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Forced naming of parameters in Python
...ition to other good answers for Python 2, please consider the following:
__named_only_start = object()
def info(param1,param2,param3,_p=__named_only_start,spacing=10,collapse=1):
if _p is not __named_only_start:
raise TypeError("info() takes at most 3 positional arguments")
return...
Variable interpolation in the shell
...
Use
"$filepath"_newstap.sh
or
${filepath}_newstap.sh
or
$filepath\_newstap.sh
_ is a valid character in identifiers. Dot is not, so the shell tried to interpolate $filepath_newstap.
You can use set -u to make the shell exit with an...
How can I force Powershell to return an array when a call only returns one object?
...mands in parentheses with an @ at the beginning:
$serverIps = @(gwmi Win32_NetworkAdapterConfiguration
| Where { $_.IPAddress }
| Select -Expand IPAddress
| Where { $_ -like '*.*.*.*' }
| Sort)
Specify the data type of the variable as an array:
[array]$serverIps = gwmi Win32_...
How to achieve function overloading in C?
...rt for function overloading (not operators), thanks to the addition of the _Generic keyword in C11. (supported in GCC since version 4.9)
(Overloading isn't truly "built-in" in the fashion shown in the question, but it's dead easy to implement something that works like that.)
_Generic is a compile-...
How to prevent gcc optimizing some statements in C?
...ode is portable to other compilers which don't understand GCC's #pragma or __attribute__ syntax.
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Redirecting stdout to “nothing” in python
...eference to the original sys.stdout and set it back after. For example old_stdout = sys.stdout before any of the other code, then sys.stdout = old_stdout when you are done.
– Andrew Clark
Aug 20 '14 at 21:05
...
What is the instanceof operator in JavaScript?
...there.
Every object in JavaScript has a prototype, accessible through the __proto__ property. Functions also have a prototype property, which is the initial __proto__ for any objects created by them. When a function is created, it is given a unique object for prototype. The instanceof operator uses...
TypeError: method() takes 1 positional argument but 2 were given
...
In Python, this:
my_object.method("foo")
...is syntactic sugar, which the interpreter translates behind the scenes into:
MyClass.method(my_object, "foo")
...which, as you can see, does indeed have two arguments - it's just that the first o...
How to easily map c++ enums to strings
...::strings in the map)
For extra syntactic sugar, here's how to write a map_init class. The goal is to allow
std::map<MyEnum, const char*> MyMap;
map_init(MyMap)
(eValue1, "A")
(eValue2, "B")
(eValue3, "C")
;
The function template <typename T> map_init(T&) returns a ma...
How do I choose grid and block dimensions for CUDA kernels?
...Occupancy article (currently found at nvidia.com/content/gtc-2010/pdfs/2238_gtc2010.pdf), There's a bitbucket with code here: bitbucket.org/rvuduc/volkov-gtc10
– ofer.sheffer
Apr 10 '17 at 9:04
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