kevinjqiu

class AppendOnlyModelMeta(DeclarativeMeta):
    @staticmethod
    def _get_append_only_attributes(cls):
        '''A helper method to get a list of append-only attributes
        declared on the class.'''
        [...]

    def __init__(cls, classname, bases, dict_):
        if hasattr(cls, '__history_class__'):
            cls._history_fields = cls._get_append_only_attributes(cls)

kevinjqiu

verisign,PayPal Payflow Pro,Lucre
paypaldirect,PayPal direct,lucre
paypalexpress,PayPal Express,offsite
paypaladaptive,PayPal,asynchronous
paypaladaptiveb2b,PayPal,asynchronous

kevinjqiu

from pretenders.server.server import run 
import multiprocessing                                                                                                                                         


ml = multiprocessing.Process(name='ml', target=run)
ml.start()


def _init():
    from pretenders.client.http import HTTPMock

kevinjqiu

MySQL demystified

How does MySQL execute queries?

• SQL => Parse Tree => Execution plan
• The execution plan is a data structure, not byte-code
• The executor makes storage engine calls

Execution plan

"Deep left tree" -- always

Explain output columns

kevinjqiu

Request handling models

Abstraction layer

• What is wsgi

PEP3333, a web server gateway interface, specifies how web server should communicate with web applications and how web applications can be chained together to process one request

• Benefit?

kevinjqiu

** Reason for termination ==
** {{badmatch,
     {{msg_status,13,
       <<247,153,167,208,33,41,98,109,106,45,132,14,79,220,50,7>>,
       {basic_message,
        {resource,<<"/.../trunk">>,exchange,<<"...">>},
        [<<"cardapp.txnfailed">>],
        {content,60,none,
         <<248,0,16,97,112,112,108,105,99,97,116,105,111,110,47,106,115,111,
           110,5,117,116,102,45,56,0,0,0,0,2,0>>,

kevinjqiu

def words():
    with open('/usr/share/dict/words', 'r') as f:
        return (x.strip().upper() for x in f.readlines())

MAPPING = {'A':'A', 'B':'B', 'C':'C', 'D':'D',
           'E':'E', 'F':'F', 'O':'0', 'S':'5', 'I':'1'}

def main():
    is_hexword = lambda word: all(ch in MAPPING for ch in word)
    for word in filter(is_hexword, words()):

kevinjqiu

(defn fizzbuzz []
  (map #(cond (= 0 (mod % 15)) "wibblefish" (= 0 (mod % 3)) "wibble" (=  0 (mod % 5)) "fish" :else %) (range 1 101)))

kevinjqiu

import random
import sys

def pick(switch):
    doors = ['car', 'goat', 'goat']
    random.shuffle(doors)

    choices = zip(range(len(doors)), doors)
    my_choice = random.choice(choices)
    rest_choices = filter(lambda x: x!=my_choice, choices)

kevinjqiu

#! /usr/bin/env python

import sys
import json

print json.dumps(json.loads(sys.stdin.read()), sort_keys=True, indent=4)