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Delete files older than 15 days using PowerShell
...y empty directories that may have been left behind. My code also uses the -Force option to delete hidden and read-only files as well. Also, I chose to not use aliases as the OP is new to PowerShell and may not understand what gci, ?, %, etc. are.
$limit = (Get-Date).AddDays(-15)
$path = "C:\Some\Pa...
How do I check if a string is valid JSON in Python?
In Python, is there a way to check if a string is valid JSON before trying to parse it?
4 Answers
...
How to calculate moving average using NumPy?
...
If you just want a straightforward non-weighted moving average, you can easily implement it with np.cumsum, which may be is faster than FFT based methods:
EDIT Corrected an off-by-one wrong indexing spotted by Bean in the code. EDIT
def moving_averag...
Python ElementTree module: How to ignore the namespace of XML files to locate matching element when
...dle multiple namespaces and namespace aliases:
from io import StringIO # for Python 2 import from StringIO instead
import xml.etree.ElementTree as ET
# instead of ET.fromstring(xml)
it = ET.iterparse(StringIO(xml))
for _, el in it:
prefix, has_namespace, postfix = el.tag.partition('}')
if...
What is the instanceof operator in JavaScript?
...xplanation.
When you declare a variable you give it a specific type.
For instance:
int i;
float f;
Customer c;
The above show you some variables, namely i, f, and c. The types are integer, float and a user defined Customer data type. Types such as the above could be for any language, not ju...
Understanding scala enumerations
...e Value.
It so happens that you can write val a, b, c = foo in Scala, and for each value a, b, and c the method foo will be called again and again. Enumeration uses this trick to increment an internal counter so that each value is individual.
If you open the Scala API docs for Enumeration and clic...
How to overload __init__ method based on argument type?
...
A much neater way to get 'alternate constructors' is to use classmethods. For instance:
>>> class MyData:
... def __init__(self, data):
... "Initialize MyData from a sequence"
... self.data = data
...
... @classmethod
... def fromfilename(cls, filename):
....
detach all packages while working in R
...names(sessionInfo()$otherPkgs)), detach, character.only=TRUE, unload=TRUE, force=TRUE))
One can attempt to unload base packages via $basePkgs and also attempt using unloadNamespace(loadedNamespaces()). However these typically are fraught with errors and could break basic functionality such as causi...
Kotlin secondary constructor
...
Update: Since M11 (0.11.*) Kotlin supports secondary constructors.
For now Kotlin supports only primary constructors (secondary constructors may be supported later).
Most use cases for secondary constructors are solved by one of the techniques below:
Technique 1. (solves your case) Define ...
What is the effect of extern “C” in C++?
...ration of your function. Your function definition is contained in a binary format (that was compiled by your C++ compiler) that the client C linker will then link to using the C name.
Since C++ has overloading of function names and C does not, the C++ compiler cannot just use the function name as a ...