johnludwigm

import java.util.HashSet;
import java.util.Scanner;
import java.io.*;

public class HappyNumber {
    //Note that we did not account for the fact that all permutations of a happy number's digits
    //must also form happy numbers since addition commutes. This is mentioned in the README.
    private final static long ten = 10;
    static long squareSum(long number) {
        long total = 0;

johnludwigm

Problem:

We'll say that for a positive whole number n, the squareSum of n is the sum of the squares of the digits of n. So if n is 1406, then squareSum(n) is 1^(2) + 4^(2) + 0^(2) + 6^(2) = 1 + 16 + 0 + 36 = 53.

We further say that the k^(th)-squareSum of n is squareSum(squareSum(...(squareSum(n)))), where squareSum is composed k-many times. For example, the 3rd-squareSum of 1406 is squareSum(squareSum(squareSum(1406))) = squareSum(squareSum(53)) (as we know from above) = squareSum(5^(2) + 3^(2)) = squareSum(25 + 9) = squareSum(34) = 3^(2) + 4^(2) = 9 + 16 = 25.

Definition: A number n is happy if for some positive integer m, the m^(th)-squareSum of n is equal to 1.

johnludwigm

#February 6, 2018
#1. Give the return value of the following expression:
>>> 1, 2, 3, 4 == (1, 2, 3, 4)

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johnludwigm

import java.io.*;

class Main {
  public static void main(String[] args) {
    String fileName = "blog.txt";
    FileReader fileReader = new FileReader(fileName);
    
    BufferedReader br = new BufferedReader(fileReader);
    String line;
    

johnludwigm

>>> aws_access_key_id = "BLPEVU91RZCTCC4CE01J"
>>> aws_secret_access_key = "AOIjf2CEW2faefAErwrt43G/9OaJfijvansEJfib"
>>> region_name = "us-east-1"
>>> the_password_I_type = "MySecretPassword"
>>> ciphertext = encrypt(the_password_I_type.encode(), aws_secret_access_key.encode())
>>> #Let's take a look!
>>> ciphertext
'OJ+T8lHBRqxGyZjTsJjP634iBhjJImYyaep/nv03aCnQkv9+8+I/m+2m1dsAv9JGu6JjnUcVyQSd5WPUEAqSYg=='

johnludwigm

aws_secret_access_key = "BmUejjI9Fp23FAOJoijeRAJse/fAEIfo4FAJFIwe"

#It is absolutely infeasible to find a string which hashes to something
#that even remotely resembles your aws_secret_access_key.

the_password_I_will_enter = "MySecretPassword"

#Note that the_password_I_will_enter is a string rather than a bytes object:
"""
>>> isinstance("MySecretPassword", str)

johnludwigm

create_Title = ("CREATE TABLE IF NOT EXISTS Title ("
                 "tconst TEXT PRIMARY KEY, "
                 "title_type TEXT, "
                 "primary_title TEXT, "
                 "original_title TEXT, "
                 "is_adult INTEGER, "
                 "start_year INTEGER, "
                 "end_year INTEGER, "
                 "runtime_minutes INTEGER, "
                 "genres TEXT);")

johnludwigm

import sqlite3
import StreamTSV
import sqliteops
import create_statements as cts
import os

table_urls = [("Title", "https://datasets.imdbws.com/title.basics.tsv.gz"),
              ("Name", "https://datasets.imdbws.com/name.basics.tsv.gz"),

johnludwigm

dbpath = "/.../test.db"
>>> import sqlite3
>>> #Create the database.
>>> connection = sqlite3.connect(dbpath)
>>> cursor = connection.cursor()
>>> cursor.execute("CREATE TABLE Test (testcolumn TEXT);")
<sqlite3.Cursor object at 0x111952ce0>
>>> cursor.execute("INSERT INTO Test VALUES(NULL);")
<sqlite3.Cursor object at 0x111952ce0>

johnludwigm

import csv
import sys

def getmaxsize():
  """Returns max field size."""
  return csv.field_size_limit(sys.maxsize)


def setmaxsize(size = 500 * 1024 * 1024):
  """Sets max field size as high as possible."""