[Python-Dev] [Python-ideas] Proposed addtion to urllib.parse in 3.1 (and urlparse in 2.7)

Steven Bethard steven.bethard at gmail.com
Mon Apr 13 19:23:45 CEST 2009

On Mon, Apr 13, 2009 at 2:29 AM, Mart Sõmermaa <mrts.pydev at gmail.com> wrote:
> On Mon, Apr 13, 2009 at 12:56 AM, Antoine Pitrou <solipsis at pitrou.net>
> wrote:
>> Mart Sõmermaa <mrts.pydev <at> gmail.com> writes:
>> >
>> > Proposal: add add_query_params() for appending query parameters to an
>> > URL to
>> urllib.parse and urlparse.
>> Is there anything to /remove/ a query parameter?
> I'd say this is outside the scope of add_query_params().
> As for the duplicate handling, I've implemented a threefold strategy that
> should address all use cases raised before:
>  def add_query_params(*args, **kwargs):
>     """
>     add_query_parms(url, [allow_dups, [args_dict, [separator]]], **kwargs)
>     Appends query parameters to an URL and returns the result.
>     :param url: the URL to update, a string.
>     :param allow_dups: if
>         * True: plainly append new parameters, allowing all duplicates
>           (default),
>         * False: disallow duplicates in values and regroup keys so that
>           different values for the same key are adjacent,
>         * None: disallow duplicates in keys -- each key can have a single
>           value and later values override the value (like dict.update()).

Unnamed flag parameters are unfriendly to the reader. If I see something like:

  add_query_params(url, True, dict(a=b, c=d))

I can pretty much guess what the first and third arguments are, but I
have no clue for the second. Even if I have read the documentation
before, I may not remember whether the middle argument is "allow_dups"
or "keep_dups".


>     :param args_dict: optional dictionary of parameters, default is {}.
>     :param separator: either ';' or '&', the separator between key-value
>         pairs, default is '&'.
>     :param kwargs: parameters as keyword arguments.
>     :return: original URL with updated query parameters or the original URL
>         unchanged if no parameters given.
>     """
> The commit is
> http://github.com/mrts/qparams/blob/b9bdbec46bf919d142ff63e6b2b822b5d57b6f89/qparams.py
> extensive description of the behaviour is in the doctests.

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