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Why can tuples contain mutable items?
...g heterogeneous pieces of information under one roof. For example,
s = ('www.python.org', 80)
brings together a string and a number so that the host/port pair can be passed around as a socket, a composite object. Viewed in that light, it is perfectly reasonable to have mutable components.
Immuta...
How do I add a foreign key to an existing SQLite table?
...
Please check https://www.sqlite.org/lang_altertable.html#otheralter
The only schema altering commands directly supported by SQLite are the
"rename table" and "add column" commands shown above. However,
applications can make other arbitrar...
Why is it string.join(list) instead of list.join(string)?
...tring class, instead of the list class?
I agree it looks funny.
See http://www.faqs.org/docs/diveintopython/odbchelper_join.html:
Historical note. When I first learned
Python, I expected join to be a method
of a list, which would take the
delimiter as an argument. Lots of
people feel the same way, ...
Are PHP Variables passed by value or by reference?
...
http://www.php.net/manual/en/migration5.oop.php
In PHP 5 there is a new Object Model. PHP's handling of objects has been completely rewritten, allowing for better performance and more features. In previous versions of PHP, objec...
What is a word boundary in regex?
...ions for.
Anyway, this is what I found out (summarized mostly from http://www.regular-expressions.info, which is a great site): In most flavors of regex, characters that are matched by the short-hand character class \w are the characters that are treated as word characters by word boundaries. Jav...
Is there a standard sign function (signum, sgn) in C/C++?
... template <class T>
inline int sign (const T& z);
http://www.boost.org/doc/libs/1_47_0/libs/math/doc/sf_and_dist/html/math_toolkit/utils/sign_functions.html
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Is MD5 still good enough to uniquely identify files?
... such files, or be just curious - they are easily downloadable from http://www2.mat.dtu.dk/people/S.Thomsen/wangmd5/samples.html , I myself during writing this answer downloaded two samples). Another thing is, that some applications might store such duplicates for whatever reason (I'm not sure, if t...
window.onload vs document.onload
...at by the following snippet:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!--import css here-->
<!--import js scripts here-->
<scr...
How to tell if a tag failed to load
... the synchronous
blocking behavior that is the default.
More on http://www.w3.org/TR/html5/scripting-1.html#script
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How do I create an array of strings in C?
...able online for free; the most recent draft is open-std.org/jtc1/sc22/wg14/www/docs/n1225.pdf)
– Pavel Minaev
Jul 7 '09 at 21:44
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