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What is the difference between old style and new style classes in Python?
...ss
Python 3 Note:
Python 3 doesn't support old style classes, so either form noted above results in a new-style class.
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Set value to null in WPF binding
...xchange.using('gps', function() { StackExchange.gps.track('embedded_signup_form.view', { location: 'question_page' }); });
$window.unbind('scroll', onScroll);
}
};
...
Understanding ibeacon distancing
...e that the term "accuracy" here is iOS speak for distance in meters. This formula isn't perfect, but it roughly approximates what iOS does.
protected static double calculateAccuracy(int txPower, double rssi) {
if (rssi == 0) {
return -1.0; // if we cannot determine accuracy, return -1.
}
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Breaking up long strings on multiple lines in Ruby without stripping newlines
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See the answer by @Jessehz. The way to have nicely formatted code with proper indenting is to put each line in quotes.
– orrd
Jun 5 '17 at 20:41
add a ...
SQLAlchemy: cascade delete
...and the one I recommend, is built into your database and usually takes the form of a constraint on the foreign key declaration. In PostgreSQL it looks like this:
CONSTRAINT child_parent_id_fkey FOREIGN KEY (parent_id)
REFERENCES parent_table(id) MATCH SIMPLE
ON DELETE CASCADE
This means that when y...
Kill child process when parent process is killed
...d processes.
public enum JobObjectInfoType
{
AssociateCompletionPortInformation = 7,
BasicLimitInformation = 2,
BasicUIRestrictions = 4,
EndOfJobTimeInformation = 6,
ExtendedLimitInformation = 9,
SecurityLimitInformation = 5,
GroupInformation = 11
}
[StructLayout(Layout...
Retain precision with double in Java
...t values are handled in Java, see the Section 4.2.3: Floating-Point Types, Formats, and Values of the Java Language Specification.
The byte, char, int, long types are fixed-point numbers, which are exact representions of numbers. Unlike fixed point numbers, floating point numbers will some times (s...
Bash: Syntax error: redirection unexpected
...installer)
However, according to this issue, it was solved:
The exec form makes it possible to avoid shell string munging, and
to RUN commands using a base image that does not contain /bin/sh.
Note
To use a different shell, other than /bin/sh, use the exec form
passing in the de...
Scalar vs. primitive data type - are they the same thing?
...enumeration types, characters, and the various representations of integers form a more general type class called scalar types. Hence, the operations you can perform on values of any scalar type are the same as those for integers.
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Why does Python pep-8 strongly recommend spaces over tabs for indentation?
...o make all code that goes in the official python distribution consistently formatted (I hope we can agree that this is universally a Good Thing™).
Since the decision between spaces and tabs for an individual programmer is a) really a matter of taste and b) easily dealt with by technical means (ed...