[issue45874] urllib.parse.parse_qsl does not parse empty query string with strict parsing

[Andrew Svetlov]

Andrew Svetlov  added the comment:


New changeset e6fe10d34096a23be7d26271cf6aba429313b01d by Christian Sattler in 
branch 'main':
bpo-45874: Handle empty query string correctly in urllib.parse.parse_qsl 
(#29716)
https://github.com/python/cpython/commit/e6fe10d34096a23be7d26271cf6aba429313b01d


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nosy: +asvetlov

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[issue45874] urllib.parse.parse_qsl does not parse empty query string with strict parsing

[Roundup Robot]

Change by Roundup Robot :


--
keywords: +patch
nosy: +python-dev
nosy_count: 1.0 -> 2.0
pull_requests: +27952
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/29716

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[issue45874] urllib.parse.parse_qsl does not parse empty query string with strict parsing

[Christian Sattler]

New submission from Christian Sattler :

Calling
  urllib.parse.parse_qsl('', strict_parsing=True)
yields an error:
  ValueError: bad query field: ''

The empty string '' is produced by
  urllib.parse.urlencode({})
and also as query string by
  urllib.parse.urlsplit('http://example.org/')
so it should be accepted by urllib.parse.parse_qsl with strict parsing. 

The problem is that parse_qsl(qs, ...) cannot distinguish between zero and one 
query arguments. The call to qs.split(separator) returns the non-empty list 
[''] for qs empty, which means one query argument. However, in this case, we 
want the other semantics.

--
components: Library (Lib)
messages: 406807
nosy: sattler
priority: normal
severity: normal
status: open
title: urllib.parse.parse_qsl does not parse empty query string with strict 
parsing
type: behavior
versions: Python 3.10

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