Re: Get named groups from a regular expression
On 2014-07-01, Florian Lindner mailingli...@xgm.de wrote: Is there a way I can extract the named groups from a regular expression? e.g. given (?Ptestgrp\d) I want to get something like [testgrp]. The match object has an attribute called groupdict, so you can get the found named groups using match.groupdict.keys. I can't remember what happens to unnamed groups (I prefer to name every group I want), but ISTR that there is a list of capture groups in which the indexes are the capture groups number (i.e. what you'd use to backreference them). Can I make the match object to return default values for named groups, even if no match was produced? A lazy solution I've used was to write a default dict, then update it with the groupdict. I doubt that's all that efficient, but the defaults were constant strings and the program was network-bound anyway. -- https://mail.python.org/mailman/listinfo/python-list
Re: try/except/finally
On 2014-06-08, Dave Angel da...@davea.name wrote: Frank B fbick...@gmail.com Wrote in message: Ok; this is a bit esoteric. So finally is executed regardless of whether an exception occurs, so states the docs. But, I thought, if I return from my function first, that should take precedence. au contraire Turns out that if you do this: try: failingthing() except FailException: return 0 finally: return 1 Then finally really is executed regardless... even though you told it to return. That seems odd to me. The thing that's odd to me is that a return is permissible inside a finally block. That return should be at top level, even with the finally line. And of course something else should be in the body of the finally block. It does have some legitimate uses, for example: try: failingThing() finally: simple_cleanup() if(that_worked()) return complicated cleanup with lots of blocks OTOH, it could just be that Guido didn't think of banning it when exceptions were first added and doesn't want to introduce an incompatability later. -- https://mail.python.org/mailman/listinfo/python-list
Re: How to use SQLite (sqlite3) more efficiently
On 2014-06-06, Mark Lawrence breamore...@yahoo.co.uk wrote: On 06/06/2014 22:58, Dave Angel wrote: Chris Angelico ros...@gmail.com Wrote in message: On Sat, Jun 7, 2014 at 4:15 AM, R Johnson ps16thypresenceisfullnessof...@gmail.com wrote: The subject line isn't as important as a header, carried invisibly through, that says that you were replying to an existing post. :) Sorry for my ignorance, but I've never edited email headers before and didn't find any relevant help on Google. Could you please give some more details about how to do what you're referring to, or perhaps point me to a link that would explain more about it? (FYI, I read the Python mailing list on Google Groups, and reply to posts in Thunderbird, sending them to the Python-list email address.) The simple answer is: You don't have to edit headers at all. If you want something to be part of the same thread, you hit Reply and don't change the subject line. If you want something to be a spin-off thread, you hit Reply and *do* change the subject. If you want it to be a brand new thread, you don't hit Reply, you start a fresh message. Any decent mailer will do the work for you. Replying is more than just quoting a bunch of text and copying in the subject line with Re: at the beginning. :) set up a newsgroup in Thunderbird from gmane.comp.python.general. That doesn't sound right to me. Surely you set up the newgroup news.gmane.org and then subscribe to the mailing lists, blog feeds or whatever it is that you want? In usenet parlance, news.gmane.org is a newsserver, and gmane.comp.python.general is a newsgroup. gmane runs a series of mail-news gateways for several mailing lists, but there are others as well: someone also bridges the list to the group comp.lang.python, which is where I'm reading this. -- https://mail.python.org/mailman/listinfo/python-list
