Problems with extra blank line when using csv.writer in Python 3.1

[tkpmep at hotmail.com]

I’m experiencing a problem with the csv module in Python 3.1.2, and
would greatly appreciate any help anyone can offer me. When writing
csv files in Python 2.6, I open the output file as 'wb' to prevent a
blank line being inserted after every line. Works like a charm. But I
get an error if I do the same in 3.1; i.e if type the following
sequence of commands:
>>> import csv
>>> outfile = open('c:/temp/test.csv', 'wb')
>>> writer = csv.writer(outfile)
>>> line = [1, 2, 3, 4]
>>> writer.writerow(line)
Traceback (most recent call last):
  File "<pyshell#26>", line 1, in <module>
    writer.writerow(line)
TypeError: must be bytes or buffer, not str


Switching to
>>> outfile = open('c:/temp/test.csv', 'w')

makes it work, but I now have a blank line after each line when I open
the file using Excel. Any thoughts or guidance on what I ought to be
doing in 3.1 to fix the extra blank line problem?

Thank you in advance

Thomas Philips