URLPath should have an inverse to child() and here() isn't really here()

	magmatt reported
Trac ID	trac#6673
Type	enhancement
Created	2013-08-07 17:20:59Z
Branch	https://github.com/twisted/twisted/tree/url-up-here-6673

URLPath.parent is not the inverse of URLPath.child, which is unexpected:

>>> from twisted.python.urlpath import URLPath
>>> u = URLPath.fromString('http://example.com/foo/bar/baz')
>>> print u
http://example.com/foo/bar/baz
>>> print u.child('hey').parent()
http://example.com/foo/bar/

And I would expect URLPath.here() to be the way to get a URL without query parameters, but it's not:

>>> from twisted.python.urlpath import URLPath
>>> u = URLPath.fromString('http://example.com/foo/bar/baz?foo=1')
>>> print u
http://example.com/foo/bar/baz?foo=1
>>> print u.here()
http://example.com/foo/bar/

I propose adding two new methods that let you:

1. Perform the inverse of .child('foo')
2. Access the current url without query parameters.

(I apologize, but I just read in the docs that I should submit the ticket before writing a patch -- sorry)

Attachments:

• urlpath.patch (2334 bytes) - added by magmatt on 2013-08-07 17:21:08Z -
• 6673.2.patch (10622 bytes) - added by magmatt on 2013-09-19 16:14:00Z -

trac-id__6673 6673
type__enhancement enhancement
reporter__magmatt magmatt
priority__normal normal
milestone__ 
branch__branches_url_up_here_6673 branches/url-up-here-6673
branch_author__jonathanj jonathanj
status__new new
resolution__None None
component__core core
keywords__url url
time__1375896059000000 1375896059000000
changetime__1383471045000000 1383471045000000
version__None None
owner__ 

Start in twisted.python.urlpath.URLPath and review the examples showing the behavior of parent(), child(), and here(). Check the existing url-up-here-6673 branch and attached patches, then verify that the requested inverse operation and query-free current URL behavior are covered.