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Best way to test for a variable's existence in PHP; isset() is clearly broken
...ng them as though they were. However, since they can be iterated, counted, etc, a missing value is not the same as one whose value is null.
The answer in this case, is to use array_key_exists() instead of isset().
Since this is takes the array to check as a function argument, PHP will still raise ...
Real world example about how to use property feature in python?
...tein_folding_angle(self):
# number crunching, remote server calls, etc
# all results in an angle set in 'some_angle'
# It could also reference a cache, remote or otherwise,
# that holds the latest value for this angle
return some_angle
>>> f = PDB_Ca...
Cannot download Docker images behind a proxy
...
First, create a systemd drop-in directory for the Docker service:
mkdir /etc/systemd/system/docker.service.d
Now create a file called /etc/systemd/system/docker.service.d/http-proxy.conf that adds the HTTP_PROXY environment variable:
[Service]
Environment="HTTP_PROXY=http://proxy.example.com:80...
How do I perform the SQL Join equivalent in MongoDB?
... is small. It is going to bring each book content to your client and then fetch each category, lending and authors one by one. The moment your books are in thousands, this would go really really slow. A better technique probably would be to use aggregation pipeline and output the merged data into a...
How to install MySQLdb (Python data access library to MySQL) on Mac OS X?
...urce.
In general macports (or fink) help when there are complex libraries etc that need to be installed.
Python only code and if simple C dependencies can be set up via setuptools etc, but it begins to get complex if you mix the two.
...
How to use filter, map, and reduce in Python 3
...f noiters(*funcs):
if not funcs:
funcs = [map, filter, zip] # etc
from functools import reduce
globals()[reduce.__name__] = reduce
for func in funcs:
globals()[func.__name__] = lambda *ar, func = func, **kwar: list(func(*ar, **kwar))
try:
yield
finall...
“Single-page” JS websites and SEO
...of it is that I use ERB or HAML templates (running Ruby on Rails, Sinatra, etc) for my server side render and to create the client side templates that Backbone can use, as well as for my Jasmine JavaScript specs. This cuts out the duplication of markup between the server side and the client side.
F...
What is the difference between a static and a non-static initialization code block
... the time it is used when doing database connection, API init, Logging and etc.
Don't just bark! where is example?
package com.example.learnjava;
import java.util.ArrayList;
public class Fruit {
static {
System.out.println("Inside Static Initializer.");
// fruits array
...
Servlet for serving static content
.... Or I'm wrong? (I'm new in Java EE) I usually use url pattern /css/* and etc.
– SemperPeritus
Jun 2 '17 at 15:48
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What is __declspec and when do I need to use it?
...d), for exporting functions sans a DEF file you use __declspec(dllexport), etc. The full list is quite long.
– Seva Alekseyev
Feb 17 '10 at 21:49
...