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Java Regex Capturing Groups
...e info on Java Pattern here.
Finally, the capturing groups are delimited by round brackets, and provide a very useful way to use back-references (amongst other things), once your Pattern is matched to the input.
In Java 6 groups can only be referenced by their order (beware of nested groups and ...
Total memory used by Python process?
...ocess = psutil.Process(os.getpid())
print(process.memory_info().rss) # in bytes
On my current Python 2.7 install with psutil 5.6.3, the last line should be
print(process.memory_info()[0])
instead (there was a change in the API).
Note: do pip install psutil if it is not installed yet.
...
Why does Double.NaN==Double.NaN return false?
...
NaN is by definition not equal to any number including NaN. This is part of the IEEE 754 standard and implemented by the CPU/FPU. It is not something the JVM has to add any logic to support.
http://en.wikipedia.org/wiki/NaN
A...
Complex CSS selector for parent of active child [duplicate]
... in the class? The example that is relevant to me relating to HTML output by a nice menu plugin for http://drupal.org . The output renders like this:
...
How to terminate the script in JavaScript?
... exit( status ) {
// http://kevin.vanzonneveld.net
// + original by: Brett Zamir (http://brettz9.blogspot.com)
// + input by: Paul
// + bugfixed by: Hyam Singer (http://www.impact-computing.com/)
// + improved by: Philip Peterson
// + bugfixed by: Brett Zamir (ht...
How do I find a “gap” in running counter with SQL?
... FROM mytable mi
WHERE mi.id = mo.id + 1
)
ORDER BY
id
LIMIT 1
In SQL Server:
SELECT TOP 1
id + 1
FROM mytable mo
WHERE NOT EXISTS
(
SELECT NULL
FROM mytable mi
WHERE mi.id = mo.id + 1
)
ORDER BY
...
Python integer division yields float
...wered Aug 15 '09 at 21:50
Jonas ByströmJonas Byström
21k2121 gold badges8383 silver badges132132 bronze badges
...
What does it mean to “program to an interface”?
...ce, but beyond that I finally understood their use as a language construct by thinking of them as a means of classifying common traits or behaviors that were exhibited by potentially many non-related classes of objects.
For example -- say you have a SIM game and have the following classes:
class H...
Differences between Proxy and Decorator Pattern
...icts the client. Decorator does not. Proxy may restrict what a client does by controlling access to functionality; or it may restrict what a client knows by performing actions that are invisible and unknown to the client. Decorator does the opposite: it enhances what its delegate does in a way that ...
Is there a CSS selector by class prefix?
...us-" occurring directly after a space character. Class names are separated by whitespace per the HTML spec, hence the significant space character. This checks any other classes after the first if multiple classes are specified, and adds a bonus of checking the first class in case the attribute value...