Writing multi-dimensional list value to a file in Python

Question

Thanks for clearing up my confusions on my previous question of saving data from file to multidimensional list here

I look up through the Internet to do the reverse, saving multidimensional list to a file. But, I didn't get any lead to compute that. If its not too much, I would appreciate if you can suggest me how could I save a multidimensional list to a file.

The list is something like

['b',30.83,0,'u','g','w','v',1.25,'t','t',01,'f','g',00202,0,+]
['a',58.67,4.46,'u','g','q','h',3.04,'t','t',06,'f','g',00043,560,+]

The format needed to be saved in the file is

b,30.83,0,u,g,w,v,1.25,t,t,01,f,g,00202,0,+
a,58.67,4.46,u,g,q,h,3.04,t,t,06,f,g,00043,560,+

Thanks for your help!!!

Numbers like 00043 are automatically converted to integers, you should convert them to strings if you want to store them as is. — Ashwini Chaudhary
– Ashwini Chaudhary, Commented Jan 9, 2014 at 15:01
Most notably, 00043 == 35 in python2 and SyntaxError in python3. A leading zero indicates a octal number. — Jonas Schäfer
– Jonas Schäfer, Commented Jan 9, 2014 at 15:04

Ashwini Chaudhary · Accepted Answer · 2014-01-09 15:05:02Z

2

Use the csv module:

import csv
with open(filename, 'w') as f:
   writer = csv.writer(f, delimiter=',')
   writer.writerows(my_list)  #considering my_list is a list of lists.

edited Jan 9, 2014 at 15:05

answered Jan 9, 2014 at 14:58

Ashwini Chaudhary

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Scott Hunter · Accepted Answer · 2014-01-09 14:54:21Z

1

Join each list with "," & write as a line to your file.

answered Jan 9, 2014 at 14:54

Scott Hunter

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