ocowchun

for tuple r in R:
	for tuple s in S:
		emit, if r and s match

ocowchun

import pandas as pd

file_path = 'your-file-path'
df = pd.read_csv(file_path)

df['code_snippet'] = df['content'].str.find('\n```\n') > 0
pattern = r'!\[.*\]\(.*\)'
df['image'] = df['content'].str.contains(pattern)

ocowchun

console.log(i); // Because we assign value to `i` after this line, it will print `undefined`. 
//I like extract the max number as a variable, for example `var max = 100`
for (var i = 1; i <= 100; i++) {
  var check = true;
//   I don't understand the logic here?
  for (var j= 2; j <=6; j++) {
    if(i%j ==0) {
      check =false;
    }
  }

ocowchun

function foo() {
  var i = 0;
  while (i < 10000000) {
    i = i + 1;
    if (i % 3000000 === 0) {
    }
  }
  return i;
}

ocowchun

install pyenv

https://github.com/yyuu/pyenv

$ brew install pyenv

install python 3.5

ocowchun

# Basic Uage of Pandas

## 讀取資料
```py
df = pd.read_csv('olympics.csv', index_col = 0, skiprows = 1)
```

## 選擇與過濾資料
```py
# 回傳第一筆資料

ocowchun

querycsv.py

This document will explain how to install querycsv, a tool to help you query csv file using sql.

#open terminal

$ which brew

# if console output `brew not found`, install homebrew first, else skip this command
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

ocowchun

namespace :sitemap do
  desc "unzip sitemap.xml.gz and upload to s3"
  task upload: :environment do
    gz_file_path=Rails.root.join('public', 'sitemap.xml.gz')
    file_path=Rails.root.join('public', 'sitemap.xml')
    Zlib::GzipReader.open(gz_file_path) do |gz|
      File.open(file_path, 'w') { |file| file.write(gz.read) }
    end
    upload_to_s3
  end

ocowchun

class Book < ActiveRecord::Base
  def self.search(options)
	# implement your search 
  end
end

class BooksController < ApplicationController
  def search
    options=params[:keyword]
    @books=Book.search(options)

ocowchun

var AWS = require('aws-sdk');
var autoscaling = new AWS.AutoScaling();
var ec2 = new AWS.EC2();
var AutoScalingGroupNames = ['your-asg-name'];

autoscaling.describeAutoScalingGroups({
	AutoScalingGroupNames: AutoScalingGroupNames
}, function(err, data) {
	var instances = data.AutoScalingGroups[0].Instances;
	var instanceIds = instances.map(instance => instance.InstanceId);