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What is the difference between Cygwin and MinGW?
...oes this mean I need to download the mingw libraries from mingw's official site in order to compile to a mingw target from a cygwin host? Or can these libraries be downloaded from Cygwin's package system?
– CMCDragonkai
Feb 20 '15 at 7:02
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Why it's not possible to use regex to parse HTML/XML: a formal explanation in layman's terms
... or bonbon. Matching of recursive/balanced structures make these even more fun.
Wikipedia puts this nicely, in a quote by Larry Wall:
'Regular expressions' [...] are only marginally related to real regular expressions. Nevertheless, the term has grown with the capabilities of our pattern matchi...
What is the difference between cout, cerr, clog of iostream header in c++? When to use which one?
...::clog.rdbuf(clogbuf);
}
int main()
{
test();
std::cout << "123";
}
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How to get the anchor from the URL using jQuery?
...the easiest method is:
var url = 'https://www.stackoverflow.com/questions/123/abc#10076097';
var hash = url.split('#').pop();
If you're using jQuery, use this:
var hash = $(location).attr('hash');
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Adding new column to existing DataFrame in Python pandas
...)
As per this example (which also includes the source code of the assign function), you can also include more than one column:
df = pd.DataFrame({'a': [1, 2], 'b': [3, 4]})
>>> df.assign(mean_a=df.a.mean(), mean_b=df.b.mean())
a b mean_a mean_b
0 1 3 1.5 3.5
1 2 4 1...
Null vs. False vs. 0 in PHP
...ill get inequality.
So why are they useful ?
Well, look at the strrpos() function. It returns False if it did not found anything, but 0 if it has found something at the beginning of the string !
<?php
// pitfall :
if (strrpos("Hello World", "Hello")) {
// never exectuted
}
// smart move ...
Does the 'mutable' keyword have any purpose other than allowing the variable to be modified by a con
...cally it lets you bypass constness on arbitrary members at a specific call site, while mutable let's you remove const on a specific member at all call sites. The latter is usually what you want for the typical use (caching, stats), but sometimes the const_cast fits the pattern.
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Insert, on duplicate update in PostgreSQL?
...RT, as appropriate:
CREATE TABLE db (a INT PRIMARY KEY, b TEXT);
CREATE FUNCTION merge_db(key INT, data TEXT) RETURNS VOID AS
$$
BEGIN
LOOP
-- first try to update the key
-- note that "a" must be unique
UPDATE db SET b = data WHERE a = key;
IF found THEN
...
Including non-Python files with setup.py
... these files to be copied at install time to the package’s folder inside site-packages, you’ll need to supply include_package_data=True to the setup() function. See Adding Non-Code Files for more information.
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Insert a line break in mailto body
...ple that land on this page as it is to help them. It is not useful by this site's standards, and so it has been voted accordingly
– UnrealEagle
Oct 3 '19 at 8:42
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