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class Tree(dict):
  """A Tree is a dict-like object that nests arbitrarily.

  It supports both `tree["key"]` and `tree.key` syntax for lookups.
  A lookup for a missing key, by either syntax, results in creation
  of a new nested tree, e.g.

  >>> tree = Tree()
  >>> tree.a.b.c = "d"
  >>> tree

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import functools

def delayed(fn):
    """Convert fn into delayed_fn with delayed(fn).
    
    Take a function and convert it into a function that, rather than invoking
    the function's call, instead returns a 3-tuple of `(fn, args, kwargs)`.
    
    This can then be later called with the simple `fn(*args, **kwargs)` application
    syntax, or the 3-tuple can be passed to other APIs that expect it, like 

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postgres:
  image: postgres:9.4.4
  ports:
    - "5432:5432"
redis:
  image: redis:2.8.21
  ports:
    - "6379:6379"
elasticsearch:
  image: elasticsearch:1.7.2

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from __future__ import print_function

import elasticsearch
import collections
import json

def flatten(d, parent_key='', sep='_'):
    items = []
    for k, v in d.items():
        new_key = parent_key + sep + k if parent_key else k

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#!/bin/sh

# on Ubuntu 14.04, set a pm-hibernate resume hook
# which is placed in /etc/pm/sleep.d/00_intel_pstate

# it sets up CPU intel pstate appropriately, which by default
# gets ruined by being scaled down to 50% of max CPU without the
# easy ability to change it back; also sets governor to performance
# for good measure, since apparently default is "powersave"

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#/bin/bash
# weird one-liner to find top 100 Python imports in a project
# stolen/customized from Chris H. Wiggins @ https://gist.github.com/chrishwiggins/7518300e0d8649d8d791
find . -name '*.py' | grep -v -e '/venv/' -e '(' -e ')' | \
         xargs -I % grep import % | sed -e 's/^[ ]*//' | \
         grep -e '^from ' -e '^import '  | awk '{print $2}' | \
         sed -e 's/^[\.]*//' | cut -d\. -f1 | tr '[A-Z]' '[a-z]' | \
         sort -bfd | uniq -c | sort -nr | head -100

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PyQt App

A PyQt application needs special build instructions.

PySide Setup

To install PySide, you'll need to follow the [PySide installation guide][pyside-install], which will likely installing Qt at the system level along with development headers.

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Index aliasing lets us version and swap indices without downtime, which could improve the rebuild path.

This is the "swap" operation that would be used for upgrade_index.

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices-aliases.html

-XPOST localhost:9200/_aliases
{
    "actions": [
        { "remove": {

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Lucene Fundamentals

A useful set of Lucene fundamentals that are good for grok'ing Elasticsearch.

Jargon Glossary

• document: a record; the unit of search; the thing returned as search results
• field: a typed slot in a document for storing and indexing values
• index: a collection of documents, typically with the same field mappings or schema
• corpus: the entire set of documents in an index