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public class HelloYaml {
	@SuppressWarnings("unchecked")
	public static void main(String[] args) throws FileNotFoundException {
		Yaml yaml = new Yaml();
	
		System.out.println(yaml.dump(yaml.load(new FileInputStream(new File(
				"hello_world.yaml")))));

		Map<String, Map<String, String>> values = (Map<String, Map<String, String>>) yaml
				.load(new FileInputStream(new File("hello_world.yaml")));

binfeng

Quick uninstall JetBrains settings:

curl -sL https://gist.githubusercontent.com/denji/9731967/raw/jetbrains-uninstall.sh | sudo bash -s

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// Q sample by Jeff Cogswell

/*===========
 We want to call these three functions in sequence, one after the other:
 
 First we want to call one, which initiates an ajax call. Once that ajax call
 is complete, we want to call two. Once two's ajax call is complete, we want to call three.
 
 BUT, we don't want to just call our three functions in sequence, as this quick 
 demo will show. Look at this sample function and think about what order 

binfeng

#!/usr/bin/python
# -*- coding: utf-8 -*-

def xpath_soup(element):
    # type: (typing.Union[bs4.element.Tag, bs4.element.NavigableString]) -> str
    """
    Generate xpath from BeautifulSoup4 element.

    :param element: BeautifulSoup4 element.
    :type element: bs4.element.Tag or bs4.element.NavigableString

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{0: 'tench, Tinca tinca',
 1: 'goldfish, Carassius auratus',
 2: 'great white shark, white shark, man-eater, man-eating shark, Carcharodon carcharias',
 3: 'tiger shark, Galeocerdo cuvieri',
 4: 'hammerhead, hammerhead shark',
 5: 'electric ray, crampfish, numbfish, torpedo',
 6: 'stingray',
 7: 'cock',
 8: 'hen',
 9: 'ostrich, Struthio camelus',

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psql: FATAL: Peer authentication failed for user “postgres” (or any user)

The connection failed because by default psql connects over UNIX sockets using peer authentication, that requires the current UNIX user to have the same user name as psql. So you will have to create the UNIX user postgres and then login as postgres or use sudo -u postgres psql database-name for accessing the database (and psql should not ask for a password).

If you cannot or do not want to create the UNIX user, like if you just want to connect to your database for ad hoc queries, forcing a socket connection using psql --host=localhost --dbname=database-name --username=postgres (as pointed out by @meyerson answer) will solve your immediate problem.

But if you intend to force password authentication over Unix sockets instead of the peer method, try changing the following pg_hba.conf* line:

from

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#!/usr/bin/env python
import urllib, sys, bs4
print bs4.BeautifulSoup(urllib.urlopen("http://data.alexa.com/data?cli=10&dat=s&url="+ sys.argv[1]).read(), "xml").find("REACH")['RANK']