Pippy

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The Pippy interface

Description & Goals

Summary

Teaches Python programming by providing access to a fully interactive Python interpreter.?

The user can type simple expressions with some mathematical functions and execute the expression. This means that there is some overlap between Pippy and Calculate.

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Goals

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Collaboration

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Examples

Please add examples here, or modify the existing ones!

Math

Apples

Author: Madeleine Ball

print "Let's do math!"

print "On Monday I picked 22 apples. On Tuesday I picked 12."

print "Now I have: ", 22 + 12

print "My brother says he picked twice as many apples last week."

print "This means he picked: ", (22 + 12) * 2

print "I have 3 friends I would like to give apples."

print "One third of my apples is about: ", (22 + 12) / 3

print "Or, more exactly: ", (22.0 + 12.0) / 3.0

Pascal's triangle

Author: Madeleine Ball

# Pascal's triangle
lines = 8

vector = [1]

for i in range(1,lines+1):
  vector.insert(0,0)
  vector.append(0)

for i in range(0,lines):
  newvector = vector[:]
  for j in range(0,len(vector)-1):
    if (newvector[j] == 0):
      print "  ",
    else:
      print "%2d" % newvector[j],
    newvector[j] = vector[j-1] + vector[j+1]
  print
  vector = newvector[:]

Sierpinski triangle

Author: Madeleine Ball

Modification of the Pascal's triangle program to produce Sierpinski triangles.

size = 5
modulus = 2

lines = modulus**size

vector = [1]
for i in range(1,lines+1):
  vector.insert(0,0)
  vector.append(0)

for i in range(0,lines):
  newvector = vector[:]
  for j in range(0,len(vector)-1):
    if (newvector[j] == 0):
      print " ",
    else:
      remainder = newvector[j] % modulus
      if (remainder == 0):
        print "O",
      else:
        print ".",
    newvector[j] = vector[j-1] + vector[j+1]
  print
  vector = newvector[:]

Times1

Author: Chris Ball

for i in range(1,13):
    print i, "x 4 =", (i*4)

Times2

Author: Chris Ball

number = input("Which times table? ")
for i in range(1,13):
    print i, "x", number, "=", i*number

Fibonacci Series

Author : Rafael Ortiz

a, b = 0, 1
while b < 1001:
     print b,
     a, b = b, a+b

Pythagoras

Author : Rafael Ortiz

import math
from math import sqrt

print "This is the Pythagoras Theorem"
a=float(raw_input("Type a ="))
b=float(raw_input("Type b ="))

c=sqrt((a*a)+(b*b))

print "c =",c

Factorize

Author: Reinier Heeres

import math
import sys

orignum = input("Enter a number to factorize ")

factors = []
num = orignum
i = 2
while i <= math.sqrt(num):
    if num % i == 0:
        factors.append(i)
        num /= i
        i = 2
    elif i == 2:
        i += 1
    else:
        i += 2

factors.append(num)

if len(factors) == 1:
    print "%d is prime" % orignum
else:
    sys.stdout.write("%d is %d" % (orignum, factors[0]))
    for fac in factors[1:]:
        sys.stdout.write(" * %d" % fac)
    print

Zeros of a second degree polynomial

Author: Pilar Saenz

import math
from math import sqrt

print "These are the zeros of a second grade polynomial"
a=float(raw_input("Type a ="))
b=float(raw_input("Type b ="))
c=float(raw_input("Type c ="))
aux=b*b-4*a*c;
if aux>0:
    x1=(-b+sqrt(aux))/(2*a)
    x2=(-b-sqrt(aux))/(2*a)
    print "x1= " , x1 ,", x2=" ,x2 
elif aux==0:
    print "x= " , -b/(2*a)
else:
    x1=(-b+sqrt(-aux)*1j)/(2*a)
    x2=(-b+sqrt(-aux)*1j)/(2*a)
    print "x1= " , x1 , ", x2" , x2 

Factorial of a number

Author: Pilar Saenz

def factorial(a):
  fac=a
  for i in range(1,a):
    fac=fac*i
  print  a,"!=",fac

a=int(raw_input("Type a="))
factorial(a)

Greatest common divisor

Author: Pilar Saenz

n= input("Enter a number ")
m= input("Enter another number ")
r=n%m
if r!=0:
    while (r!=0):
        n=m
        m=r 
        r=n%m  
print "The greatest common divisor is ", m

Python

Function

Author: Chris Ball

def square(x): 
    print x * x

square(3)
square(4)

If

Author: Chris Ball

number = input("Enter a number: ")

if number > 5:
    print "Greater than 5"
elif number < 5:
    print "Less than 5"
else:
    print "Number is 5!"

Recursion

Author: Mel Chua

# Note this assumes you understand functions and if-else.
def countbackwards(number):
    print "I have the number", number
    if number > 0:
        print "Calling countbackwards again!"
        countbackwards(number-1)
    else:
        print "I am done counting"

number = input("Enter a number: ")
countbackwards(number):

While

Author Pilar Saenz

n=input("enter a number")
while n>0:
  print  n, " ",
  n=n-1
print "Surprise!\n"

Title Case Capitalisation

Author: Alan Davies

# This is an example of a list comprehension
oldtitle = "this TITLE iS NOW coRRecTly CAPItalised"
oldwords = oldtitle.split()
newwords = [word[0].upper() + word[1:].lower() for word in oldwords]
newtitle = " ".join(newwords)
print "Before:", oldtitle
print "After:", newtitle

Names Drawn From a Hat

Author: Alan Davies

# Simple and possibly useful program for
# drawing names in a random order from a hat
import random
names = []
name = raw_input("Enter the first name to go in the hat:")
while name != "":
    names.append(name)
    name = raw_input("Enter another name, leave blank if you have finished:")
random.shuffle(names)
print "The random order from the hat is:"
for x in range(len(names)):
    print x+1, names[x]

String

Hello1

Author: Chris Ball

print "Hello everyone!"

Hello2

Author: Chris Ball

name = raw_input("Type your name here: ")
print "Hello " + name + "!"

Thanks

Author: Walter Bender

Comment: Please add names as appropriate

import random
from random import choice

table = {
          'Hardware & Mechanicals': 'John Watlington, Mark Foster, Mary Lou Jepsen, Yves Behar, Bret Recor, Mitch Pergola, Martin Schnitzer, Kenneth Jewell, Kevin Young, Jacques Gagne, Nicholas Negroponte, Frank Lee, Victor Chau, Albert Hsu, HT Chen, Vance Ke, Ben Chuang, Johnson Huang, Sam Chang, Alex Chu, Roger Huang, and the rest of the Quanta team, the Marvell team, the AMD team, the ChiMei team..',
          'Firmware':               'Ron Minnich, Richard Smith, Mitch Bradley, Tom Sylla, Lilian Walter, Bruce Wang..',
          'Kernel & Drivers':       'Jaya Kumar, Jon Corbet, Reynaldo Verdejo, Pierre Ossman, Dave Woodhouse, Matthew Garrett, Chris Ball, Andy Tanenbaum, Linus Torvalds, Dave Jones, Andres Salomon, Marcelo Tosatti..',
          'Graphics systems':       'Jordan Crouse, Daniel Stone, Zephaniah Hull, Bernardo Innocenti, Behdad Esfahbod, Jim Gettys, Adam Jackson, Behdad Esfahbod..',
          'Programming':            'Guido Van Rossum, Johan Dahlin, Brian Silverman, Alan Kay, Kim Rose, Bert Freudenberg, Yoshiki Ohshima, Takashi Yamamiya, Scott Wallace, Ted Kaehler, Stephane Ducasse, Hilaire Fernandes..',
          'Sugar':                  'Marco Pesenti Gritti, Dan Williams, Chris Blizzard, John Palmieri, Lisa Strausfeld, Christian Marc Schmidt, Takaaki Okada, Eben Eliason, Walter Bender, Tomeu Vizoso, Simon Schampijer, Reinier Heeres, Ben Saller, Miguel Alvarez..',
          'Activities':             'Erik Blankinship, Bakhtiar Mikhak, Manusheel Gupta, J.M. Maurer (uwog) and the Abiword team, the Mozilla team, Jean Piche, Barry Vercoe, Richard Boulanger, Greg Thompson, Arjun Sarwal, Cody Lodrige, Shannon Sullivan, Idit Harel, and the MaMaMedia team, John Huang, Bruno Coudoin, Eduardo Silva, H&?kon Wium Lie, Don Hopkins, Muriel de Souza Godoi, Benjamin M. Schwartz..',
          'Network':                'Michael Bletsas, James Cameron, Javier Cardona, Ronak Chokshi, Polychronis Ypodimatopoulos, Simon McVittie, Dafydd Harries, Sjoerd Simons, Morgan Collett, Guillaume Desmottes, Robert McQueen..',
          'Security':               'Ivan Krstic, Michael Stone, C. Scott Ananian, Noah Kantrowitz, Herbert Poetzl, Marcus Leech..',
          'Content':                'SJ Klein, Mako Hill, Xavier Alvarez, Alfonso de la Guarda, Sayamindu Dasgupta, Mallory Chua, Lauren Klein, Zdenek Broz, Felicity Tepper, Andy Sisson, Christine Madsen, Matthew Steven Carlos, Justin Thorp, Ian Bicking, Christopher Fabian, Wayne Mackintosh, the OurStories team, Will Wright, Chuck Normann..',
          'Testing':                'Kim Quirk, Alex Latham, Giannis Galanis, Ricardo Carrano, Zach Cerza, John Fuhrer..',
          'Country Support':        'Carla Gomez Monroy, David Cavallo, Matt Keller, Khaled Hassounah, Antonio Battro, Audrey Choi, Habib Kahn, Arnan (Roger) Sipitakiat',
          'Administrative Support': 'Nia Lewis, Felice Gardner, Lindsay Petrillose, Jill Clarke, Julia Reynolds, Tracy Price, David Robertson, Danny Clark',
          'Finance & Legal':        'Eben Moglen, Bruce Parker, William Kolb, John Sare, Sandra Lee, Richard Bernstein, Jaclyn Tsai, Jaime Cheng, Robert Fadel, Charles Kane (Grasshopper), Kathy Paur, Andriani Ferti',
          'PR and Media':           'Larry Weber, Jackie Lustig, Jodi Petrie, George Snell, Kyle Austin, Hilary Meserole, Erick A. Betancourt, Michael Borosky, Sylvain Lefebvre, Martin Le Sauteur',
          'Directors & Advisors':   'Howard Anderson, Rebecca Allen, Ayo Kusamotu, Jose Maria Aznar, V. Michael Bove, Jr., Rodrigo Mesquita, Seymour Papert, Ted Selker, Ethan Beard (Google); John Roese (Nortel); Dandy Hsu (Quanta); Marcelo Claure (Brightstar); Gary Dillabough (eBay); Gustavo Arenas (AMD); Mike Evans (Red Hat); Ed Horowitz (SES Astra); Jeremy Philips (NewsCorp); Scott Soong (Chi Lin); Sehat Sutardja (Marvell); Joe Jacobson (MIT Media Lab); Steve Kaufman (Riverside); and Tom Meredith (MFI)',
          'Pippy':                  'Chris Ball'
       }
 
print "OLPC would like to take this opportunity to acknowledge the community of people and projects that have made the XO laptop possible."

subsystem = random.choice(table.keys());
print subsystem, '\t',table[subsystem]

Graphics

Jump

Author: C. Scott Ananian

# both of these functions should be in the 'basic' package or some such
def clear_scr():
    print '\x1B[H\x1B[J' # clear screen, the hard way.
def wait():
    import time
    time.sleep(0.1)

# jumping man!
# was having to escape the backslash which was rather unfortunate, 
# now using python's r" strings which were meant for regex's
# i didn't have to do that in C64 BASIC
for i in xrange(0,50):
    clear_scr()
    print r"\o/"
    print r"_|_"
    print r"   "
    wait()
    
    clear_scr()
    print r"_o_"
    print r" | "
    print r"/ \"
    wait()
    
    clear_scr()
    print r" o "
    print r"/|\"
    print r"| |"
    wait()
    
    clear_scr()
    print r"_o_"
    print r" | "
    print r"/ \"
    wait()

Mandelbrot Set

Author: Alan Davies

# Text-based Mandelbrot set generator
# Play with the values of 'centre' and 'realsize'
# to explore the set.
centre, realsize, maxiter = -.7+0j, 2.8, 50
width, height, aspect = 60, 30, 1.9
charmap = "abcdefghijklmnopqrstuvwxyz"
for y in range(height):
    output = ""
    for x in range(width):
        real = (float(x)/width-.5)*realsize
        imag = (float(y)/height-.5)*aspect*realsize*height/width
        z = c = complex(real, imag) + centre
        iterations = 0
        while abs(z) < 2 and iterations < maxiter:
            z = z**2 + c
            iterations += 1
        if iterations == maxiter:
            output += " " 
        else:
            output += charmap[iterations%len(charmap)]
    print output

Games

Guess a number

Author: Pilar Saenz

import random
from random import randrange
R = randrange(1,100)


print "Guess a number between 1 and 100!!!"
N = input("Enter a number: ")
i=1
while (N!=R):
  if N>R :
    print "Too big... try again"
  else :
    print "Too small.. try again"
  N = input("Enter a number: ")
  i=i+1
print "You got it in ", i, "tries"

Robots

Author: Alan Davies

This is a playable implementation of Robots (also known as Daleks). I tried to keep the code clear and well commented, even at the expense of space. I also made sure that the lines don't wrap in Pippy, as that looks quite ugly.

I'm not sure if this is considered too large for the samples to be included with Pippy- a simpler implementation could be trimmed down considerably. I figured it might be nice to have at least one complete implementation for kids and adults to play with.

from random import randint
import curses
stdscr = curses.initscr()
curses.noecho()

xmax, ymax, alive = 60, 10, True
commands = {"q":(-1,-1), "w":(0,-1), "e":(1,-1),
            "a":(-1,0),  "s":(0,0),  "d":(1,0),
            "z":(-1,1),  "x":(0,1),  "c":(1,1),
            " ":(0,0),   "t":(0,0)}

def message(text, yoffset=0, wait=True):
    stdscr.addstr(ymax/2+yoffset, xmax/2-len(text)/2, text)
    stdscr.refresh()
    if wait:
        stdscr.getch()

message("Welcome to Robots!", -3, False)
message("          QWE    Screwdriver: S       ", -1, False)
message("Movement: A D    Teleport:    T       ", 0, False)
message("          ZXC    Do nothing:  Spacebar", 1, False)
message("Press any key...", 3)

while True:
  level = 1
  alive = True

  while alive:       
    # Initialise powers, hero position, and enemy lists
    teleport = screwdriver = True
    hero = (xmax/2, ymax/2)
    scrap = [(randint(0, xmax), randint(0, ymax))
             for dummy in range(level/3+3)]
    robots = [(randint(0, xmax), randint(0, ymax))
              for dummy in range(level*4-3)]
    scrap = [s for s in scrap if s != hero] 
    robots = [r for r in robots if r != hero]

    while True:         
      # move crashed robots to scrap list
      scrap += [r for r in robots if robots.count(r) >= 2]
      robots = [r for r in robots if scrap.count(r) == 0]

      # draw the screen
      stdscr.clear()
      stdscr.addstr(hero[1], hero[0], "@")
      for robot in robots:
        stdscr.addstr(robot[1], robot[0], "$")
      for scr in scrap:
        stdscr.addstr(scr[1], scr[0], "#")
      if screwdriver:
        stdscr.addstr(ymax-1, xmax+1, "S")
      stdscr.addstr(ymax, xmax+1,"T" if teleport else "")
      stdscr.refresh()

      # test for win or loss
      if len(robots) == 0:
        break
      elif hero in robots or hero in scrap:
        stdscr.addstr(hero[1], hero[0], "X")
        message("You lost! Press any key...")
        alive = False
        break

      # get a valid keypress	    
      key = ""
      while key not in commands:
        key = chr(stdscr.getch()).lower()

      # teleport - move to a random location
      if teleport and key == "t":
        teleport = False
        hero = (randint(0, xmax), randint(0, ymax ))

      # sonic screwdriver - scraps nearby robots
      if screwdriver and key == "s":
        screwdriver = False
        scrap += [robot for robot in robots
                  if abs(robot[0] - hero[0]) <= 1
                  and abs(robot[1] - hero[1]) <= 1]
        robots = [r for r in robots if scrap.count(r) == 0]

      # update hero and robot positions
      hero = (hero[0] + commands[key][0],
              hero[1] + commands[key][1])
      def sign(x): return (x / abs(x)) if x else 0
      def follow(fr, to): return (fr[0] + sign(to[0]-fr[0]),
                                  fr[1] + sign(to[1]-fr[1]))
      robots = [follow(robot, hero) for robot in robots]

    # move to next level
    if alive:
      level += 1
      message(" Level %d! Press any key... " % level)

Beginning Programming

C. Scott Ananian created a small library of programming examples, based on the BASIC examples in the Commodore 64 manual. It can be found at http://dev.laptop.org/git?p=users/cscott/pippy-examples;a=tree