lxneng

db.adminCommand("listDatabases").databases.forEach( function (d) {
  if (d.name != "local" && d.name != "admin" && d.name != "config")
     db.getSiblingDB(d.name).dropDatabase();
})

lxneng

from multiprocessing import Pool
from functools import partial


def parallel_function(f):
    def parallize(f, seq):
        pool = Pool()
        pool.map(f, seq)
        pool.close()
        pool.join()

lxneng

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

lxneng

collection = db.getCollection('foo')
result = collection.aggregate( 
 [
                {"$group": { "_id": { fa: "$fa", fb: "$fb" } } }
            ]
        );
printjson(result);

lxneng

apt-get install libatlas-base-dev gfortran
pip install scipy

lxneng

Writing better python code

---

Swapping variables

Bad code

lxneng

#!/usr/bin/env python
# encoding: utf-8


class DictToObject(object):

    def __init__(self, dictionary):
        def _traverse(k, v):
            if isinstance(v, dict):
                return k, DictToObject(v)

lxneng

jQuery.extend(jQuery.validator.messages, {
    required: "This field is required.",
    remote: "Please fix this field.",
    email: "Please enter a valid email address.",
    url: "Please enter a valid URL.",
    date: "Please enter a valid date.",
    dateISO: "Please enter a valid date (ISO).",
    number: "Please enter a valid number.",
    digits: "Please enter only digits.",
    creditcard: "Please enter a valid credit card number.",

lxneng

scope :by_quarter, lambda { |quarter| 
    date = Date.new(Date.today.year, quarter * 3)
    where created_at: date.beginning_of_quarter..date.end_of_quarter }

lxneng

lxneng=# SELECT 'YESTERDAY'::date, 'TODAY'::date, 'TOMORROW'::date;
    date    |    date    |    date
------------+------------+------------
 2013-08-07 | 2013-08-08 | 2013-08-09
(1 row)

lxneng=# select now();
              now
-------------------------------
 2013-08-08 09:09:32.687512+08