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Creating an empty list in Python
... Why does list('') give [] instead of ['']?
– Chris_Rands
Sep 20 '18 at 10:18
This is because this func make list from...
promise already under evaluation: recursive default argument reference or earlier problems?
...1, f..=f){ g.(1,T, f.=f..) }? In cases with more recursions, is it a good and safe practice adding more .? (2) if f is a non-function argument, for example g <- function(x, T, f=f){ exp(-fx/T) }* and test<- function(g.=g, T=1, f=f){ g.(1,T, f=f.) }, will using the same name for both formal a...
Remove duplicates from an array of objects in JavaScript
...alculating it on every iteration. Assign it to a variable outside the loop and pass the variable instead of the things.thing.length.
– 0v3rth3d4wn
Aug 26 '14 at 12:56
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Reverse colormap in matplotlib
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The standard colormaps also all have reversed versions. They have the same names with _r tacked on to the end. (Documentation here.)
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How to make a Python script run like a service or daemon in Linux
I have written a Python script that checks a certain e-mail address and passes new e-mails to an external program. How can I get this script to execute 24/7, such as turning it into daemon or service in Linux. Would I also need a loop that never ends in the program, or can it be done by just havin...
u'\ufeff' in Python string
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The Unicode character U+FEFF is the byte order mark, or BOM, and is used to tell the difference between big- and little-endian UTF-16 encoding. If you decode the web page using the right codec, Python will remove it for you. Examples:
#!python2
#coding: utf8
u = u'ABC'
e8 = u.encode...
Type erasure techniques
... erasure techniques in C++ are done with function pointers (for behaviour) and void* (for data). The "different" methods simply differ in the way they add semantic sugar. Virtual functions, e.g., are just semantic sugar for
struct Class {
struct vtable {
void (*dtor)(Class*);
vo...
Add line break to ::after or ::before pseudo-element content
I do not have access to the HTML or PHP for a page and can only edit via CSS. I've been doing modifications on a site and adding text via the ::after or ::before pseudo-elements and have found that escape Unicode should be used for things such as a space before or after the added content.
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How to limit depth for recursive file list?
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I use -print0 and xargs -0 a lot. Example: find . -maxdepth 1 -type d -print0 | xargs -0 ls -d
– Chris K
Mar 16 '14 at 21:53
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Is there a standard sign function (signum, sgn) in C/C++?
I want a function that returns -1 for negative numbers and +1 for positive numbers.
http://en.wikipedia.org/wiki/Sign_function
It's easy enough to write my own, but it seems like something that ought to be in a standard library somewhere.
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