TreeViewHelper), new UIPropertyMetadata(null, SelectedItemChanged)...
What is the aspnet_client folder for under the IIS structure?
...ou're using certain features of .NET 1.0/1.1 (validation, Smart Navigation etc) you can delete it without any problems, just don't be too surprised if it comes back!
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Method names for getting data [closed]
...u are
loading from an external source,
like a file or db.
I would not use
fetch/retrieve because they are too vague and get conflated with get and there is no unambiguous semantic associated with the terms.
Example: fetch implies that some entity needs to go and get something that is remote and bri...
Use of .apply() with 'new' operator. Is this possible?
...at behave differently when called as functions, like String, Number, Date, etc.) with an array of arguments:
function construct(constructor, args) {
function F() {
return constructor.apply(this, args);
}
F.prototype = constructor.prototype;
return new F();
}
An object crea...
How enumerate all classes with custom class attribute?
...embly) {
foreach(Type type in assembly.GetTypes()) {
if (type.GetCustomAttributes(typeof(HelpAttribute), true).Length > 0) {
yield return type;
}
}
}
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Will Dispose() be called in a using statement with a null object?
...t something like:
IDisposable x = GetObject("invalid name");
try
{
// etc...
}
finally
{
if(x != null)
{
x.Dispose();
}
}
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How to use filter, map, and reduce in Python 3
...f noiters(*funcs):
if not funcs:
funcs = [map, filter, zip] # etc
from functools import reduce
globals()[reduce.__name__] = reduce
for func in funcs:
globals()[func.__name__] = lambda *ar, func = func, **kwar: list(func(*ar, **kwar))
try:
yield
finall...
Print in one line dynamically
...roach but instead of spending time calculating out the last output length, etc,
I simply use ANSI code escapes to move back to the beginning of the line and then clear that entire line before printing my current status output.
import sys
class Printer():
"""Print things to stdout on one lin...
How does a PreparedStatement avoid or prevent SQL injection?
...tion Phase:
In this phase, keywords used in query like select, from, where etc are converted into format
understandable by machine.
This is the phase where query is interpreted and corresponding action to be taken is decided.
It also has many other tasks to do, but let's not go in detail.
Query Opt...