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> However, I was unable to reproduce your observation that
> doseq=0 results in urlencode not knowing how to handle
> unicode.
I had given urlencode a hebrew unicode string, and
"".encode() could not convert it to ascii:

s_unicode = u'\u05d1\u05d3\u05d9\u05e7\u05d4'
print urllib.urlencode({"key":s_unicode}, 0)

As I notice now, the line:
>> urllib.urlencode({"key":s_unicode}, 1)
key=%3F%3F%3F%3F%3F

does not raise an exception but produces an incorrect result.

The correct way to call it is like this:
>> urllib.urlencode({"key":s_unicode.encode("iso8859_8")}, 1)
key=%E1%E3%E9%F7%E4


So, in addition to your suggestion, I think the
documentation should explicitly state that unicode strings
will be treated as us-ascii.

What about my suggestion of an example for doseq's behaviour
in the docstring?