author | mikek |
Mon, 17 May 2010 18:37:02 +0100 | |
changeset 16 | ccc8ba7d117c |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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#!/usr/bin/python |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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""" turtle-example-suite: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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Initial QEMU (symbian-qemu-0.9.1-12) import
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xtx_lindenmayer_indian.py |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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Initial QEMU (symbian-qemu-0.9.1-12) import
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Each morning women in Tamil Nadu, in southern |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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7 |
India, place designs, created by using rice |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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flour and known as kolam on the thresholds of |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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their homes. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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These can be described by Lindenmayer systems, |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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which can easily be implemented with turtle |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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graphics and Python. |
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|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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Two examples are shown here: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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16 |
(1) the snake kolam |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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17 |
(2) anklets of Krishna |
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|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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19 |
Taken from Marcia Ascher: Mathematics |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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Elsewhere, An Exploration of Ideas Across |
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Cultures |
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|
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""" |
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24 |
################################ |
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# Mini Lindenmayer tool |
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26 |
############################### |
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27 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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from turtle import * |
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|
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def replace( seq, replacementRules, n ): |
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for i in range(n): |
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newseq = "" |
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for element in seq: |
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newseq = newseq + replacementRules.get(element,element) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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seq = newseq |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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return seq |
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37 |
|
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def draw( commands, rules ): |
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for b in commands: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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try: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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rules[b]() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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except TypeError: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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try: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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draw(rules[b], rules) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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except: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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pass |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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47 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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48 |
|
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def main(): |
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################################ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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# Example 1: Snake kolam |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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################################ |
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53 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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54 |
|
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def r(): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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right(45) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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57 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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def l(): |
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59 |
left(45) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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60 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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def f(): |
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62 |
forward(7.5) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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63 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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64 |
snake_rules = {"-":r, "+":l, "f":f, "b":"f+f+f--f--f+f+f"} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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snake_replacementRules = {"b": "b+f+b--f--b+f+b"} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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snake_start = "b--f--b--f" |
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|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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drawing = replace(snake_start, snake_replacementRules, 3) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
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reset() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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speed(3) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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72 |
tracer(1,0) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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ht() |
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up() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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backward(195) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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down() |
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draw(drawing, snake_rules) |
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78 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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from time import sleep |
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80 |
sleep(3) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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81 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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82 |
################################ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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83 |
# Example 2: Anklets of Krishna |
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84 |
################################ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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85 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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86 |
def A(): |
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87 |
color("red") |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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88 |
circle(10,90) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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89 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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90 |
def B(): |
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91 |
from math import sqrt |
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parents:
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92 |
color("black") |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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93 |
l = 5/sqrt(2) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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94 |
forward(l) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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95 |
circle(l, 270) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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96 |
forward(l) |
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parents:
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97 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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98 |
def F(): |
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parents:
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99 |
color("green") |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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100 |
forward(10) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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101 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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102 |
krishna_rules = {"a":A, "b":B, "f":F} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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103 |
krishna_replacementRules = {"a" : "afbfa", "b" : "afbfbfbfa" } |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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104 |
krishna_start = "fbfbfbfb" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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105 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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106 |
reset() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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107 |
speed(0) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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108 |
tracer(3,0) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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109 |
ht() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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110 |
left(45) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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111 |
drawing = replace(krishna_start, krishna_replacementRules, 3) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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112 |
draw(drawing, krishna_rules) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
113 |
tracer(1) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
114 |
return "Done!" |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
115 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
116 |
if __name__=='__main__': |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
117 |
msg = main() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
118 |
print msg |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
119 |
mainloop() |