Re: [Python-Dev] More on Py3K urllib -- urlencode()

Dan Mahn Sat, 28 Feb 2009 16:24:53 -0800

Bill Janssen wrote:

Bill Janssen <jans...@parc.com> wrote:

Dan Mahn <dan.m...@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

Thanks. Generally, I would tend to agree. I actually tried something like that, but I found that I had inadvertently been sending numeric values, in which case the str() was saving me. Considering that, I would rather just see something like ...

k = quote_plus(k) if isinstance(k,(str,bytes)) else quote_plus(str(k))
if isinstance(v,(str,bytes)):
l.append(k + "=" + quote_plus(v))
else:
# just keep what's in the else

I think it would be more compatible with existing code calling urlencode(). Additionally, I think it would be nice to allow selection of the quote_plus() string encoding parameters, but that was one of the other points I listed.

A similar thing could be done when "not doseq", but the handling of "v" would be exactly like "k".

- Dan

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Re: [Python-Dev] More on Py3K urllib -- urlencode()

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