[Tutor] writing files using modules and functions

[Rufino Beniga]

def MatInv(arr,file):
    f = open('file.txt','w')
    f.write(arr)
    f.close()

So I'm trying to write a module that will take a matrix (arr) and write it
to a text file.
The above module is called MatrixIO.py

#first I import it

import MatrixIO

#Then i call the function MatInv with matrix(a) and file name (doc) as the
arguments
MatInv(a,doc)

It creates a file called txt and it shows only boxes. What am I doing wrong?
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