ceshine

"""A Simple Strategy Trading Two Stocks

Original code: https://blog.csdn.net/qq_26948675/article/details/80016633
Modified based on: https://www.backtrader.com/blog/posts/2018-04-22-improving-code/improving-code.html

Replaced the local CSV files with online data from IEX.

Unfortunately, this strategy is not profitable for the two stocks picked.
"""

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

ericflo

"""
I've been thinking lately about how perfect Redis would be for storing a
simple social graph. I posited that it would be relatively few lines of code,
and that it'd be clean code too. So here it is: a basic social graph built on Redis.
"""

class FriendGraph(object):
    
    def __init__(self, ring):
        self.ring = ring

ubermuda

<?php

class userActions extends sfActions
{
  public function executeCheckUsername(sfWebRequest $request)
  {
    $username     = $request->getParameter('username');
    $availability = (bool) Doctrine_Core::getTable('User')->checkUsername($username);

    return $this->renderText(json_encode($availability);