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What is boxing and unboxing and what are the trade offs?
...xing is the conversion of a reference type into a value type.
EX: int i = 123;
object o = i;// Boxing
int j = (int)o;// UnBoxing
Value Types are: int, char and structures, enumerations.
Reference Types are:
Classes,interfaces,arrays,strings and objects
...
Regular expression to match numbers with or without commas and decimals in text
... are embedded in other text. IMHO anything that fails to pull 1,234.56 and 1234—and only those numbers—out of abc22 1,234.56 9.9.9.9 def 1234 is a wrong answer.
First of all, if you don't need to do this all in one regex, don't. A single regex for two different number formats is hard to maintain...
How do I list all files of a directory?
...
os.listdir() will get you everything that's in a directory - files and directories.
If you want just files, you could either filter this down using os.path:
from os import listdir
from os.path import isfile, join
onlyfiles ...
How to list only top level directories in Python?
...
Filter the result using os.path.isdir() (and use os.path.join() to get the real path):
>>> [ name for name in os.listdir(thedir) if os.path.isdir(os.path.join(thedir, name)) ]
['ctypes', 'distutils', 'encodings', 'lib-tk', 'config', 'idlel...
How to revert (Roll Back) a checkin in TFS 2010
...
123
You have two options for rolling back (reverting) a changeset in Team Foundation Server 2010 V...
Getting a list of all subdirectories in the current directory
...ories, or every directory right down the tree?
Either way, you could use os.walk to do this:
os.walk(directory)
will yield a tuple for each subdirectory. Ths first entry in the 3-tuple is a directory name, so
[x[0] for x in os.walk(directory)]
should give you all of the subdirectories, recur...
Download Github pull request as unified diff
...
Somewhat related, to let git download pull request 123 and patch it into mylocalbranch locally, run:
git checkout -b mylocalbranch
git pull origin pull/921/head
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imp...
Difference between os.getenv and os.environ.get
...
One difference observed (Python27):
os.environ raises an exception if the environmental variable does not exist.
os.getenv does not raise an exception, but returns None
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Easiest way to convert int to string in C++
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@Rasoul NumberToString(23213.123) produces 23213.1 while std::to_string(23213.123) produces 23213.123000 What happens there?
– Killzone Kid
Nov 5 '17 at 23:00
...
How to detect the current OS from Gradle
... Ant's existing structure:
import org.apache.tools.ant.taskdefs.condition.Os
task checkWin() << {
if (Os.isFamily(Os.FAMILY_WINDOWS)) {
println "*** Windows "
}
}
I found this in the following Gradle branch, and it seems to work nicely. gradle/gradle-core/branches/RB-0.3/bu...