大约有 30,000 项符合查询结果（耗时：0.0363秒） [XML]
What does the constant 0.0039215689 represent?
...
0.0039215689 is approm>x m>imately equal to 1/255.
Seeing that this is OpenGL, performance is probably important. So it's probably safe to guess that this was done for performance reasons.
Multiplying by the reciprocal is faster than repeatedly divi...
How can I find out the current route in Rails?
...RI:
current_uri = request.env['PATH_INFO']
# If you are browsing http://em>x m>ample.com/my/test/path,
# then above line will yield current_uri as "/my/test/path"
To find out the route i.e. controller, action and params:
path = ActionController::Routing::Routes.recognize_path "/your/path/here/"
# ...
How to get a cross-origin resource sharing (CORS) post request working
...lan (machineA) that has two web servers. The first is the in-built one in m>X m>BMC (on port 8080) and displays our library. The second server is a CherryPy python script (port 8081) that I am using to trigger a file conversion on demand. The file conversion is triggered by a AJAm>X m> POST request from th...
Create an empty object in JavaScript with {} or new Object()?
...le.
For defining empty objects they're technically the same. The {} syntam>x m> is shorter, neater (less Java-ish), and allows you to instantly populate the object inline - like so:
var myObject = {
title: 'Frog',
url: '/img/picture.jpg',
width: 300,
height: 200
...
cd into directory without having permission
...
@user812954's answer was quite helpful, em>x m>cept I had to do this this in two steps:
sudo su
cd directory
Then, to em>x m>it out of "super user" mode, just type em>x m>it.
share
|
...
Escaping regem>x m> string
I want to use input from a user as a regem>x m> pattern for a search over some tem>x m>t. It works, but how I can handle cases where user puts characters that have meaning in regem>x m>?
...
Difference between this and self in JavaScript
...he value of self is window because JavaScript lets you access any property m>x m> of window as simply m>x m>, instead of window.m>x m>. Therefore, self is really window.self, which is different to this.
window.self === window; // true
If you're using a function that is em>x m>ecuted in the global scope and is not in...
Can em>x m>isting virtualenv be upgraded gracefully?
...
You can use the Python 2.6 virtualenv to "revirtual" the em>x m>isting directory. You will have to reinstall all the modules you installed though. I often have a virtual directory for developing a module, and virtualenv the same directory with many versions of Python, and it works just f...
RuntimeWarning: invalid value encountered in divide
... would one want to ignore a divide by zero or NaN?
– m>x m> squared
Nov 10 '17 at 14:38
7
@m>x m>squared Wh...
Flatten nested dictionaries, compressing keys
...lly the same way you would flatten a nested list, you just have to do the em>x m>tra work for iterating the dict by key/value, creating new keys for your new dictionary and creating the dictionary at final step.
import collections
def flatten(d, parent_key='', sep='_'):
items = []
for k, v in d...