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How do JavaScript closures work?
...ing
In the following code, function onClick closes over variable BACKGROUND_COLOR.
const $ = document.querySelector.bind(document)
const BACKGROUND_COLOR = 'rgba(200,200,242,1)'
function onClick() {
$('body').style.background = BACKGROUND_COLOR
}
$('button').addEventListener('click', onClick...
Stop pip from failing on single package when installing with requirements.txt
...optional dependencies:
#!/bin/sh
while read dependency; do
dependency_stripped="$(echo "${dependency}" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
# Skip comments
if [[ $dependency_stripped == \#* ]]; then
continue
# Skip blank lines
elif [ -z "$dependency_str...
What does = +_ mean in JavaScript
I was wondering what the = +_ operator means in JavaScript. It looks like it does assignments.
12 Answers
...
How to find out what type of a Mat object is with Mat::type() in OpenCV
...st.
string type2str(int type) {
string r;
uchar depth = type & CV_MAT_DEPTH_MASK;
uchar chans = 1 + (type >> CV_CN_SHIFT);
switch ( depth ) {
case CV_8U: r = "8U"; break;
case CV_8S: r = "8S"; break;
case CV_16U: r = "16U"; break;
case CV_16S: r = "16S"; break;...
How to make a chain of function decorators?
... # returns "<b><i>hello world</i></b>"
print hello.__name__ # with functools.wraps() this returns "hello"
print log('hello') # returns "<b><i>hello</i></b>"
share
|...
How to write a Python module/package?
...gt;>
To group many .py files put them in a folder. Any folder with an __init__.py is considered a module by python and you can call them a package
|-HelloModule
|_ __init__.py
|_ hellomodule.py
You can go about with the import statement on your module the usual way.
For more information...
Is there a way to access method arguments in Ruby?
...meters # => [[:req, :x], [:req, :y]]
You can use the special variable __method__ to get the name of the current method. So within a method the names of its parameters can be obtained via
args = method(__method__).parameters.map { |arg| arg[1].to_s }
You could then display the name and value ...
Preserving signatures of decorated functions
...nstall decorator module:
$ pip install decorator
Adapt definition of args_as_ints():
import decorator
@decorator.decorator
def args_as_ints(f, *args, **kwargs):
args = [int(x) for x in args]
kwargs = dict((k, int(v)) for k, v in kwargs.items())
return f(*args, **kwargs)
@args_as_int...
How do I change the string representation of a Python class? [duplicate]
...
The closest equivalent to Java's toString is to implement __str__ for your class. Put this in your class definition:
def __str__(self):
return "foo"
You may also want to implement __repr__ to aid in debugging.
See here for more information:
Special Method Names - Basic Cu...
Windows下如何判断Win32 or x64？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...判断Win32 or x64？MSDN 里说，VC 有 3 个预处理常量，分别是 _WIN32，_WIN64，WIN32。这三个常量如何使用呢？看起来简单，其实是很困惑的。 在 Win3...MSDN 里说，VC 有 3 个预处理常量，分别是 _WIN32，_WIN64，WIN32。这三个常量如何使用...