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import os
import shutil

def make_dir(name):
    raise Exception() 
    if not os.path.exists("target /" + name):
        os.mkdir("target /" + name)

def main():
    file_list = os.listdir("./files")

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def main():
    f = open("twain.txt")
    text = f.read()
    f.close()

    text = text.lower()

    num_letters = [0] * 26

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#!/usr/bin/env python
from math import sqrt

def pearson(pairs):
    # Takes in a list of pairwise ratings and produces a pearson similarity
    series_1 = [float(pair[0]) for pair in pairs]
    series_2 = [float(pair[1]) for pair in pairs]

    sum1 = sum(series_1)
    sum2 = sum(series_2)

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#define XPIN 2
#define YPIN 1
#define ZPIN 0

#define MAX_POINTS 48
#define ACTUAL_POINTS 16

unsigned long readTimer = 0;
unsigned long reportTimer = 0;
unsigned long lastTimer = 0;

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Exercise 02: Math and functions
=======

Introduction
--------
We're taught mathematical notation using 'infix' notation, that is, the operator goes between the numbers:

    eg: In '3 + 2', the operator, '+', goes between the operands, 3 and 2.

An alternate notation for math is called 'prefix'. As you might have guessed, in prefix notation, the operator goes in front of the operands:

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def count(filename):
    f = open(filename)
    text = f.read()
    text.lower()
    
    
    letters = [0] * 26
    for letter in text:
        index = ord(letter) - ord("a")
        if index >= 0  and index < 26:

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Exercise 05: Files, Creative uses of lists
==========================================

Introduction
------------
Files can be opened using the .open method, and then processed one character at a time as a bytestream using the .read method with an argument of 1:

    f = open("myfile.txt")
    firstletter = f.read(1)
    f.close()

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def custom_len(input_list):
    """custom_len(input_list) imitates len(input_list)"""
    count = 0
    for item in input_list:
        count += 1
    return count

def custom_remove(input_list, value):
    """custom_remove(input_list, value) imitates input_list.remove(value)"""
    for i in range(custom_len(input_list)):

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class case(object):
    EMPTY_CASE = (None for x in [1])
    def __init__(self, *args):
        self.cases = args
        self.used = False

    def __iter__(self):
        return self

    def next(self):

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def cross(A, B):
    "Cross product of elements in A and elements in B."
    return [a+b for a in A for b in B]

digits   = '123456789'
rows     = 'ABCDEFGHI'
cols     = digits
squares  = cross(rows, cols)
unitlist = ([cross(rows, c) for c in cols] +
            [cross(r, cols) for r in rows] +