RobertSudwarts

import math
import numpy
import matplotlib.pyplot
import scipy.stats

# See [Hull], Chapter 13. The pricing formulae are given in Section 13.8

def d1(S0, K, r, sigma, T):
   return (math.log(S0 / K) + (r + sigma**2 / 2) * T) / (sigma * math.sqrt(T))

RobertSudwarts

"""
Installation for debian based distros

You will of course need the tex library installed:
  $ sudo apt-get install texlive
  
And SWIG is required for dealing with texcaller's 'C' wrapper.
  $ sudo apt-get install swig

Download the texcaller package from github and 'make' the 

RobertSudwarts

# 12345 -> '54321'  [the returned value is a string]
reverse = lambda x: str(x)[::-1]

# translate each element of x to a string and join eg. [18, 3, 2] -> '1832'
strjoin = lambda x: "".join(map(str, x))

# '1832' -> 1 + 8 + 3 + 2 -> 14
sumstr = lambda x: sum(int(n) for n in x)

# compute the number which must be added to `x` to get to the nearest 10

RobertSudwarts

One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

RobertSudwarts

def degrees_to_cardinal(d):
    '''
    note: this is highly approximate...
    '''
    dirs = ["N", "NNE", "NE", "ENE", "E", "ESE", "SE", "SSE",
            "S", "SSW", "SW", "WSW", "W", "WNW", "NW", "NNW"]
    ix = int((d + 11.25)/22.5)
    return dirs[ix % 16]

RobertSudwarts

from geventwebsocket.handler import WebSocketHandler
from gevent.pywsgi import WSGIServer
from flask import Flask, request, render_template

app = Flask(__name__)

@app.route('/')
def index():
    return render_template('index.html')

RobertSudwarts

/*global ko, Chart */

(function(ko, Chart) {

	ko.bindingHandlers.chartType = {
		init: function(element, valueAccessor, allBindings, viewModel, bindingContext) {
			if (!allBindings.has('chartData')) {
				throw Error('chartType must be used in conjunction with chartData and (optionally) chartOptions');
			}
		},

RobertSudwarts

#Newbie programmer
def factorial(x):
    if x == 0:
        return 1
    else:
        return x * factorial(x - 1)
print factorial(6)


#First year programmer, studied Pascal