newbie question(file-delete trailing comma)

[kavitha thankaian]

thanks,,,
   
  i tried another way and it works,,,
   
  f.writelines(','.join([('\"%s\"' % some[field]) for field in field_order]))

  thanks a lot,,,
   
  
Gabriel Genellina <gagsl-py2 at yahoo.com.ar> wrote:
  En Wed, 28 Feb 2007 08:34:29 -0300, kavitha thankaian 
escribió:

> thanks,,
> now i have one more problem,,,
> the strings should be seperated in an order,,,
> some={1:'a', 2:7, 3:'c', 4:'d'}
> i need the output to be a,c,d,7
> before my code was:
> field_order = [1,3,4,2]
> for field in field_order:
> f.writelines('\"%s\",' % someprt[field] )
> do you have an idea now how should it look like???

Proceed in small steps. First get the data you need to write, then, format 
them and build a single line, then write the new line onto the file.

some = {1:'a', 2:7, 3:'c', 4:'d'}
# i need the output to be a,c,d,7
field_order = [1,3,4,2]
row = []
for field in field_order:
row.append(some[field])
# row contains ['a', 'c', 'd', 7]
# convert to string
row = ['%s' % item for item in row]
### alternative: convert to string, with "" around each value
##row = ['"%s"' % item for item in row]
# make a single line, using "," as separator
line = ','.join(row)
# write to file
f.write('%s\n' % line)

-- 
Gabriel Genellina

-- 
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