Writting to specific location in a file

[artixan]

I have a database result set in a Python list. Each row is a tuple.
data = [(a_field,b_field,c_field,d_field,x_field,y_field,z _field)]

I need to loop thru this data and write each row to a text file.

f = open('out.txt','w')
for row in data:
f.writelines(row)
My chanllenge is that each field needs to have a exact specific
position in the output file.
For instance a_field needs to start at position 2 in the line, b_fields
at position 18 and so on, for all the fields on each line.
What is a way of approaching this problem. I was think of maybe
creating a Cheetah template file. Is there a simple way to go?

Can anyone point me to a possible way of doing this?
Thanks a lot,

Arnaldo

[Michael Hoffman]

ar*****@gmail.com wrote:

My chanllenge is that each field needs to have a exact specific
position in the output file.
For instance a_field needs to start at position 2 in the line, b_fields
at position 18 and so on, for all the fields on each line.

You can use string formatting operations:

row = ("a", "b")
print " %-16s%-16s" % row

http://docs.python.org/lib/typesseq-strings.html
--
Michael Hoffman