zhangz

using System;
using MathNet.Numerics.LinearAlgebra.Double;
using MathNet.Numerics.LinearAlgebra.Double.Factorization;

namespace PolyRegressionCoefficients
{
    class Program
    {

        public static void DrawRegression(double[] coeffs, double[] xList)

zhangz

On the topic of tail calls in .NET

Let's say you have implemented a small data pipeline library to replace LINQ.

module TrivialStream =
  type Receiver<'T> = 'T            -> unit
  type Stream<'T>   = Receiver<'T>  -> unit

  module Details =

zhangz

unsafe private static void ShowAddress(string name, int[] item)
{
    fixed (int* addr = item)
    {
        Console.Write($"\t0x{(ulong)addr:X}");
    }
}

zhangz

• Celery: Distributed Task Queue http://www.celeryproject.org/
• https://github.com/gevent/gevent
• https://github.com/pytest-dev/pytest/
• https://github.com/fabric/fabric/ Simple, Pythonic remote execution and deployment.
• http://gunicorn.org/
• A Powerful Spider(Web Crawler) System in Python. https://github.com/binux/pyspider
• https://scrapy.org/
• Full-screen console debugger for Python https://github.com/asmeurer/PuDB
• Python job scheduling for humans. https://github.com/dbader/schedule
• https://github.com/Supervisor/supervisor

zhangz

# coding: utf8
import tushare as ts
import pandas as pd


def calcOneMinuteBar():
    # data_frame = pd.read_csv('AUDJPY-2016-01.csv', names=['Symbol', 'Date_Time', 'Bid', 'Ask'],
    #                         index_col=1, parse_dates=True)
    df = ts.get_tick_data('002743', date='2016-10-28')
    # df.tail(10)

zhangz

The Best of the Best Practices (BOBP) Guide for Python

A "Best of the Best Practices" (BOBP) guide to developing in Python.

In General

Values

• "Build tools for others that you want to be built for you." - Kenneth Reitz
• "Simplicity is alway better than functionality." - Pieter Hintjens

zhangz

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

zhangz

Convert SVN Repositories to Git Repositories

This guide on how to convert an SVN repository to a git repository was mostly taken from John Albin Wilkins post on Converting a Subversion repository to Git.

1. Retrieve a list of all Subversion committers

:

zhangz

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

• http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

Basic tenets

• Does the design expect failures to happen regularly and handle them gracefully?
• Have we kept things as simple as possible?

zhangz

using Microsoft.Diagnostics.Tracing;
using Microsoft.Diagnostics.Tracing.Session;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;

namespace ClrDacManaged
{
    class Program