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The tilde operator in Python
...se complement operator in python which essentially calculates -x - 1
So a table would look like
i ~i
0 -1
1 -2
2 -3
3 -4
4 -5
5 -6
So for i = 0 it would compare s[0] with s[len(s) - 1], for i = 1, s[1] with s[len(s) - 2].
As for your other question, this can be useful for a range of ...
Format date and time in a Windows batch script
...IC Path Win32_LocalTime Get Day^,Hour^,Minute^,Month^,Second^,Year /Format:table') DO (
IF "%%~L"=="" goto s_done
Set _yyyy=%%L
Set _mm=00%%J
Set _dd=00%%G
Set _hour=00%%H
SET _minute=00%%I
SET _second=00%%K
)
:s_done
:: Pad digits with leading zeros
Set...
How to check Oracle database for long running queries
... object_name
/
This is a good one for finding long operations (e.g. full table scans). If it is because of lots of short operations, nothing will show up.
COLUMN percent FORMAT 999.99
SELECT sid, to_char(start_time,'hh24:mi:ss') stime,
message,( sofar/totalwork)* 100 percent
FROM v$session_l...
How to delete multiple values from a vector?
...
@docendodiscimus: fsetdiff of data.table package has an all flag (default F) that allows to keep duplicates in the input vector.
– Juergen
Jan 8 '18 at 9:45
...
Laravel Check If Related Model Exists
...ning: count(): Parameter must be an array or an object that implements Countable
– CodeGodie
Jun 26 '18 at 22:58
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How to find if a given key exists in a C++ std::map
...sume so. For a language-agnostic discussion of your question, see Can hash tables really be O(1)?.
– DavidRR
May 14 '17 at 15:10
...
HTML5 best practices; section/header/aside/article elements
...TML5 outline algorithm for the purpose of creating an outline—or—table of contents (TOC). The outline is not generally visible (these days), but authors should use html in such a way that the resulting outline reflects their intentions.
You can create sections with exactly these elements ...
Android SQLite: nullColumnHack parameter in insert/replace methods
...
Let's suppose you have a table named foo where all columns either allow NULL values or have defaults.
In some SQL implementations, this would be valid SQL:
INSERT INTO foo;
That's not valid in SQLite. You have to have at least one column specifie...
How can I connect to MySQL in Python 3 on Windows?
...like mysqlclient is in debian testing as python3-mysqldb, but it's not in stable. So it will be in the next version.
– Collin Anderson
Mar 31 '17 at 15:57
...
CSS Child vs Descendant selectors
...will match the following example, but div > p will not.
<div><table><tr><td><p> <!...
The first one is called descendant selector and the second one is called child selector.
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