danielrobertson

def range(begin, end = None, step = 1):
	if step == 0: 
		raise Exception("Step size cannot be 0")
	if end == None:
		end, begin = begin, 0
	while (abs(begin + step - end)) <= (abs(begin - end)):
		yield begin
		begin += step
 
assert(list(range(10)) == [0, 1, 2, 3, 4, 5, 6, 7, 8, 9])

danielrobertson

/* -----------------------------------------------------------------------
1. Show the cycle for 3.
   What is the cycle length?
   [Collatz]
   (2 pts)

3, 10, 5, 16, 8, 4, 2, 1
8
*/

danielrobertson

import math

def stddev(numbers): 
	n = len(numbers) 
	mean = sum(numbers) / n 
	dev = [x - mean for x in numbers] 
	dev2 = [x * x for x in dev] 
	return math.sqrt(sum(dev2) / n)

danielrobertson

def z_score(n, l): 
	mean = sum(l) / len(l)
	return (n - mean) / (stddev(l) / math.sqrt(len(l)))

danielrobertson

// create file:
sudo vim /usr/share/applications/intellij.desktop
 
// add the following
[Desktop Entry]
Version=13.0
Type=Application
Terminal=false
Icon[en_US]=/home/daniel/idea-IC-135.690/bin/idea.png
Name[en_US]=IntelliJ

danielrobertson

// load the MySQL driver. Alternatively, use the Maven http://mvnrepository.com/artifact/mysql/mysql-connector-java/5.1.33
Class.forName("com.mysql.jdbc.Driver");

// connect to database named openstack_projects on port 3306
String url = "jdbc:mysql://localhost:3306/openstack_projects";
Connection conn = DriverManager.getConnection(url, "root", "");

// make a query
String sql = "select * from projects";
PreparedStatement preparedStatement = conn.prepareStatement(sql);

danielrobertson

{
    "registration": {
        "children": [
            {
                "firstName": "joe",
                "lastName": "bro",
                "dob": "11 march 1990"
            },
            {
                "firstName": "jay",

danielrobertson

import pandas as pd
toclean = pd.read_csv('fileWithDuplicates.csv')
deduped = toclean.drop_duplicates('columnName')
deduped.to_csv('fileWithoutDuplicates.csv')

danielrobertson

[user]
	name = Daniel Robertson
	email = [email protected]

[alias]
  p = pull 
  a = add
  st = status
  ci = commit
  br = branch

danielrobertson

class Multiton {
	static HashMap<String, Multiton> map = new HashMap<String, Multiton>(); 
	
	private Multiton(String key) { ... }
	
	static Multiton newMultion(String key) {
		result = map.get(key); 
		if(result == null) {
			result = new Multiton(key); 
			map.add(key, result);