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Two way/reverse map [duplicate]
...code in Python 3 I get a warning : Unexpected type(s): (Generator[Iterator[Union[str, Any]], Any, None]) Possible types: (Mapping) (Iterable[Tuple[Any, Any]]). Any ideas how to get rid of the warning?
– Kerwin Sneijders
Jan 8 at 0:38
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Multiple INSERT statements vs. single INSERT with multiple VALUES
...t
One place where this information is leveraged is shown by @Lieven here
SELECT *
FROM (VALUES ('Lieven1', 1),
('Lieven2', 2),
('Lieven3', 3))Test (name, ID)
ORDER BY name, 1/ (ID - ID)
Because at compile time it can determine that the Name column has no duplicates it...
Python recursive folder read
...
Make sure you understand the three return values of os.walk:
for root, subdirs, files in os.walk(rootdir):
has the following meaning:
root: Current path which is "walked through"
subdirs: Files in root of type directory
files: Files in root (not in subdirs) of type other than directory...
How to check if all of the following items are in a list?
...readable, but it may be over-kill. Sets are particularly useful to compute union/intersection/differences between collections, but it may not be the best option in this situation ...
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Ukkonen's suffix tree algorithm in plain English
...ts.
What we are building, is basically like a search trie. So there
is a root node, edges going out of it leading to new nodes, and
further edges going out of those, and so forth
But: Unlike in a search trie, the edge labels are not single
characters. Instead, each edge is labeled using a pair of ...
Get Root Directory Path of a PHP project
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this is just awesome, I tried $_SERVER['DOCUMENT_ROOT'], dirname(), $_SERVER['SCRIPT_NAME'] etc. but this worked excellently!
– webblover
Nov 26 '14 at 16:40
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How do I handle the window close event in Tkinter?
... a concrete example:
import tkinter as tk
from tkinter import messagebox
root = tk.Tk()
def on_closing():
if messagebox.askokcancel("Quit", "Do you want to quit?"):
root.destroy()
root.protocol("WM_DELETE_WINDOW", on_closing)
root.mainloop()
...
Exclude folder from search but not from the project list
... apply.
Then when you search using CTRL+SHIFT+F, under Options > Scope select Custom and choose the scope you just created (thanks commenters).
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Why do we check up to the square root of a prime number to determine if it is prime?
... not, why do we have to test whether it is divisible only up to the square root of that number?
13 Answers
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How important is the order of columns in indexes?
I've heard that you should put columns that will be the most selective at the beginning of the index declaration. Example:
...