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 =

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

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

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

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

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?

	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)

	# 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)

	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

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