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Sat Mar 7 15:56:32 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-March/086884.html

After a harder look, I concluded there was a bit more work to be done, 
but still very basic modifications.

Attached is a version of urlencode() which seems to make the most sense 
to me.

I wonder how I could officially propose at least some of these 
modifications.

- Dan

Bill Janssen wrote:
> Bill Janssen <janssen at parc.com> wrote:
>
>   
>> Dan Mahn <dan.mahn at digidescorp.com> wrote:
>>
>>     
>>> 3) Regarding the following code fragment in urlencode():
>>>
>>>            k = quote_plus(str(k))
>>>           if isinstance(v, str):
>>>                v = quote_plus(v)
>>>                l.append(k + '=' + v)
>>>            elif isinstance(v, str):
>>>                # is there a reasonable way to convert to ASCII?
>>>                # encode generates a string, but "replace" or "ignore"
>>>                # lose information and "strict" can raise UnicodeError
>>>                v = quote_plus(v.encode("ASCII","replace"))
>>>                l.append(k + '=' + v)
>>>
>>> I don't understand how the "elif" section is invoked, as it uses the
>>> same condition as the "if" section.
>>>       
>> This looks like a 2->3 bug; clearly only the second branch should be
>> used in Py3K.  And that "replace" is also a bug; it should signal an
>> error on encoding failures.  It should probably catch UnicodeError and
>> explain the problem, which is that only Latin-1 values can be passed in
>> the query string.  So the encode() to "ASCII" is also a mistake; it
>> should be "ISO-8859-1", and the "replace" should be a "strict", I think.
>>     
>
> Sorry!  In 3.0.1, this whole thing boils down to
>
>    l.append(quote_plus(k) + '=' + quote_plus(v))
>
> Bill
>   
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[Python-Dev] More on Py3K urllib -- urlencode()