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November 7th, 2003, 05:12 PM

xlordt

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join()

How do i use the string.join class with multydimentional arrays?

Code:

import string

matrix = [[1,2,3],[4,5,6],[7,8,9]]
join = string.join(matrix)
print join

November 7th, 2003, 10:26 PM

lazy_yogi

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join only operates on strings
http://www.python.org/doc/current/l...ng-methods.html

If you are trying to convert it to display the matrix as a string, try something like this

Code:

output = ""
for row in matrix:
    for element in row:
        output += str(element) + ' '
    if len(row) > 0: output = output[:-1]
    output += '\n'

November 8th, 2003, 02:34 AM

netytan

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For small lists of data this wouldn't be much of a problem but with HUGE lists this could be slow; because strings in Python are imutable the Python interpreter has to make copies of the strings when consinating them (string + string) and etc.

This should work better:

Code:

#!/usr/bin/env python

l = [[1,2,3],[4,5,6],[7,8,9]]
j = []

for s in l:
	for e in s:
		j.append(str(e))

print ''.join(j)

it only joins the data and doesnt display it in a matrix style like yogis does but you can do this is say.. one more line by appending a '\n' in there.

Mark.

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