CherryPy for Python 3000

07/25/08

01:20:56 am, by fumanchu

, 243 words

Categories: Python, CherryPy

CherryPy for Python 3000

I'm categorically rejecting the 2to3 approach--for myself anyway. If you think it would help, feel free to:

"upgrade" CP to 2.6, which AFAICT means ensuring it will no longer work in 2.5 or previous versions
turn on the 3k warning
import-and-fix until you don't get any warnings
run-tests-and-fix until you don't get any warnings
run 2to3
import-and-fix until you don't get any errors
run-tests-and-fix until you don't get any errors
wait for bug reports

Me, I'd rather just drop cherrypy/ into 3k and skip steps 1-5.

Changes I had to make so far (http://www.cherrypy.org/changeset/2029):

(4) urlparse -> urllib.parse
(24) "except (ExcA, ExcB):" -> "except ExcA, ExcB:"
(30) "except ExcClass, x:" -> "except ExcClass as x"
(22) u"" -> ""
(1) BaseHTTPServer -> http.server
(1) rfc822 -> email.utils
(4) md5.new() -> hashlib.md5()
(3) sha.new() -> hashlib.sha1()
(3) urllib2 -> urllib
(28) StringIO -> io
(1) func.func_code -> func.code
(6) Cookie -> http.cookies
(3) ConfigParser -> configparser
(1) rfc822._monthnames -> email._parseaddr._monthnames
(105) print -> print()
(35) httplib -> http.client
(22) basestring -> (str, bytes)
(12) items() -> list(items())
(46) iteritems() -> items()
(11) Thread.get/setName -> get/set_name
(1) exec "" -> exec("")
(1) 0777 -> 0o777
(1) Queue -> queue
(1) urllib.unquote -> urllib.parse.unquote

At the moment, I'm a bit blocked importing wsgiserver--we had a nonblocking version of makefile that subclassed the old socket._fileobject class. Looks like the whole socket implementation has changed (and much of it pushed down into C). Not looking forward to reimplementing that.

Permalink 8 comments »

8 comments

Comment from: Benjamin Peterson [Visitor]

· http://pybites.blogspot.com

I would recommend you at least reinclude step 5. 80-90% of the items you listed can be fixed by 2to3.

07/25/08 @ 13:21

Comment from: John P. Speno [Visitor] · http://speno.blogspot.com

I enjoyed this post. Thanks!

07/26/08 @ 12:36

Comment from: fumanchu [Member]

Ha, John, I was looking for a link to a spam site when I read your comment. Good thing I know you. :) You're always welcome.

07/26/08 @ 13:46

Comment from: Nicolas Grilly [Visitor]

· http://blog.grilly.com

Thanks for this interesting post! I'm really happy to know you are updating CherryPy to Python 3.0.

07/27/08 @ 06:16

Comment from: Seun Osewa [Visitor]

Where can I get the Python 3000 compatible version of Cherrypy? Thanks in advance.

09/22/08 @ 18:10

Comment from: Nabil Stendardo [Visitor]

Hmmm,
According to me, subclassing concrete classes which aren't meant to be subclassed is an anti-pattern IMHO (especially implementation details starting with an underscore). Apart from that, where are you at with the implementation? Python 3.0 is definitely one of the cleanest languages, and I hope most current libraries and support software (such as easy-install) will update.

01/19/09 @ 13:51

Comment from: Arc Riley [Visitor]

· https://www.ohloh.net/accounts/ArcRiley

Any updates on this? WSGI now has py3k support, it'd be nice to be able to use it within a framework.

01/20/09 @ 15:50

Comment from: fumanchu [Member]

Py3k support in CP is one of my goals before PyCon 09. Feel free to join the effort.

01/20/09 @ 22:15

Comment feed for this post