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How to disallow temporaries
...
@Mikhail the order of destruction of temporary objects that are destroyed at the same points is the reverse order of their construction. The default argument that the caller passes is a temporary. If the Foo object is a temporary too, and...
How to make good reproducible pandas examples
...4, 6]], columns=['A', 'B'])
or make it "copy and pasteable" using pd.read_clipboard(sep='\s\s+'), you can format the text for Stack Overflow highlight and use Ctrl+K (or prepend four spaces to each line), or place three tildes above and below your code with your code unindented:
In [2]: df
Out[2]...
UITableViewHeaderFooterView: Unable to change background color
...FooterViewReuseIdentifier: "header")
Load with:
override func tableView(_ tableView: UITableView,
viewForHeaderInSection section: Int) -> UIView? {
if let header =
tableView.dequeueReusableHeaderFooterView(withIdentifier: "header") {
let backgroundVi...
Random row selection in Pandas dataframe
... Thanks @eumiro. I also worked out that df.ix[np.random.random_integers(0, len(df), 10)] would also work.
– John
Apr 10 '13 at 10:58
7
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How to split/partition a dataset into training and test datasets for, e.g., cross validation?
...t is not always an option, there are many cases where you have to keep the order of data inputs. And the 3rd one could very well produce the same indices for test and training (as pointed out by @ggauravr).
– pedram bashiri
Sep 17 '19 at 21:02
...
How to extract one column of a csv file
...le DOS style line breaks (CRLF i.e. "\r\n") and UTF-16 encoding (with byte order mark) to "\n" and UTF-8 (without byte order mark), respectively. Standard CSV files use CRLF as line break, see Wikipedia.
If the input may contain multiline fields, you can use the following script. Note the use of sp...
How to do URL decoding in Java?
... {
String result = java.net.URLDecoder.decode(url, StandardCharsets.UTF_8.name());
} catch (UnsupportedEncodingException e) {
// not going to happen - value came from JDK's own StandardCharsets
}
Java 10 added direct support for Charset to the API, meaning there's no need to catch Unsuppor...
What is lexical scope?
...ipt our choices for scoping are:
as-is (no scope adjustment)
lexical var _this = this; function callback(){ console.log(_this); }
bound callback.bind(this)
It's worth noting, I think, that JavaScript doesn't really have dynamic scoping. .bind adjusts the this keyword, and that's close, but not t...
Is there common street addresses database design for all addresses of the world? [closed]
...della Repubblica
89861 Tropea VV
Italy
That is rather different from the order for US addresses - on the second line.
See also the SO questions:
How many address fields would you use for a UK database?
Do you break up addresses into street / city / state / zip?
How do you deal with duplicate st...
Check if SQL Connection is Open or Closed
... as an enum and not turn it into a string.....
– marc_s
Aug 4 '11 at 15:19
4
Should've added usin...