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Why implement interface explicitly?
...nstraint on T. While an object can generally only be safely cloned if its base can be, one may wish to derive from a base class which could be safely cloned an object of a class that can't. To allow for that, I'd recommend against having inheritable classes expose a public clone method. Instead h...
What is RPC framework and Apache Thrift?
...hine, written in C++ which offers some service to the world through a JSON-based protocol over HTTP. This service may be called by a client program written in Python, running on a Windows machine. The code for both server and client is generated from a Thrift IDL file. To get it running, you basical...
How to increase the maximum number of opened editors in IntelliJ?
...ng the Recent Files (Cmd+E) feature.
Works for all IntelliJ IDEA platform based IDEs.
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WebRTC vs Websockets: If WebRTC can do Video, Audio, and Data, why do I need Websockets? [closed]
...peer protocol. It's starting to see widespread use in industry as a server-based VOIP alternative.
– photicSphere
Jan 31 '18 at 0:42
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What is difference between monolithic and micro kernel?
...e. The kernel can invoke functions directly. Examples of monolithic kernel based OSs: Unix, Linux.
In microkernels, the kernel is broken down into separate processes, known as servers. Some of the servers run in kernel space and some run in user-space. All servers are kept separate and run in diffe...
Difference between rake db:migrate db:reset and db:schema:load
... runs (single) migrations that have not run yet.
db:create creates the database
db:drop deletes the database
db:schema:load creates tables and columns within the (existing) database following schema.rb
db:setup does db:create, db:schema:load, db:seed
db:reset does db:drop, db:setup
db:migrate:reset ...
How to check if a column exists in Pandas
...ments, you can use the get() method for DataFrames. For performing the sum based on the question:
df['sum'] = df.get('A', df['B']) + df['C']
The DataFrame get method has similar behavior as python dictionaries.
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Relative URL to a different port number in a hyperlink?
... For instance this modified code just worked for me and moves me from any base port to port 8069 (replace your port as required)
<div>
<a href="http://<?php print
$_SERVER{'SERVER_NAME'}; ?>:8069"><img
src="images/example.png"/>Example Base (http)</a>
<...
Haskell: Converting Int to String
...
An example based on Chuck's answer:
myIntToStr :: Int -> String
myIntToStr x
| x < 3 = show x ++ " is less than three"
| otherwise = "normal"
Note that without the show the third line will not compile.
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Convert RGBA PNG to RGB with PIL
...e's a version that's much simpler - not sure how performant it is. Heavily based on some django snippet I found while building RGBA -> JPG + BG support for sorl thumbnails.
from PIL import Image
png = Image.open(object.logo.path)
png.load() # required for png.split()
background = Image.new("R...