The Mag Pi Issue 1 En

User Manual: The-MagPi-issue-1-en

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-M

Over the coming issues, The MagPi will

explore the exciting things that can be

done with this very special computer.

We will introduce you to the various

Raspberry Pi operating systems, how to

program in a range of languages, and

start your own interesting projects. We

aim to help experts and beginners get the

most out of the Raspberry Pi hardware

and more importantly help build a fun a

friendly community for everyone to get

involved with.

Contents

P.04

P.05

P.06

P.09

P.10

P.12

P.16

P.18

P.20

P.23

P.30

P.32

Affordable Computing

The Fall Of Programming

The Pioneers

Hardware Development

Skutter

RacyPy LiveCD & Virtual Machine

Debian VirtualBox

Programming

The Scratch Patch

The Python Pit

Feedback

Web Links & Credits

The ZX81 and Spectrum by Sinclair

Research, were among the first

affordable home computers available

during the early 1980's.

Although these 8-bit computers were

crude by today's standards, they gave

ordinary people the opportunity to

write computer programs and games.

The BBC Acorn computer was

backed by the British Government

for use in education and subsidies

were granted to schools. These

computers were a little too expensive

for most families to have at home.

The 'Electron' was Acorn's attempt at

addressing the price issue. They sold

a number of units, however despite

being more powerful on the hardware

side, the range of game titles was

significantly smaller than rivals

Sinclair and Commodore.

The Dawn Of

Affordable

Computing

Home computer users were becoming less

interested in writing their own programs.

Slick-looking, professionally made games that

were coming out of software publishing

companies were compelling.

Ocean Software for

example, boasted an

impressive library of

hit game titles such as

'Daley Thompson's

Decathlon', 'Chase

HQ' and 'New Zealand

Story'.

The trend of moving away from programming

followed within the education sector. Early

software packages like Wordstar, and Lotus 123

were difficult to use before the days of the

graphical interface, but typing skills, word

processing, spreadsheet and database training

continued to be the focus. Programming was seen

as a very specialist and niche area of study.

The Fall Of

Programming

The Pioneers

The story of how the Raspberry Pi computer came to be.

Cambridge and Beyond

A Tasty Bit Of RacyPy

>Programming

Here at the Python Pit, you will find Python and

Pygame programs to type in. Each month we will

bring you examples that will help to demonstrate

some of the commands and programming methods

to get you started writing your own code.

All of the programs are tested before the magazine

goes live, and will have a stamp underneath

showing which operating system and language

versions were used for the testing.

# ARITHMETIC

# By Jaseman - 23rd April 2012

print("Two plus two equals ",2+2); print()

print("Eight minus three equals ",8-3); print()

print("Four times two equals ",4*2); print()

print("Ten divided by two equals ",10/2); print()

N/A

# PUTTING TEXT ONTO THE SCREEN

# By Jaseman - 23rd April 2012

print("*** Welcome to The Python Pit! ***")

print() # A line space

print("Brought to you by The MagPi")

Note: The examples in this issue are written for Python 3. They will work on older versions by making a

change to all the print commands: Change print ("TEXT") to print "TEXT" - remove the ( ) brackets.

N/A

# SPARE ME THE DETAILS

# By Jaseman - 24th April 2012

print("Seven divided by three is",7/3); print()

print("Seven divided by three is roughly",int(7/3)); print()

print("Five divided by two is",5/2); print()

print("Five divided by two is roughly",int(5/2)); print()

N/A

# ALGEBRA

# By Jaseman - 24th April 2012

a=3

b=7

c=4

print("A is equal to",a); print()

print("B is equal to",b); print()

print("C is equal to",c); print()

print("A plus B equals",a+b); print()

print("A plus B plus C equals",a+b+c); print()

print("A plus B minus C equals",a+b-c); print()

# STRINGS OF WORDS

# By Jaseman - 24th April 2012

a = "If you"

b = "notice"

c = "this"

d = "you will"

e = "is not worth"

f = "noticing!"

print(a,b,c,b,d,b,c,b,e,f); print()

N/A

# COUNTING WITH FOR LOOPS

# By Jaseman - 24th April 2012

for n in range(0,10+1):

print(n)

N/A

# COUNTING WITH WHILE LOOPS

# By Jaseman - 24th April 2012

n=0

while n <= 10:

print (n)

n += 1

N/A

# LOTTERY NUMBERS

# By Jaseman - 24th April 2012

import random

for n in range(1,6+1): # We want six random numbers

print (random.randint(1,100)) # Picks a number between 1 and 100

# BINGO!

# By Jaseman - 24th April 2012

import random

n =0

while n != 13: # Keep looping till you get thirteen

n = random.randint(1,100)

print (n)

N/A

# STRING ARRAYS

# By Jaseman - 24th April 2012

mytext = ["I", "Love", "My","Raspberry","Pi"]

for n in range(0,5):

print (mytext[n])

print()

N/A

# BAT AND BALL

# By antiloquax - 28th April 2012

import pygame

from pygame.locals import *

pygame.init()

# set the width and height of the screen

size = [400, 400]

screen = pygame.display.set_mode(size)

# give the window a title

pygame.display.set_caption("Bat and Ball")

# This makes the normal mouse pointer invisible in graphics window

pygame.mouse.set_visible(0)

# create surfaces for the bat and ball

bat_surf = pygame.Surface((64,12))

bat_surf.fill((0,255,0))

batrect = bat_surf.get_rect()

ball_surf = pygame.Surface((30,30))

ballrect = ball_surf.get_rect()

ball = pygame.draw.circle(ball_surf, (0,0,255),[15, 15], 15)

# set speed of ball

speed = [3, 3]

# puts the bat centre of screen, near the bottom

batrect.center = ((size[0]/2), (size[1] - 50))

# make a text object

font = pygame.font.Font(None, 36)

text = font.render("Game Over", True, (255,0,0))

textRect = text.get_rect()

textRect.centerx = (size[0]/2)

textRect.centery = (size[1]/2)

# loop until the user clicks the close button

done=0

# create a timer to control how often the screen updates

clock = pygame.time.Clock()

# main game loop

while done == 0:

screen.fill((0,0,0))

# event handling

for event in pygame.event.get(): # if we click something ...

if event.type == pygame.QUIT: # if we click close ...

done=1 # this will cause the loop to finish.

# moves bat in accordance with the mouse position

position = pygame.mouse.get_pos()

batrect.centerx = position[0]

# move the ball

ballrect.left += speed[0]

ballrect.top += speed[1]

# collision detection

if ballrect.colliderect(batrect):

speed[1] = -speed[1]

# check if the ball is going off screen

if ballrect.left < 0 or ballrect.right > size[0]:

speed[0] = -speed[0]

if ballrect.top < 0:

speed[1] = -speed[1]

# print "Game Over" if the ball leaves screen

if ballrect.top > size[1]:

screen.blit(text, textRect)

pygame.display.flip()

pygame.time.wait(2000) # 2000 milliseconds pause

ballrect.top=0; ballrect.left=(size[0]/2) # reset the ball position

screen.blit(ball_surf, ballrect)

screen.blit(bat_surf, batrect)

# set the loop to 60 cycles per second

clock.tick(60)

# update the display

pygame.display.flip()

1.9.2a0

The Mag Pi Issue 1 En

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