🌐 Mailman 3 September 2016 - Python-list - python.org

more python3 regex?
by Doug OLeary Sept. 11, 2016

Sept. 11, 2016

Hey This one seems like it should be easy but I'm not getting the expected results. I have a chunk of data over which I can iterate line by line and print out the expected results: for l in q.findall(data): # if re.match(r'(Name|")', l): # continue print(l) $ ./testies.py | wc -l 197 I would like to skip any line that starts with 'Name' or a double quote: $ ./testies.py | perl -ne 'print if (m{^Name} || m{^"})' Name IP Address,Site, "",,7 of 64 Name,IP Address,Site, "",,,8 of 64 Name,IP Address,Site, "",,,9 of 64 Name,IP Address,Site, "",,,10 of 64 Name,IP Address,Site, "",,,11 of 64 Name IP Address,Site, $ ./testies.py | perl -ne 'print unless (m{^Name} || m{^"})' | wc -l 186 When I run with the two lines uncommented, *everything* gets skipped: $ ./testies.py $ Same thing when I use a pre-defined pattern object: skippers = re.compile(r'Name|"') for l in q.findall(data): if skippers.match(l): continue print(l) Like I said, this seems like it should be pretty straight forward so I'm obviously missing something basic. Any hints/tips/suggestions gratefully accepted. Doug O'Leary

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Re: How to split value where is comma ?
by Andrea D'Amore Sept. 11, 2016

Sept. 11, 2016

On 2016-09-08 09:27:20 +0000, Joaquin Alzola said: > Cannot do anything about it. It is not on my MTA client and it is added > by the company server :( > > If it depended on my I will remove it but I can not do that. > This email is confidential and may be subject to privilege. If you are > not the intended recipient, please do not copy or disclose its content > but contact the sender immediately upon receipt. At least use a signature (conventionally marked by double dash, space, newline) so the part that's automatically added by the mail system is clearly separated from the body of your message. -- Andrea

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Re: [Python-ideas] Inconsistencies (was: Shuffled)
by Lawrence D’Oliveiro Sept. 11, 2016

Sept. 11, 2016

On Sunday, September 11, 2016 at 1:00:47 AM UTC+12, Chris Angelico wrote: > > On Sat, Sep 10, 2016 at 10:09 PM, Sven R. Kunze wrote: >> You might have heard of: "There are no such things as facts, just opinions. > > Yes, I've heard that. It is false. It’s very easy to see why: start by asking whether the statement is a fact or an opinion. The conclusion follows logically from that.

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Re: [Python-ideas] Inconsistencies (was: Shuffled)
by Rustom Mody Sept. 11, 2016

Sept. 11, 2016

On Saturday, September 10, 2016 at 6:30:47 PM UTC+5:30, Chris Angelico wrote: > Redirecting to python-list as I don't believe this belongs on -ideas. > > On Sat, Sep 10, 2016 at 10:09 PM, Sven R. Kunze wrote: > > You might have heard of: "There are no such things as facts, just opinions. > > Everything, we see is a perspective not the truth." See below, why this > > applies here as well. > > Yes, I've heard that. It is false. > > Some things are absolute hard facts. There is no way in which 1 will > ever be greater than 2, ergo "1 is less than 2" is strictly true, and > not a matter of opinion. If you hear someone trying to claim > otherwise, would you let him have his opinion, or would you treat it > as incorrect? Just saw this [No its not exactly consistent with my earlier view!] “How much is 2 and 2?” Everyone gave the answer except the accountant. When everyone left, he dimmed the light and whispered in my ear “How much do you want?”

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generator function - Called and accepts XML attributes- Python 3.5
by Sayth Renshaw Sept. 11, 2016

Sept. 11, 2016

Hi I want to create a generator function that supplies my calling function a file, how though do I get the generator to accept attributes in the argument when called? This works not as a generator for filename in sorted(file_list): with open(dir_path + filename) as fd: doc = xmltodict.parse(fd.read()) for item in doc['meeting']['race']: for detail in item['nomination']: print(item['@id'] + "\t" + detail['@id'] + "\t" + detail['@number'] + "\t" + detail['@horse']) And what I want to do is simplify for detail in item['nomination']: print(item['@id'] + "\t" + detail['@id'] + "\t" + detail['@number'] + "\t" + detail['@horse']) As I will have several implementations to do and would like to be able to neatly handoff to sqlalchemy. I have it as something like this but am not quite creating it correctly. def return_files(file_list): """ Take a list of files and return file when called Calling function to supply attributes """ for filename in sorted(file_list, *attribs): with open(dir_path + filename) as fd: doc = xmltodict.parse(fd.read()) for item in doc([attribs]): yield item Thanks Sayth

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Re: generator function - Called and accepts XML attributes- Python 3.5
by Sayth Renshaw Sept. 11, 2016

Sept. 11, 2016

> The way I'm reading your code, it's not the generator that's the > difference here. Consider these lines: > > > for item in doc['meeting']['race']: > > > > def return_files(file_list): > > for filename in sorted(file_list, *attribs): > > for item in doc([attribs]): > > Firstly, did you mean for *attribs to be part of the signature of > return_files? As it is, it's being given to sorted(), which won't work > (the other args to sorted are keyword-only). > > Assuming that to be the case, what you're trying to do is subscript an > object with a variable set of attributes: > > return_files(files, "meeting", "race') > > That can best be done with a little loop: > > def return_files(file_list, *attribs): > ... > for attr in attribs: > doc = doc[attr] > for item in doc: > > If that's not what you want, can you further clarify the question? > > ChrisA Thanks ChrisA, what I am wanting to do is to create a generator for my file input to only pull the file when the last has processed. Then have my separate functions to process the files as required as each will have different attribute combinations and processing. My thinking is that having been reading SQLAlchemy I will be creating the models to represent the tables and the relationships. Therefore if I had 3 tables for name and people attributes, another for location(meeting) details and a central table for event details, then if the generator pulls a file I can parse it with each function. Each function would update the model and then call back to the generator for another file. My concern is that as some process in each table will be longish it is better to keep that separate and just call them from a main function. Maybe the generator should just stop at parsing the file at the root XML level so that each calling function can then hook up from its node. Is that clear or a massive brain dump? Sayth

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Re: collect2: ld returned 1 exit status when building from source
by Steve D'Aprano Sept. 10, 2016

Sept. 10, 2016

On Sun, 11 Sep 2016 03:34 am, Zachary Ware wrote: > On Sep 10, 2016 09:56, "Steve D'Aprano" <steve+python(a)pearwood.info> > wrote: >> >> I'm trying to build from source using: >> >> ./configure --with-pydebug && make -s -j2 [...] >> Any suggestions for fixing this? > > Try make distclean, then configure and build again. Same error. > If that fails, try > another make distclean, then configure, do 'make touch', then build again. make touch fails. [steve@ando cpython]$ make touch cd .; \ hg --config extensions.touch=Tools/hg/hgtouch.py touch -v *** failed to import extension touch from Tools/hg/hgtouch.py: invalid syntax (hgtouch.py, line 22) hg: unknown command 'touch' Mercurial Distributed SCM basic commands: add add the specified files on the next commit [...] view start interactive history viewer use "hg help" for the full list of commands or "hg -v" for details make: *** [touch] Error 255 And *that* error is because the hgtouch.py uses `with`, which fails because my hg runs under Python 2.4. -- Steve “Cheer up,” they said, “things could be worse.” So I cheered up, and sure enough, things got worse.

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collect2: ld returned 1 exit status when building from source
by Steve D'Aprano Sept. 10, 2016

Sept. 10, 2016

I'm trying to build from source using: ./configure --with-pydebug && make -s -j2 At first the output is okay, then I get a whole heap of similar errors: Python/dtrace_stubs.o: In function `PyDTrace_LINE': /home/steve/python/python-dev/cpython/Include/pydtrace.h:25: multiple definition of `PyDTrace_LINE' Python/ceval.o:/home/steve/python/python-dev/cpython/Include/pydtrace.h:25: first defined here Python/dtrace_stubs.o: In function `PyDTrace_FUNCTION_ENTRY': /home/steve/python/python-dev/cpython/Include/pydtrace.h:26: multiple definition of `PyDTrace_FUNCTION_ENTRY' Python/ceval.o:/home/steve/python/python-dev/cpython/Include/pydtrace.h:26: first defined here [ ... many, many, many more PyDTrace_* multiple definitions ... ] collect2: ld returned 1 exit status make: *** [Programs/_freeze_importlib] Error 1 Any suggestions for fixing this? -- Steve “Cheer up,” they said, “things could be worse.” So I cheered up, and sure enough, things got worse.

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Re: [Python-ideas] Inconsistencies (was: Shuffled)
by Rustom Mody Sept. 10, 2016

Sept. 10, 2016

On Saturday, September 10, 2016 at 6:30:47 PM UTC+5:30, Chris Angelico wrote: > Redirecting to python-list as I don't believe this belongs on -ideas. > > On Sat, Sep 10, 2016 at 10:09 PM, Sven R. Kunze wrote: > >> On 08.09.2016 04:00, Steven D'Aprano wrote: > >> > >> On Wed, Sep 07, 2016 at 11:43:59PM +0200, Sven R. Kunze wrote: > >> > >>> BUT experienced devs also need to recognize and respect the fact that > >>> younger/unexperienced developers are just better in detecting > >>> inconsistencies and bloody work-arounds. > >> > >> That is not a fact. It is the opposite of a fact > >> > > > > You might have heard of: "There are no such things as facts, just opinions. > > Everything, we see is a perspective not the truth." See below, why this > > applies here as well. > > Yes, I've heard that. It is false. > > Some things are absolute hard facts. There is no way in which 1 will > ever be greater than 2, ergo "1 is less than 2" is strictly true, and > not a matter of opinion. If you hear someone trying to claim > otherwise, would you let him have his opinion, or would you treat it > as incorrect? You are confusing analytic and synthetic truths, an old philosophic distinction with a new special place in CS http://blog.languager.org/2015/07/cs-history-2.html Analytic truths have a tautologous feel that makes them sound strangely irrelevant (as an observation) eg. “What is is” “Something is the case or is not the case” More informally: “Time is irreversible” “We all die” etc All true but nothing is communicated by saying it Mathematical truths like 1 < 2 are in the same category as “triangles are 3-sided figures” same as “triangles are triangular” True... and tautologus When people commonly talk of ‘facts’ they are typically synthetic Acceleration due to gravity is 9.8 m/s² Planets move in elliptic orbits round the sun All these *scientific* truths as Karl Popper pointed out are scientific exactly BECAUSE they are falsifiable. Unlike say: “God created the world” And to say that they are falsifiable is exactly what Sven is saying: They are the dominant opinion of the scientific establishment And will change when the fashions change As for shuffle vs shuffled I am very much in the shuffled camp. It irks me that - sort and sorted are named backwards — should have been dosort and sort - tuples are less 1st class than lists (why no tuple comprehensions?) - what you get from writing a comprehension inside a {} is a set not a frozenset - set and frozenset are named backwards; should have been mutableset and set - there are no frozendicts (though dict comprehensions are niftier in python than in most functional languages - etc etc Which I guess you can summarize as (me saying that) functional programming is natural and imperative programming is a stone-age relic. [And BTW in the other thread in which the closeness or not of asyncio, threads, processes is being debated it is so clear to those who have seen radically different paradigms like Erlang that the problem is not the specifics of async/threads/processes but the general situation that python is stuck in imperative-land ]

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python3 regex?
by dkoleary＠olearycomputers.com Sept. 10, 2016

Sept. 10, 2016

Hey; Long term perl ahderent finally making the leap to python. From my reading, python, for the most part, uses perl regex.. except, I can't seem to make it work... I have a txt file from which I can grab specific titles via a perl one-liner: $ perl -ne 'print if (m{^("?)[1-9]*\.})' tables 1. ${title1} 2. ${title2} "3. ${title3}",,, 4. one more title 5. nuther title 6. and so on...,, ... 25. last title I can't seem to get the same titles to appear using python: $ python -V Python 3.5.2 $ python Python 3.5.2 (default, Jul 5 2016, 12:43:10) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import os >>> import re >>> with open('tables','rt') as f: data = f.read() printing data results in the output I would expect.. Trying to compile a regex and display the results does not show the same results I get from perl. >>> regex = r'^("?)[1-9]*\.' >>> re.search(regex, data) >>> >>> p = re.compile(r'^("?)[1-9]*\.') >>> p re.compile('^("?)[1-9]*\\.') >>> p.findall(data) I've tried any number of options shown on the net all with the same result. Can someone point out what I'm messing up? Thanks Doug

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