chairco

How to: Allow Node to bind to port 80 without sudo

TL;DR

Only do this if you understand the consequences: all node programs will be able to bind on ports < 1024

sudo setcap 'cap_net_bind_service=+ep' /usr/local/bin/node

Important: your node location may vary. Use which node to find it, or use it directly in the command:

chairco

二進位的轉換 str->bin, bin->str

參考: https://www.quora.com/How-do-I-convert-integers-to-binary-in-Python-3

int('0011',2) # 將 0011 轉換成 3

A = [[0,0,1,1], [0,0,0,1]]
return sum(int(''.join(map(str,a)),2) for a in A) #加總這兩個值

chairco

A string S consisting of N characters is considered to be properly nested if any of the following conditions is true:

S is empty; S has the form "(U)" or "[U]" or "{U}" where U is a properly nested string; S has the form "VW" where V and W are properly nested strings. For example, the string "{[()()]}" is properly nested but "([)()]" is not.

Write a function:

chairco

簡述

Luigi 是一個用來處理資料流的框架，支援 hadoop, hdfs, mysql, postgresql 等儲存庫。他的特點就是可以設定 task 之間相依性。因此可以用來處理複雜的 pipeline 批次工作。

架構

Luigi 主要的框架由幾個組成：require(), run(), output() 所有的任務會繼承 luigi.Task 類別然後透過這三個 method 來控制想執行任務。

import luigi

chairco

手動下載 Spark 和編譯

Download page 下載 2.2.0（下載當下為最新版本）

版本組合：

• Spark runs on Java 8+, Python 2.7+/3.4+ and R 3.1+. For the Scala API, Spark 2.2.0 uses Scala 2.11. You will need to use a compatible Scala version (2.11.x).
• Note that support for Java 7, Python 2.6 and old Hadoop versions before 2.6.5 were removed as of Spark 2.2.0.
• Note that support for Scala 2.10 is deprecated as of Spark 2.1.0, and may be removed in Spark 2.3.0.
• 2.2.0 版本一定要搭配 java 8 不然會噴出類似下面的錯誤 QQ

chairco

task1

gcloud compute instances create jumphost --machine-type f1-micro --zone us-east1-b

task2

gcloud config set compute/zone us-east1-b
gcloud container clusters create nucleus-webserver1
gcloud container clusters get-credentials nucleus-webserver1

chairco

Content

紀錄 2018 - 2020 解決 Leetcode 過程。

• leetcode_easy.md
• leetcode_medium.md
• leetcode_tree.md
• leetcode_db.md

chairco

ASGI (Asynchronous Server Gateway Interface) Specification

Version: 2.0 (2017-11-28)

Abstract 摘要 ========

This document proposes a standard interface between network protocol

chairco

2020/7/2

仁寶(2324)

• 投信除 7/1 賣外連買 10 日，且籌碼集中度 一日: 37.24%, 三日: 8.17%。主要一日與三日購買券商為合庫、台灣匯立、統一、元大皆為千張
• 除權息日期為 7/17，現金配息 1.2 元，以 7/2 收盤 19.6 元，換算後大約 6.12% 殖利率
• 低點 15 元到 19 元大約 26% 漲幅(落後其他相同產業)
• 歷史來看除息時價位大約都落在 19.x 元，填息不定，但每年大概都有填息
• 股本過大，大約四百萬張
• 外資持有部位大，投信持有部位小
• 本業沒有特別亮眼，沒有接到蘋果主力產品
• 目前主力開始發動第二天，可以小接兩張試試

chairco

技術指標

三角收斂

1. 當股市推移過程中每日低點位置逐漸推高，高點位置未創新高。會呈現底點連線逐漸增高，可視為市場推高底點價格(有人吃貨)待籌碼足夠則會表態強攻 ex: 緯創 20200710-202008