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How to get the IP address of the docker host from inside a docker container
...meta-data for the host is still available from inside the container.
curl http://169.254.169.254/latest/meta-data/local-ipv4
For example:
$ docker run alpine /bin/sh -c "apk update ; apk add curl ; curl -s http://169.254.169.254/latest/meta-data/local-ipv4 ; echo"
fetch http://dl-cdn.alpinelinux...
How does collections.defaultdict work?
...
There is a great explanation of defaultdicts here: http://ludovf.net/blog/python-collections-defaultdict/
Basically, the parameters int and list are functions that you pass. Remember that Python accepts function names as arguments. int returns 0 by default and list returns a...
How to get the name of a function in Go?
...the line number, but here is how I do it in my Tideland Common Go Library (http://tideland-cgl.googlecode.com/) using the "runtime" package:
// Debug prints a debug information to the log with file and line.
func Debug(format string, a ...interface{}) {
_, file, line, _ := runtime.Caller(1)
...
How to specify maven's distributionManagement organisation wide?
...nization.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0&l...
What does it mean for a data structure to be “intrusive”?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Where to define custom error types in Ruby and/or Rails?
...cationError; end
end
an example of this would be something like this in httparty
For Ruby on Rails
Put them in your lib/ folder under a file called exceptions.rb, which would look something like this:
module Exceptions
class AuthenticationError < StandardError; end
class InvalidUsername...
Is git good with binary files?
... can use git-annex to store the data outside of the repository. Check out: http://git-annex.branchable.com/
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Removing duplicate objects with Underscore for Javascript
...=2}, Object {a=3}, Object {a=4}]
Notes:
Callback return value used for comparison
First comparison object with unique return value used as unique
underscorejs.org demonstrates no callback usage
lodash.com shows usage
Another example :
using the callback to extract car makes, colors from a lis...
how to check if a file is a directory or regular file in python? [duplicate]
...
use os.path.isdir(path)
more info here http://docs.python.org/library/os.path.html
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Get model's fields in Django
...e 1.3 or 1.4. I imagine effort will be made to ensure things are backwards compatible, because lots of people have been using it anyway.
If you're particularly concerned about compatibility, write a function that takes a model and returns the fields. This means if something does change in the futur...