[docs] Suggestion for documentation improvement

[Johannes Ammon]

Dear python developpers,

I ran into the unicode problem of the csv module in the python standard
library (2.7.5) and immediately found the solution in the docs. I just
used the UTF8Recoder/UnicodeReader/UnicodeWriter proposed in
http://docs.python.org/2/library/csv.html#examples. Thank you for that!

There is just one little problem with UnicodeWriter, which imho has an
easy solution:

class UnicodeWriter:
"..."
    def writerow(self, row):
        self.writer.writerow([s.encode("utf-8") for s in row])
        "..."

When "s" is not a string (i.e. when "row" contains an element, that is
e.g. None or an int, which is ok for csv.writer), I get a

"AttributeError: 'NoneType' object has no attribute 'encode'"

So I changed this bit of code to

    def writerow(self, row):
        self.writer.writerow([unicode(s).encode("utf-8") if s is not None
                              else "" for s in row])
        "..."

Ok, this is a bit complicated for an educational code sample, but I
think there are more people like me, that just use the code samples from
the docs.

Best regards, Johannes