Random Walk in Python Code

Forums: Code, Python, Programming
Email this Topic • Print this Page

I need to modify this code to show a random walk on a 10*10 matrix. The walker will move by one element at a time labeled A through Z by moving up,down,left or right. The walker can never go outside of the matrix either.

Please help, I have never looked at programming before and I am completely lost.

#You need to debug and modify the program so that it is able to do random walking
import random

N = 10
FILLER = '.'

#create a list to represent a row
#The row at first is filled with FILLER '.'
line = []
for i in range(N):
line.append(FILLER)

#create a matrix
#The matrix is the maze to walk
a=[]
for i in range(N):
line = line[:]
a.append(line)

#always starts at the left top corner of the matrix
#fill the matrix cell at the left top corner 'A'
x = 0
y = 0
letter = 'A'
a[x][y] = letter

#a sequence of random walk steps
#The below loop will settle the next letter
letter = chr(ord(letter) + 1)
#Where to go from the current sell: right, left, down, or up?
#We need a bit of randomness
direction = random.randrange(0, 4);
#keep track of the directions tried
moves_tried = 0 #trials to put a letter

#The following loop broken either due to
#running out of letters or
#having tried four directions
while (moves_tried < 4 and letter <= 'Z'):
#turn is random but its value is always between 0 and 3
turn = (direction + moves_tried) % 4
if (turn == 0): #right
new_x = x
new_y = y + 1
elif (turn == 1): #left
new_x = x
new_y = y - 1
elif (turn == 2): #down
new_x = x + 1
new_y = y
else: #up
new_x = x - 1
new_y = y
#check the new position (new_x, new_y) to see if the letter can be settled
if (0 <= new_x and new_x < N and 0 <= new_y and new_y < N and a[new_x][new_y] == FILLER):
#label the target element and prepare the next iteration

else:
moves_tried = moves_tried + 1
for i in range(N):
#use (' '.join(a)) to get a string
#print the ith row a of the matrix

Topic Stats
Top Replies
Link to this Topic

Type: Question • Score: 0 • Views: 2,407 • Replies: 1

No top replies

@Cbr600,

Code:



from random import choice



data = [[' ' for i in range(10)] for j in range(10)]

char, x, y, counter, data[x][y] = 66, 0, 0, 0, 'A'



while char < 91:

    xc, yc = x, y

    direction = choice((-1, 1))

    if choice((False, True)):

        x += direction

        if x == -1:

            x = 0

        if x == 10:

            x = 9

    else:

        y += direction

        if y == -1:

            y = 0

        if y == 10:

            y = 9

    if data[x][y] == ' ':

        data[x][y] = chr(char)

        char += 1

    else:

        x, y = xc, yc

        counter += 1

        if counter > 99999:

            print('Boxed in\n')

            break



for item in data:

    print(item)

input('\nPress the <ENTER> key to continue')

I realise this post is 7 years old, but with a liking for puzzles and an interest in python coding I had a crack at it

The python code posted above seems to do what is required when entered into my Python Launcher for Windows (Console)

There are two possible outputs

1. Something like this, when A to Z completes

Code:



['A', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

['B', 'C', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', 'D', 'E', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', ' ', 'F', 'G', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', 'J', 'I', 'H', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', 'K', 'N', 'O', 'P', ' ', 'Z', ' ', ' ', ' ']

[' ', 'L', 'M', 'R', 'Q', 'X', 'Y', ' ', ' ', ' ']

[' ', ' ', ' ', 'S', 'T', 'W', ' ', ' ', ' ', ' ']

[' ', ' ', ' ', ' ', 'U', 'V', ' ', ' ', ' ', ' ']

[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

2. Something like this, when a point is reached where there is nowhere to move

Code:



Boxed in



['A', 'B', 'C', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

['J', 'K', 'D', 'E', ' ', ' ', ' ', ' ', ' ', ' ']

['I', 'H', 'G', 'F', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']

0 Replies

Random Walk in Python Code

Related Topics

Quick Links

My Account

able2know