ANN: gcc-python-plugin 0.13
gcc-python-plugin is a plugin for GCC 4.6 onwards which embeds the CPython interpreter within GCC, allowing you to write new compiler warnings in Python, generate code visualizations, etc. It ships with gcc-with-cpychecker, which implements static analysis passes for GCC aimed at finding bugs in CPython extensions. In particular, it can automatically detect reference-counting errors: http://gcc-python-plugin.readthedocs.org/en/latest/cpychecker.html The major features in this release are: * gcc 4.9 compatibility * a major revamping to the HTML output from gcc-with-cpychecker More detailed information on these and details of the other changes can be seen in the release notes at: http://gcc-python-plugin.readthedocs.org/en/latest/0.13.html Tarball releases are available at: https://fedorahosted.org/releases/g/c/gcc-python-plugin/ Prebuilt-documentation can be seen at: http://gcc-python-plugin.readthedocs.org/en/latest/index.html The project's homepage is: https://fedorahosted.org/gcc-python-plugin/ The plugin and checker are Free Software, licensed under the GPLv3 or later. Thanks to Buck Golemon, Denis Efremov, Philip Herron, and Tom Tromey for their contributions to this release. Enjoy! Dave Malcolm -- https://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: how to parse standard algebraic notation
On Tuesday, 30 September 2014 23:15:24 UTC+2, Gary Herron wrote: On 09/30/2014 01:53 PM, math math wrote: Hi, I am trying to learn Python while solving exercises. I want to basically write a program that inputs a polynomial in standard algebraic notation and outputs its derivative. I know that I need to get the exponent somehow, but I am not sure how to accomplish this in python (3.3) Do you have any ideas or suggestions? I don't want to use existing modules as this is meant to be a didactic experience. Regards This depends on things you have not yet told us. In particular -- what standard algebraic notation? For x-squared: x**2 ? or perhaps x^2 ? or something else like some Unicode characters or HTML to get a small superscript 2 above an x. Once you give an example of what your input looks like, we can start hashing out how to read it. Gary Herron -- Dr. Gary Herron Department of Computer Science DigiPen Institute of Technology (425) 895-4418 Thanks Gary (and Chris), I should have sent a sample expression indeed. What would be a good starting strategy for writing a program to take the derivative of a polynomial expression, such as this below?: x**3 + x**2 + x + 1 I am a bit confused about my overall strategy. Should one be writing a parser class to split the input on operators and then on the double asterisks? Are there more clever ways? Or is this something one should solve using mathematical formulas instead of parsing the characters? I just wonder how a seasoned Pythonian would go about a problem like this without using a ready-made derivative function from some module. Regards, Felix -- https://mail.python.org/mailman/listinfo/python-list
Re: Python code in presentations
On Tuesday, 30 September 2014 12:51:00 UTC+1, Jean-Michel Pichavant wrote: I'm currently writing a presentation to help my co-workers ramp up on new features of our tool (written in python (2.7)). I have some difficulties presenting code in an efficient way (with some basic syntax highlights). I need to be catchy about the code I'm presenting otherwise the presentation will fail and I would be better saying to my co-workers RTFM, cause there is a manual. A good option is to use reStructuredText and the rst2s5 converter (http://docutils.sourceforge.net/docs/user/slide-shows.html). It can do syntax highlighting of python, and produces a slide show you display in a browser. An example of what you can produce is at http://farmdev.com/talks/unicode. Glenn -- https://mail.python.org/mailman/listinfo/python-list
Re: how to parse standard algebraic notation
On 01/10/2014 08:01, math math wrote: [mega-snip] You are far more likely to get answers if you access this list via https://mail.python.org/mailman/listinfo/python-list or read and action this https://wiki.python.org/moin/GoogleGroupsPython to prevent us seeing double line spacing and single line paragraphs, thanks. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
Thoughts on python classes to represent an ebook reader
Hi, I hope there are people here with strong OOP experience. Which classes would an object-oriented python programmer create for the design of a e-book reader for example? I am not really interested in the code, just the OOP classes that would come to one's mind for a task like this. It should allow users to buy new e-books, view their list of purchased books and read the books. I have made an attempt of class diagram here http://imgur.com/9TR2Tlm; but I would be really glad to hear other opinions. I have not used any inheritance for example. I didn't know exactly where it would be handy and I also dont know if these classes are theoretically a good basis at all... Thanks a lot for comments/feedback. Felix -- https://mail.python.org/mailman/listinfo/python-list
Re: Weird SSL problem
30 sep 2014 kl. 00:55 skrev Ned Deily n...@acm.org: In article cd8f39d9-acd9-4d6e-9aac-dbcdf607f...@adm.umu.se, Roland Hedberg roland.hedb...@adm.umu.se wrote: Hi! I¹m trying to access https://stsadweb.one.microsoft.com/adfs/.well-known/openid-configuration Doing it the simplest way I get the following: import urllib f = urllib.urlopen(https://stsadweb.one.microsoft.com/adfs/.well-known/openid -configuration) Traceback (most recent call last): File stdin, line 1, in module File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py, line 87, in urlopen return opener.open(url) File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py, line 208, in open return getattr(self, name)(url) File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py, line 437, in open_https h.endheaders(data) File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py , line 969, in endheaders self._send_output(message_body) File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py , line 829, in _send_output self.send(msg) File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py , line 791, in send self.connect() File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py , line 1176, in connect self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file) File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py, line 387, in wrap_socket ciphers=ciphers) File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py, line 143, in __init__ self.do_handshake() File /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py, line 305, in do_handshake self._sslobj.do_handshake() IOError: [Errno socket error] [Errno 54] Connection reset by peer import ssl ssl.OPENSSL_VERSION ¹OpenSSL 0.9.8za 5 Jun 2014' Now, using Safari, or curl for that matter, from the same machine works without a hitch. The URL above is also the only URL I¹ve encountered this problem with. Anyone got an idea ? I believe the problem is that the connection is protected by a multi-hostname server certificate and Python 2's urllib (and underlying httplib and ssl modules) do not support SNI extensions to TLS. The request above works fine with Python 3 (which has supported client-side SNI since Python 3.2). See http://bugs.python.org/issue5639 for more discussion of the matter. If Python 3 is not an option for you, the requests package available via PyPI should help. You’re absolutely correct in that it’s a SNI problem. Python 3 is not an option and I was already using requests obviously missing something. Ah, had to install some extra libraries. — Roland ”Being able to think like a child is an important attribute of being an adult” - Eddie Izzard -- https://mail.python.org/mailman/listinfo/python-list
Re: how to parse standard algebraic notation
On Wed, Oct 1, 2014 at 5:01 PM, math math mathemati...@gmail.com wrote: What would be a good starting strategy for writing a program to take the derivative of a polynomial expression, such as this below?: x**3 + x**2 + x + 1 I am a bit confused about my overall strategy. Should one be writing a parser class to split the input on operators and then on the double asterisks? Are there more clever ways? Or is this something one should solve using mathematical formulas instead of parsing the characters? I just wonder how a seasoned Pythonian would go about a problem like this without using a ready-made derivative function from some module. Well, let's see. Are you planning to use exact Python syntax everywhere? For instance, will you use asterisks for multiplication (5*x**3 + 2*x**2 - 5*x + 1)? If so, you could make use of the ast.parse() module to do some of the work for you. Otherwise, you'll have to start by writing up a grammar: exactly what is and isn't allowed? Then write a parser, and see how things go from there. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Thoughts on python classes to represent an ebook reader
On 01.10.2014 10:14, math math wrote: Hi, I hope there are people here with strong OOP experience. Which classes would an object-oriented python programmer create for the design of a e-book reader for example? I am not really interested in the code, just the OOP classes that would come to one's mind for a task like this. It should allow users to buy new e-books, view their list of purchased books and read the books. I have made an attempt of class diagram here http://imgur.com/9TR2Tlm; but I would be really glad to hear other opinions. I have not used any inheritance for example. I didn't know exactly where it would be handy and I also dont know if these classes are theoretically a good basis at all... Thanks a lot for comments/feedback. Felix As it happens, the very popular Calibre ebook software is written in Python. So, I guess, getting (https://github.com/kovidgoyal/calibre) and looking at its source code should give you a good start. Wolfgang -- https://mail.python.org/mailman/listinfo/python-list
Re: SNI support in python 2.7 for Locust load tests
Hi, Reddy writes: ... I'm trying to use locust (http://locust.io/) to run load test of one site we're developing. Everything was running nice and smooth until we switch the servers to use SNI. SNI is not officially supported in python 2.7.5 you have two options: Python 2.7.9 implements PEP 466 Network Security Enhancements for Python 2.7.x including TLS 1.1, 1.2 and SNI support. 2.7.9 will be released shortly. You could try the 2.7 branch from hg.python.org. Use PyOpenSSL instead of Python's ssl module. It supports SNI, too. A recent post in this list regarding missing SNI support in Python 2.x got as a suggestion to use the backports.ssl package on PyPI. Thanks Christian and Dieter for your prompt responses! I tried yesterday with Python built from https://hg.python.org/cpython/archive/9b4673d7b046.tar.gz. I also do use pyOpenSSL as described at http://stackoverflow.com/a/19477363 so I used pip to install pyOpenSSL, ndg-httpsclient and pyasn1 as well as patched locust startup file with the following: from urllib3.contrib import pyopenssl pyopenssl.inject_into_urllib3() I also tried adding the following: from functools import partial ssl.wrap_socket = partial(ssl.wrap_socket, ssl_version=ssl.PROTOCOL_TLSv1) Finally, I've just tried with: /usr/local/bin/pip2.7 install backports.ssl and patching the lucust file with: import backports.ssl as ssl import backports.ssl.monkey as monkey import requests monkey.patch() I've also added verify=False to my locust test scripts to disable certificate verification according to http://docs.locust.io/en/latest/api.html ...And I still get exactly the same error: [2014-09-30 14:19:41,793] ip-x-x-x-x/ERROR/stderr: File build/bdist.linux-x86_64/egg/OpenSSL/SSL.py, line 977, in sendall [2014-09-30 14:19:41,793] ip-x-x-x-x/ERROR/stderr: File build/bdist.linux-x86_64/egg/OpenSSL/SSL.py, line 849, in _raise_ssl_error [2014-09-30 14:19:41,794] ip-x-x-x-x/ERROR/stderr: OpenSSL.SSL [2014-09-30 14:19:41,794] ip-x-x-x-x/ERROR/stderr: . [2014-09-30 14:19:41,794] ip-x-x-x-x/ERROR/stderr: WantWriteError Now I'm starting to think it's something else than SNI, but all those scripts were working nice before and the only change done was turning on the SNI on tested servers... Any idea what my actually cause this WantWriteError? -- https://mail.python.org/mailman/listinfo/python-list
Re: Python code in presentations
Right now the method I'm using is write the code in notepad++, use a plugin (NppExport) to copy paste code into powerpoint. After using it a little bit, I'm really not satisfied with this method, it's expensive and all this copy paste stuff is driving me crazy. Not to mention that the syntax highlight from notepads renders like crap in powerpoint. I wonder if some people in this list who have successfully presented python code have some tips about doing the proper way. Ned's presentations for pycons are to me one example of successful code presentation: - the layout is simple - the code and code output are clearly identified - a line of code can be highlighted while presenting LyX and Beamer. Sincerely, Wolfgang -- https://mail.python.org/mailman/listinfo/python-list
How to show a dictionary sorted on a value within its data?
I have a dictionary as follows:-
{
u'StarterAmps1': Row(id=4, ain=u'AIN3', name=u'StarterAmps1',
conv=6834.374834509803, Description=u'Starter Amps'),
u'LeisureVolts': Row(id=1, ain=u'AIN0', name=u'LeisureVolts',
conv=29.01374215995874, Description=u'Leisure Volts'),
u'RudderPos': Row(id=6, ain=u'AIN5', name=u'RudderPos', conv=0.028125,
Description=u'Rudder Position'),
u'xx': Row(id=7, ain=u'AIN6', name=u'xx', conv=0.028125, Description=u''),
u'LeisureAmps1': Row(id=3, ain=u'AIN2', name=u'LeisureAmps1',
conv=32.727273081945, Description=u'Leisure Amps'),
u'StarterVolts': Row(id=2, ain=u'AIN1', name=u'StarterVolts',
conv=28.94469628911757, Description=u'Starter Volts')
}
I want to output a menu to a user comprising some parts of the
dictionary (ain and Description) sorted by ain.
Is there some incantation of sorted() that will do what I want? I
can't quite fathom out the 'key=' parameter needed to sort it by the
tuple item. Maybe I need a cmp= ?
E.g. I want to do something like:-
for meas in sorted(adc.cfg, key=???):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
What's needed in the ???
--
Chris Green
·
--
https://mail.python.org/mailman/listinfo/python-list
Re: JSON-encoding very long iterators
On Monday, September 29, 2014 7:10:18 PM UTC-7, Ian wrote: This would cause things that aren't lists to be encoded as lists. Sometimes that may be desirable, but in general if e.g. a file object sneaks its way into your JSON encode call, it is more likely correct to raise an error than to silently encode the file as if it were a list of strings. So it should not be the default behavior. That said, it sounds like it could be made easier to enable streaming from iterators as an option for those cases where it's desired. I added a stream flag (off by default) and also added file streaming (thanks for the idea). https://github.com/Zectbumo/cpython/compare/2.7 What do you think now? -- https://mail.python.org/mailman/listinfo/python-list
Re: How to show a dictionary sorted on a value within its data?
c...@isbd.net wrote:
I have a dictionary as follows:-
{
u'StarterAmps1': Row(id=4, ain=u'AIN3', name=u'StarterAmps1',
conv=6834.374834509803, Description=u'Starter Amps'), u'LeisureVolts':
Row(id=1, ain=u'AIN0', name=u'LeisureVolts', conv=29.01374215995874,
Description=u'Leisure Volts'), u'RudderPos': Row(id=6, ain=u'AIN5',
name=u'RudderPos', conv=0.028125, Description=u'Rudder Position'), u'xx':
Row(id=7, ain=u'AIN6', name=u'xx', conv=0.028125, Description=u''),
u'LeisureAmps1': Row(id=3, ain=u'AIN2', name=u'LeisureAmps1',
conv=32.727273081945, Description=u'Leisure Amps'), u'StarterVolts':
Row(id=2, ain=u'AIN1', name=u'StarterVolts', conv=28.94469628911757,
Description=u'Starter Volts') }
I want to output a menu to a user comprising some parts of the
dictionary (ain and Description) sorted by ain.
Is there some incantation of sorted() that will do what I want? I
can't quite fathom out the 'key=' parameter needed to sort it by the
tuple item. Maybe I need a cmp= ?
E.g. I want to do something like:-
for meas in sorted(adc.cfg, key=???):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
What's needed in the ???
for meas in sorted(adc.cfg, key=lambda key: adc.cfg[key].ain):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
or simpler
for row in sorted(adc.cfg.values(), key=operator.attrgetter(ain))
print(row.ain, row.Description)
or even
for row in sorted(
map(operator.attrgetter(ain, Description), adc.cfg.values())):
print(*row)
--
https://mail.python.org/mailman/listinfo/python-list
Re: How to show a dictionary sorted on a value within its data?
On 01/10/2014 10:58, c...@isbd.net wrote:
I have a dictionary as follows:-
{
u'StarterAmps1': Row(id=4, ain=u'AIN3', name=u'StarterAmps1',
conv=6834.374834509803, Description=u'Starter Amps'),
u'LeisureVolts': Row(id=1, ain=u'AIN0', name=u'LeisureVolts',
conv=29.01374215995874, Description=u'Leisure Volts'),
u'RudderPos': Row(id=6, ain=u'AIN5', name=u'RudderPos', conv=0.028125,
Description=u'Rudder Position'),
u'xx': Row(id=7, ain=u'AIN6', name=u'xx', conv=0.028125, Description=u''),
u'LeisureAmps1': Row(id=3, ain=u'AIN2', name=u'LeisureAmps1',
conv=32.727273081945, Description=u'Leisure Amps'),
u'StarterVolts': Row(id=2, ain=u'AIN1', name=u'StarterVolts',
conv=28.94469628911757, Description=u'Starter Volts')
}
I want to output a menu to a user comprising some parts of the
dictionary (ain and Description) sorted by ain.
Is there some incantation of sorted() that will do what I want? I
can't quite fathom out the 'key=' parameter needed to sort it by the
tuple item. Maybe I need a cmp= ?
E.g. I want to do something like:-
for meas in sorted(adc.cfg, key=???):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
What's needed in the ???
IIRC one method involves using itemgetter from
https://docs.python.org/3/library/operator.html#module-operator
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
--
https://mail.python.org/mailman/listinfo/python-list
Re: How to show a dictionary sorted on a value within its data?
On Wed, Oct 1, 2014 at 5:58 AM, c...@isbd.net wrote:
I have a dictionary as follows:-
{
u'StarterAmps1': Row(id=4, ain=u'AIN3', name=u'StarterAmps1',
conv=6834.374834509803, Description=u'Starter Amps'),
u'LeisureVolts': Row(id=1, ain=u'AIN0', name=u'LeisureVolts',
conv=29.01374215995874, Description=u'Leisure Volts'),
u'RudderPos': Row(id=6, ain=u'AIN5', name=u'RudderPos', conv=0.028125,
Description=u'Rudder Position'),
u'xx': Row(id=7, ain=u'AIN6', name=u'xx', conv=0.028125, Description=u''),
u'LeisureAmps1': Row(id=3, ain=u'AIN2', name=u'LeisureAmps1',
conv=32.727273081945, Description=u'Leisure Amps'),
u'StarterVolts': Row(id=2, ain=u'AIN1', name=u'StarterVolts',
conv=28.94469628911757, Description=u'Starter Volts')
}
Is Row a function? Or do you have a key with a tuple as the value?
I want to output a menu to a user comprising some parts of the
dictionary (ain and Description) sorted by ain.
Is there some incantation of sorted() that will do what I want? I
can't quite fathom out the 'key=' parameter needed to sort it by the
tuple item. Maybe I need a cmp= ?
E.g. I want to do something like:-
for meas in sorted(adc.cfg, key=???):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
What's needed in the ???
--
Chris Green
·
You might read here:
http://www.pythoncentral.io/how-to-sort-python-dictionaries-by-key-or-value/
--
https://mail.python.org/mailman/listinfo/python-list
--
Joel Goldstick
http://joelgoldstick.com
--
https://mail.python.org/mailman/listinfo/python-list
Re: How to show a dictionary sorted on a value within its data?
Peter Otten __pete...@web.de wrote:
c...@isbd.net wrote:
I have a dictionary as follows:-
{
u'StarterAmps1': Row(id=4, ain=u'AIN3', name=u'StarterAmps1',
conv=6834.374834509803, Description=u'Starter Amps'), u'LeisureVolts':
Row(id=1, ain=u'AIN0', name=u'LeisureVolts', conv=29.01374215995874,
Description=u'Leisure Volts'), u'RudderPos': Row(id=6, ain=u'AIN5',
name=u'RudderPos', conv=0.028125, Description=u'Rudder Position'), u'xx':
Row(id=7, ain=u'AIN6', name=u'xx', conv=0.028125, Description=u''),
u'LeisureAmps1': Row(id=3, ain=u'AIN2', name=u'LeisureAmps1',
conv=32.727273081945, Description=u'Leisure Amps'), u'StarterVolts':
Row(id=2, ain=u'AIN1', name=u'StarterVolts', conv=28.94469628911757,
Description=u'Starter Volts') }
I want to output a menu to a user comprising some parts of the
dictionary (ain and Description) sorted by ain.
Is there some incantation of sorted() that will do what I want? I
can't quite fathom out the 'key=' parameter needed to sort it by the
tuple item. Maybe I need a cmp= ?
E.g. I want to do something like:-
for meas in sorted(adc.cfg, key=???):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
What's needed in the ???
for meas in sorted(adc.cfg, key=lambda key: adc.cfg[key].ain):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
Brilliant, worked perfectly, thank you. The bit I didn't understamd was
that 'lambda' bit, but I just looked it up and I'm a bit clearer now.
or simpler
for row in sorted(adc.cfg.values(), key=operator.attrgetter(ain))
print(row.ain, row.Description)
I tried this, I got:-
Traceback (most recent call last):
File /home/chris/bin/calibrate.py, line 24, in module
for meas in sorted(adc.cfg.values,
key=operator.attrgetter(ain)):
NameError: name 'operator' is not defined
I must admit that it's the bits like 'operator' in the parameters that
I can't really understand where they come from.
or even
for row in sorted(
map(operator.attrgetter(ain, Description), adc.cfg.values())):
print(*row)
--
Chris Green
·
--
https://mail.python.org/mailman/listinfo/python-list
Re: How to show a dictionary sorted on a value within its data?
On Wed, Oct 1, 2014 at 6:45 AM, c...@isbd.net wrote:
Peter Otten __pete...@web.de wrote:
c...@isbd.net wrote:
I have a dictionary as follows:-
{
u'StarterAmps1': Row(id=4, ain=u'AIN3', name=u'StarterAmps1',
conv=6834.374834509803, Description=u'Starter Amps'), u'LeisureVolts':
Row(id=1, ain=u'AIN0', name=u'LeisureVolts', conv=29.01374215995874,
Description=u'Leisure Volts'), u'RudderPos': Row(id=6, ain=u'AIN5',
name=u'RudderPos', conv=0.028125, Description=u'Rudder Position'), u'xx':
Row(id=7, ain=u'AIN6', name=u'xx', conv=0.028125, Description=u''),
u'LeisureAmps1': Row(id=3, ain=u'AIN2', name=u'LeisureAmps1',
conv=32.727273081945, Description=u'Leisure Amps'), u'StarterVolts':
Row(id=2, ain=u'AIN1', name=u'StarterVolts', conv=28.94469628911757,
Description=u'Starter Volts') }
I want to output a menu to a user comprising some parts of the
dictionary (ain and Description) sorted by ain.
Is there some incantation of sorted() that will do what I want? I
can't quite fathom out the 'key=' parameter needed to sort it by the
tuple item. Maybe I need a cmp= ?
E.g. I want to do something like:-
for meas in sorted(adc.cfg, key=???):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
What's needed in the ???
for meas in sorted(adc.cfg, key=lambda key: adc.cfg[key].ain):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
Brilliant, worked perfectly, thank you. The bit I didn't understamd was
that 'lambda' bit, but I just looked it up and I'm a bit clearer now.
or simpler
for row in sorted(adc.cfg.values(), key=operator.attrgetter(ain))
print(row.ain, row.Description)
I tried this, I got:-
Traceback (most recent call last):
File /home/chris/bin/calibrate.py, line 24, in module
for meas in sorted(adc.cfg.values,
key=operator.attrgetter(ain)):
NameError: name 'operator' is not defined
I must admit that it's the bits like 'operator' in the parameters that
I can't really understand where they come from.
operator is a module. See
https://docs.python.org/2/library/operator.html#module-operator
or even
for row in sorted(
map(operator.attrgetter(ain, Description), adc.cfg.values())):
print(*row)
--
Chris Green
·
--
https://mail.python.org/mailman/listinfo/python-list
--
Joel Goldstick
http://joelgoldstick.com
--
https://mail.python.org/mailman/listinfo/python-list
Re: How to show a dictionary sorted on a value within its data?
c...@isbd.net wrote:
Peter Otten __pete...@web.de wrote:
c...@isbd.net wrote:
I have a dictionary as follows:-
{
u'StarterAmps1': Row(id=4, ain=u'AIN3', name=u'StarterAmps1',
conv=6834.374834509803, Description=u'Starter Amps'), u'LeisureVolts':
Row(id=1, ain=u'AIN0', name=u'LeisureVolts', conv=29.01374215995874,
Description=u'Leisure Volts'), u'RudderPos': Row(id=6, ain=u'AIN5',
name=u'RudderPos', conv=0.028125, Description=u'Rudder Position'),
u'xx': Row(id=7, ain=u'AIN6', name=u'xx', conv=0.028125,
Description=u''), u'LeisureAmps1': Row(id=3, ain=u'AIN2',
name=u'LeisureAmps1', conv=32.727273081945, Description=u'Leisure
Amps'), u'StarterVolts': Row(id=2, ain=u'AIN1', name=u'StarterVolts',
conv=28.94469628911757, Description=u'Starter Volts') }
I want to output a menu to a user comprising some parts of the
dictionary (ain and Description) sorted by ain.
Is there some incantation of sorted() that will do what I want? I
can't quite fathom out the 'key=' parameter needed to sort it by the
tuple item. Maybe I need a cmp= ?
E.g. I want to do something like:-
for meas in sorted(adc.cfg, key=???):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
What's needed in the ???
for meas in sorted(adc.cfg, key=lambda key: adc.cfg[key].ain):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
Brilliant, worked perfectly, thank you. The bit I didn't understamd was
that 'lambda' bit, but I just looked it up and I'm a bit clearer now.
`lambda` is just a fancy way to define a function inline. With a normal
`def` it would be
def get_ain(key):
return adc.cfg[key].ain
or meas in sorted(adc.cfg, key=get_ain):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
or simpler
for row in sorted(adc.cfg.values(), key=operator.attrgetter(ain))
print(row.ain, row.Description)
I tried this, I got:-
Traceback (most recent call last):
File /home/chris/bin/calibrate.py, line 24, in module
for meas in sorted(adc.cfg.values,
key=operator.attrgetter(ain)):
NameError: name 'operator' is not defined
I must admit that it's the bits like 'operator' in the parameters that
I can't really understand where they come from.
As Joel says, operator is a module. To use it add
import operator
at the beginning of your module. To check if you've really understood the
lambda you can try to replace the operator.attrgetter(ain) in
for row in sorted(adc.cfg.values(), key=operator.attrgetter(ain)):
with
for row in sorted(adc.cfg.values(), key=lambda ...):
or even
for row in sorted(
map(operator.attrgetter(ain, Description),
adc.cfg.values())):
print(*row)
--
https://mail.python.org/mailman/listinfo/python-list
Re: SNI support in python 2.7 for Locust load tests
Hi, Reddy writes: ... I'm trying to use locust (http://locust.io/) to run load test of one site we're developing. Everything was running nice and smooth until we switch the servers to use SNI. SNI is not officially supported in python 2.7.5 you have two options: Python 2.7.9 implements PEP 466 Network Security Enhancements for Python 2.7.x including TLS 1.1, 1.2 and SNI support. 2.7.9 will be released shortly. You could try the 2.7 branch from hg.python.org. Use PyOpenSSL instead of Python's ssl module. It supports SNI, too. A recent post in this list regarding missing SNI support in Python 2.x got as a suggestion to use the backports.ssl package on PyPI. Thanks Christian and Dieter for your prompt responses! I tried yesterday with Python built from https://hg.python.org/cpython/archive/9b4673d7b046.tar.gz. I also do use pyOpenSSL as described at http://stackoverflow.com/a/19477363 so I used pip to install pyOpenSSL, ndg-httpsclient and pyasn1 as well as patched locust startup file with the following: from urllib3.contrib import pyopenssl pyopenssl.inject_into_urllib3() I also tried adding the following: from functools import partial ssl.wrap_socket = partial(ssl.wrap_socket, ssl_version=ssl.PROTOCOL_TLSv1) Finally, I've just tried with: /usr/local/bin/pip2.7 install backports.ssl and patching the lucust file with: import backports.ssl as ssl import backports.ssl.monkey as monkey import requests monkey.patch() I've also added verify=False to my locust test scripts to disable certificate verification according to http://docs.locust.io/en/latest/api.html ...And I still get exactly the same error: [2014-09-30 14:19:41,793] ip-x-x-x-x/ERROR/stderr: File build/bdist.linux-x86_64/egg/OpenSSL/SSL.py, line 977, in sendall [2014-09-30 14:19:41,793] ip-x-x-x-x/ERROR/stderr: File build/bdist.linux-x86_64/egg/OpenSSL/SSL.py, line 849, in _raise_ssl_error [2014-09-30 14:19:41,794] ip-x-x-x-x/ERROR/stderr: OpenSSL.SSL [2014-09-30 14:19:41,794] ip-x-x-x-x/ERROR/stderr: . [2014-09-30 14:19:41,794] ip-x-x-x-x/ERROR/stderr: WantWriteError Now I'm starting to think it's something else than SNI, but all those scripts were working nice before and the only change done was turning on the SNI on tested servers... Any idea what my actually cause this WantWriteError? -- I think I have a clue what's wrong. By default using: /usr/local/bin/pip2.7 install pyOpenSSL ndg-httpsclient pyasn1 gives me pyOpenSSL version 0.14. When I downgrade it to 0.13 with /usr/local/bin/pip2.7 install pyOpenSSL==0.13 everything works nice and smooth. Interestingly, on my local Ubuntu I do have 0.14 version of that package and it works well there... I noticed that dowgrading it to 0.13 buids 'OpenSSL.crypto' extension and that does not happen when installing v. 0.14 so I guess there's simply a connection to openssl missing somehow there in 0.14. According to https://github.com/pyca/pyopenssl/releases there was a big change there: Second, pyOpenSSL is no longer implemented in C as a collection of extension modules using the Python/C API. Instead, pyOpenSSL is now a pure-Python project with a dependency on a new project, http://github.com/pyca/cryptography, which provides (among other things) a cffi-based interface to OpenSSL. but I also have the most recent version of cryptography (0.6) installed there. And again - it works on local Ubuntu. Weird. I guess I'll just stick to pyOpenSSL==0.13 for the time being, unless somebody gives me a hint what I'm doing wrong with 0.14 :) Br, Reddy -- https://mail.python.org/mailman/listinfo/python-list
Re: Python 3.4.1 installer on Mac links Python to old Tcl/Tk
Ned Deily n...@acm.org wrote in message news:nad-d2ddcb.14070824062...@news.gmane.org... The easiest option would be a downloadable package that would allow the default python.org 8.5-linked _tkinter to be overridden with an 8.6 version. There may be some news on that front in the near future. It's October... So I tried Python 3.4.2rc1 and it seems that it still links to Tk 8.5 on Mac. Does it mean that there is no plan to link to Tk 8.6 in Python 3.4.2 on Mac? Or is there something that can override 8.5 to 8.6 as you wrote? In the meantime I tried MacPorts. It has Tk 8.6.1 so rotating text work well, but it has still a problem with semi-transparency as described here: http://core.tcl.tk/tk/tktview?name=99b84e49ff It has been fixed in Tk 8.6.2 that is already published for nearly a month, but there seems to be no uypdate on macports yet... So I am quite frustrated that I am not able to make my Python installation on Mac do the same things (namely roatting text and use png files that have semi-transparent pixels) both on Windows and Mac. Best regards Peter -- https://mail.python.org/mailman/listinfo/python-list
Re: how to parse standard algebraic notation
Thanks a lot, I will give this a shot. -- https://mail.python.org/mailman/listinfo/python-list
Re: How to show a dictionary sorted on a value within its data?
Joel Goldstick joel.goldst...@gmail.com wrote:
On Wed, Oct 1, 2014 at 6:45 AM, c...@isbd.net wrote:
Peter Otten __pete...@web.de wrote:
c...@isbd.net wrote:
I have a dictionary as follows:-
{
u'StarterAmps1': Row(id=4, ain=u'AIN3', name=u'StarterAmps1',
conv=6834.374834509803, Description=u'Starter Amps'), u'LeisureVolts':
Row(id=1, ain=u'AIN0', name=u'LeisureVolts', conv=29.01374215995874,
Description=u'Leisure Volts'), u'RudderPos': Row(id=6, ain=u'AIN5',
name=u'RudderPos', conv=0.028125, Description=u'Rudder Position'), u'xx':
Row(id=7, ain=u'AIN6', name=u'xx', conv=0.028125, Description=u''),
u'LeisureAmps1': Row(id=3, ain=u'AIN2', name=u'LeisureAmps1',
conv=32.727273081945, Description=u'Leisure Amps'), u'StarterVolts':
Row(id=2, ain=u'AIN1', name=u'StarterVolts', conv=28.94469628911757,
Description=u'Starter Volts') }
I want to output a menu to a user comprising some parts of the
dictionary (ain and Description) sorted by ain.
Is there some incantation of sorted() that will do what I want? I
can't quite fathom out the 'key=' parameter needed to sort it by the
tuple item. Maybe I need a cmp= ?
E.g. I want to do something like:-
for meas in sorted(adc.cfg, key=???):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
What's needed in the ???
for meas in sorted(adc.cfg, key=lambda key: adc.cfg[key].ain):
print(adc.cfg[meas].ain, adc.cfg[meas].Description)
Brilliant, worked perfectly, thank you. The bit I didn't understamd was
that 'lambda' bit, but I just looked it up and I'm a bit clearer now.
or simpler
for row in sorted(adc.cfg.values(), key=operator.attrgetter(ain))
print(row.ain, row.Description)
I tried this, I got:-
Traceback (most recent call last):
File /home/chris/bin/calibrate.py, line 24, in module
for meas in sorted(adc.cfg.values,
key=operator.attrgetter(ain)):
NameError: name 'operator' is not defined
I must admit that it's the bits like 'operator' in the parameters that
I can't really understand where they come from.
operator is a module. See
https://docs.python.org/2/library/operator.html#module-operator
Ah, OK, as it sort of might be a keyword I hadn't thought of that. :-)
--
Chris Green
·
--
https://mail.python.org/mailman/listinfo/python-list
Re: how to parse standard algebraic notation
On 01/10/2014 09:01, math math wrote: What would be a good starting strategy for writing a program to take the derivative of a polynomial expression, such as this below?: x**3 + x**2 + x + 1 You can look at sympy: from sympy import * equation = simplify(x**3 + x**2 + x + 1) equation x**3 + x**2 + x + 1 diff(equation) 3*x**2 + 2*x + 1 -- Marco Buttu INAF-Osservatorio Astronomico di Cagliari Via della Scienza n. 5, 09047 Selargius (CA) Phone: 070 711 80 217 Email: mbu...@oa-cagliari.inaf.it -- https://mail.python.org/mailman/listinfo/python-list
Re: how to parse standard algebraic notation
On 01/10/2014 09:01, math math wrote: What would be a good starting strategy for writing a program to take the derivative of a polynomial expression, such as this below?: x**3 + x**2 + x + 1 You can look at sympy: from sympy import * equation = simplify(x**3 + x**2 + x + 1) equation x**3 + x**2 + x + 1 diff(equation) 3*x**2 + 2*x + 1 -- Marco Buttu -- https://mail.python.org/mailman/listinfo/python-list
Re: How to show a dictionary sorted on a value within its data?
Joel Goldstick joel.goldst...@gmail.com wrote:
On Wed, Oct 1, 2014 at 5:58 AM, c...@isbd.net wrote:
I have a dictionary as follows:-
{
u'StarterAmps1': Row(id=4, ain=u'AIN3', name=u'StarterAmps1',
conv=6834.374834509803,
Description=u'Starter Amps'),
u'LeisureVolts': Row(id=1, ain=u'AIN0', name=u'LeisureVolts',
conv=29.01374215995874,
Description=u'Leisure Volts'),
u'RudderPos': Row(id=6, ain=u'AIN5', name=u'RudderPos', conv=0.028125,
Description=u'Rudder Position'),
u'xx': Row(id=7, ain=u'AIN6', name=u'xx', conv=0.028125, Description=u''),
u'LeisureAmps1': Row(id=3, ain=u'AIN2', name=u'LeisureAmps1',
conv=32.727273081945,
Description=u'Leisure Amps'),
u'StarterVolts': Row(id=2, ain=u'AIN1', name=u'StarterVolts',
conv=28.94469628911757,
Description=u'Starter Volts')
}
Is Row a function? Or do you have a key with a tuple as the value?
Row is a namedtuple, the dictionary is extracted from a database with
a row factory so the namedtuple names are the column names. It means
that if I change a column name then most things continue to work
without any code changes, and also I can refer to items in the tuple
by name of course.
I have the answer to my question in other responses.
--
Chris Green
·
--
https://mail.python.org/mailman/listinfo/python-list
Re: JSON-encoding very long iterators
On Wed, Oct 1, 2014 at 8:13 PM, Alfred Morgan alf...@54.org wrote: I added a stream flag (off by default) and also added file streaming (thanks for the idea). https://github.com/Zectbumo/cpython/compare/2.7 What do you think now? I think that you're adding features to Python 2.7, which isn't getting new features. That won't be merged into trunk. Does your patch apply to 3.x? ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Restarting Python
Terry Reedy wrote: Python does not have 'commands'. Terry, even experienced Python developers sometimes describe functions and statements as commands, e.g. Use the print command to display results. I think we can cut a beginner like Seymore a bit of slack for misusing terminology. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: Python 3.4.1 installer on Mac links Python to old Tcl/Tk
On 10/1/14, 7:51 AM, Peter Tomcsanyi wrote: Ned Deily n...@acm.org wrote in message news:nad-d2ddcb.14070824062...@news.gmane.org... The easiest option would be a downloadable package that would allow the default python.org 8.5-linked _tkinter to be overridden with an 8.6 version. There may be some news on that front in the near future. It's October... So I tried Python 3.4.2rc1 and it seems that it still links to Tk 8.5 on Mac. Does it mean that there is no plan to link to Tk 8.6 in Python 3.4.2 on Mac? Or is there something that can override 8.5 to 8.6 as you wrote? The solution here is to build Python and Tcl/Tk yourself, in the versions you want, and then things should work just fine. -- Kevin Walzer Code by Kevin/Mobile Code by Kevin http://www.codebykevin.com http://www.wtmobilesoftware.com -- https://mail.python.org/mailman/listinfo/python-list
Re: Restarting Python
On Wednesday, October 1, 2014 6:39:11 PM UTC+5:30, Steven D'Aprano wrote: Terry Reedy wrote: Python does not have 'commands'. Terry, even experienced Python developers sometimes describe functions and statements as commands, e.g. Use the print command to display results. I think we can cut a beginner like Seymore a bit of slack for misusing terminology. Agreed in general. However in this case I wonder... Do you even understand what is being requested? -- https://mail.python.org/mailman/listinfo/python-list
Re: Keepin constants, configuration values, etc. in Python - dedicated module or what?
Chris Angelico wrote: I'd agree, where trivial limits is defined by each individual item. Going with straight Python code is fine for huge projects with long config files, as long as each config entry is itself simple. You even get a form of #include: from otherfile import *. I would argue the opposite. If I have a large Python project, with big config files, then the added complexity of moving the config data into separate files using a non-executable format (say, JSON or INI) is minimal, and keeping the data and code separate will pay off. But for small Python projects, with only a few data values, keeping them separate is overkill. So, to the Original Poster, I think that depending on the size of your program and the amount of config data you have to deal with, there's nothing wrong with including it directly in the module. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: Restarting Python
Seymore4Head wrote: Since the developers of Python decided to make Python 3 non backward compatible, I can't help but wonder why they don't think a command to restart would be a useful addition? Possibly because it isn't a useful addition? Or maybe they just never thought of it. But more likely the first. Why doesn't Microsoft Office have a Restart Office command? Or Outlook? Or Notepad? Normally to restart anything, with the exception of the operating system, you exit/quit, then start again. Inside the interactive interpreter, I can restart the interpreter with four keystrokes: - Ctrl-D - UP-ARROW - ENTER Ctrl-D exits Python and returns me to the shell, UP-ARROW fetches the previous command (python), and ENTER runs that command. On Windows, I *think* you have to type Ctrl-Z ENTER instead of Ctrl-D, so that will be five keystrokes. Either way, that's significantly faster and simpler than using a restart function, say: - type restart() - ENTER (twelve keystrokes). Even if restarting is a little harder: - type quit() - press ENTER - click Start Menu Programs Python Python33.exe it's still not very hard in the big picture. So having a restart command would be of very little benefit in the interactive interpreter. (I don't say *no* benefit.) But it's actually a quite hard thing to do, restarting a process from within itself. It can obviously be done, since I've seen programs like Firefox do it, but I'm not sure how to write such a function. I think that something like this might do the job: - grab the current process ID; - start a daemon process which monitors that process ID; - exit; - when the daemon process sees that process ID is no longer alive, start up the application again; but that glosses over a number of painful difficulties. What if the parent terminal is no longer running? What about environment variables and command line arguments? What happens if you are running over a remote shell like ssh, and the link is terminated as soon as the Python process ends? So automatically restart would be a lot of work, it would quite likely be fragile and easily broken, and the benefit would be minimal. But it gets worse... because restart() would also be available when running non-interactive programs. And it isn't even clear what that should do, let alone how to do it. Consider a program like this: import sys x = 42 sys.exit() print(Hello World) That prints nothing, because exit() stops the program from running any further. But what if we replace the exit() with a restart()? What would you expect it to do? If you expect it to restart, then continue on by printing Hello World, then the Python interpreter would have to be completely redesigned from scratch. All that work, just as a convenience for restarting, is not worth it. I note that this sort of system can actually be justified. During the Apollo program, the landing module's computer was designed to restart when it ran out of memory and continue on with the current calculation that had been interrupted: https://www.hq.nasa.gov/alsj/a11/a11.1201-pa.html During the eight minutes that it took for the Eagle to land on the moon, the computer restarted at least five times, including three times in one 40 second period. http://www.doneyles.com/LM/Tales.html But Python is a long way from a Lunar Lander, and a restart() command would be a lot of effort for not much benefit. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: Keepin constants, configuration values, etc. in Python - dedicated module or what?
On Thu, Oct 2, 2014 at 12:49 AM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Chris Angelico wrote: I'd agree, where trivial limits is defined by each individual item. Going with straight Python code is fine for huge projects with long config files, as long as each config entry is itself simple. You even get a form of #include: from otherfile import *. I would argue the opposite. Welcome to design debates, where there are as many valid and justifiable views as there are participants :) Though I wasn't precluding small config files from being code - just saying that I don't think size of project is a factor at all. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Clearing globals in CPython
Out of curiosity, I ran: globals().clear() in the interactive interpreter. It broke much more than I expected! Built-ins were no longer available, and import stopped working. I expected that global variables would be all lost, but built-ins would remain, since they don't live in the global namespace. I was wrong: globals().clear() x = len([]) Traceback (most recent call last): File stdin, line 1, in module NameError: name 'len' is not defined The reason, I think, is that CPython has a special __builtins__ global variable that the interpreter uses to access built-in functions. What *appears* to be happening is that if that __builtins__ global is missing, CPython can not access the built-ins. (Supporting this interpretation: IronPython, like CPython, has a __builtins__ global, and behaves the same when the globals() are cleared. Jython, which does not have a __builtins__ global, does not.) Well that's okay, I thought to myself, I'll just import the built-in functions: from builtins import len # use '__builtin__' in Python 2 Traceback (most recent call last): File stdin, line 1, in module ImportError: __import__ not found Oops. So, with no built-ins available, import no longer works. That makes things rather tricky. Obviously the easiest way to recover is to exit the current session and restart it, but as a challenge, can we recover from this state? -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: Clearing globals in CPython
On Thu, Oct 2, 2014 at 2:00 AM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Obviously the easiest way to recover is to exit the current session and restart it, but as a challenge, can we recover from this state? Oooh interesting. This is kinda like breaking out of a sandbox, and I know there are people here who are experts at that. However... I'm not entirely sure how to get a backtrace, when you don't have any built-in exceptions! In Python 2, I can define an old-style class and raise that. However, with the removal of __builtins__, Python throws a bunch of errors about restricted mode, so I'm really not sure where to go from there. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Python code in presentations
- Original Message - From: Wolfgang Keller felip...@gmx.net To: python-list@python.org Sent: Wednesday, 1 October, 2014 11:42:34 AM Subject: Re: Python code in presentations Right now the method I'm using is write the code in notepad++, use a plugin (NppExport) to copy paste code into powerpoint. After using it a little bit, I'm really not satisfied with this method, it's expensive and all this copy paste stuff is driving me crazy. Not to mention that the syntax highlight from notepads renders like crap in powerpoint. I wonder if some people in this list who have successfully presented python code have some tips about doing the proper way. Ned's presentations for pycons are to me one example of successful code presentation: - the layout is simple - the code and code output are clearly identified - a line of code can be highlighted while presenting LyX and Beamer. Sincerely, Wolfgang Thank you all for all your great suggestions. I think I now have all I need. JM -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. -- https://mail.python.org/mailman/listinfo/python-list
Re: how to parse standard algebraic notation
math math wrote:
Hi,
I am trying to learn Python while solving exercises.
I want to basically write a program that inputs a polynomial in standard
algebraic notation and outputs its derivative.
I know that I need to get the exponent somehow, but I am not sure how to
accomplish this in python (3.3)
Do you have any ideas or suggestions? I don't want to use existing modules
as this is meant to be a didactic experience.
Code for evaluating mathematical expressions are very common, if you google
for expression parser I am sure you will find many examples. Don't limit
yourself to Python code, you can learn from code written in other languages
too, e.g. I have a Pascal programming book that develops a parser for both
polynomials and arithmetic expression. The code is fairly long, but quite
straightforward to translate into Python (and Pascal code is quite
readable.)
Look at an standard infix expression, using ^ for powers:
4*x^3 + x^2 - 5*x + 1
There are four terms:
4*x^3
x^2
-5*x
1
So if you replace - with +- and then split on +, you will get terms:
py expr = 4*x^3 + x^2 - 5*x + 1
py terms = expr.replace(-, +-).split(+)
py terms
['4*x^3 ', ' x^2 ', '- 5*x ', ' 1']
Strip spaces from each term:
py terms = [s.replace(' ', '') for s in terms]
py terms
['4*x^3', 'x^2', '-5*x', '1']
Unfortunately, terms can include optional parts. The coefficient is
optional, and may be just a minus sign; the power is optional. To make
processing easier, we can do this:
term = term.replace('-x', '-1*x')
if term.startswith('x'):
term = term.replace('x', '1*x')
if term.endswith('x'):
term = term.replace('x', 'x^1')
to each term, which will give us something like:
['4*x^3', '1*x^2', '-5*x^1', '1']
If a term is all digits (with an optional leading minus sign) then it is the
constant term. Otherwise, it will be of the form:
[optional minus sign][one or more digits]*x^[one or more digits]
which can now be easily parsed by splitting it up around the *, x or ^
symbols. Or use a regular expression.
--
Steven
--
https://mail.python.org/mailman/listinfo/python-list
Re: how to parse standard algebraic notation
On Thu, Oct 2, 2014 at 2:45 AM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Code for evaluating mathematical expressions are very common, if you google for expression parser I am sure you will find many examples. Don't limit yourself to Python code, you can learn from code written in other languages too, e.g. I have a Pascal programming book that develops a parser for both polynomials and arithmetic expression. Building expression evaluators is good fun! And then you can add specialty terms, like dice rolling. roll 2d6 + d6 Electric + 12 Strength [ROLL] Rosuav rolls 2d6: 3, 6, totalling 9. [ROLL] Rosuav rolls d6: 1 (Electric) [ROLL] Rosuav adds a bonus of 12 (Strength) [ROLL] For 2d6 + d6 Electric + 12 Strength, Rosuav totals: 22 The code behind that follows a fairly similar pattern to what you describe, only it deals with dice rolls (NdM - roll N dice with M sides each) instead of powers of x. (And it allows comments/tags.) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Clearing globals in CPython
On Wed, Oct 1, 2014 at 9:14 AM, Chris Angelico ros...@gmail.com wrote: On Thu, Oct 2, 2014 at 2:00 AM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Obviously the easiest way to recover is to exit the current session and restart it, but as a challenge, can we recover from this state? Oooh interesting. This is kinda like breaking out of a sandbox, and I know there are people here who are experts at that. However... I'm not entirely sure how to get a backtrace, when you don't have any built-in exceptions! In Python 2, I can define an old-style class and raise that. However, with the removal of __builtins__, Python throws a bunch of errors about restricted mode, so I'm really not sure where to go from there. I've played with it a bit, and I haven't found any way to break it yet. I have discovered that you cannot directly declare classes, although you can access the type built-in (indirectly) so it might be possible to indirectly declare a class. It is also possible to access the types of many of the built-ins (str, bytes, dict, set, type, object, frame, function, code, generator, int, float at a minimum). Note that I've been playing with Python 3.4.1. -- https://mail.python.org/mailman/listinfo/python-list
Re: Clearing globals in CPython
Steven D'Aprano wrote: Out of curiosity, I ran: globals().clear() in the interactive interpreter. It broke much more than I expected! Built-ins were no longer available, and import stopped working. I expected that global variables would be all lost, but built-ins would remain, since they don't live in the global namespace. I was wrong: globals().clear() x = len([]) Traceback (most recent call last): File stdin, line 1, in module NameError: name 'len' is not defined The reason, I think, is that CPython has a special __builtins__ global variable that the interpreter uses to access built-in functions. What *appears* to be happening is that if that __builtins__ global is missing, CPython can not access the built-ins. (Supporting this interpretation: IronPython, like CPython, has a __builtins__ global, and behaves the same when the globals() are cleared. Jython, which does not have a __builtins__ global, does not.) Well that's okay, I thought to myself, I'll just import the built-in functions: from builtins import len # use '__builtin__' in Python 2 Traceback (most recent call last): File stdin, line 1, in module ImportError: __import__ not found Oops. So, with no built-ins available, import no longer works. That makes things rather tricky. Obviously the easiest way to recover is to exit the current session and restart it, but as a challenge, can we recover from this state? $ python3 Python 3.4.0 (default, Apr 11 2014, 13:05:11) [GCC 4.8.2] on linux Type help, copyright, credits or license for more information. globals().clear() import that Traceback (most recent call last): File stdin, line 1, in module ImportError: __import__ not found object = 1 .__class__.__bases__[0] Quitter = [c for c in object.__subclasses__() if c.__name__ == Quitter][0] __builtins__ = Quitter.__call__.__globals__[__builtins__] import this The Zen of Python, by Tim Peters Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense. Readability counts. Special cases aren't special enough to break the rules. Although practicality beats purity. Errors should never pass silently. Unless explicitly silenced. In the face of ambiguity, refuse the temptation to guess. There should be one-- and preferably only one --obvious way to do it. Although that way may not be obvious at first unless you're Dutch. Now is better than never. Although never is often better than *right* now. If the implementation is hard to explain, it's a bad idea. If the implementation is easy to explain, it may be a good idea. Namespaces are one honking great idea -- let's do more of those! -- https://mail.python.org/mailman/listinfo/python-list
Re: Python 3.4.1 installer on Mac links Python to old Tcl/Tk
In article m0gps5$4r5$1...@ger.gmane.org, Peter Tomcsanyi tomcsa...@slovanet.sk wrote: Ned Deily n...@acm.org wrote in message news:nad-d2ddcb.14070824062...@news.gmane.org... It's October... So I tried Python 3.4.2rc1 and it seems that it still links to Tk 8.5 on Mac. Does it mean that there is no plan to link to Tk 8.6 in Python 3.4.2 on Mac? Or is there something that can override 8.5 to 8.6 as you wrote? The python.org 3.4.x series of installers will likely never change from linking with Tk 8.5 by default. That would break a number of important third-party Python packages that supply binary distributions built for the python.org OS X pythons, like matplotlib. For Python 3.5, we will have the opportunity to change that. In the meantime I tried MacPorts. It has Tk 8.6.1 so rotating text work well, but it has still a problem with semi-transparency as described here: http://core.tcl.tk/tk/tktview?name=99b84e49ff It has been fixed in Tk 8.6.2 that is already published for nearly a month, but there seems to be no uypdate on macports yet... File an update request for the tcl and tk ports on the MacPorts tracker. The project is usually very responsive to such requests. https://trac.macports.org Note that ActiveState hasn't yet released their versions of 8.6.2. So I am quite frustrated that I am not able to make my Python installation on Mac do the same things (namely roatting text and use png files that have semi-transparent pixels) both on Windows and Mac. As Kevin Walzer points out, you *can* also build your own. I still intend to provide a downloadable solution for 3.4.x and 2.7.x; I hope to get back to it shortly. Sorry for the delay! -- Ned Deily, n...@acm.org -- https://mail.python.org/mailman/listinfo/python-list
Re: Restarting Python
On 10/1/2014 10:47 AM, Steven D'Aprano wrote: Inside the interactive interpreter, I can restart the interpreter with four keystrokes: - Ctrl-D - UP-ARROW - ENTER Ctrl-D exits Python and returns me to the shell, UP-ARROW fetches the previous command (python), and ENTER runs that command. On Windows, I *think* you have to type Ctrl-Z ENTER instead of Ctrl-D, so that will be five keystrokes. For the console interpreter, this is still true even in 3.5.0a0 ^D File stdin, line 1 ♦ ^ SyntaxError: invalid syntax Idle now quits on ^D on all systems. ^Z (unlike other control chars) is rejected with an immediate error beep. Either way, restart is a single click if one have the console or Idle interpreter icon pinned on the task bar. Even this is unnecessary with Idle as it has a Restart Shell command on the Shell menu (hotkey ^F6). (This is automatically invoked when running an edited file (F5)). Some problems with restarting are unwinding the call stack, undoing what has been done, and doing something else so as to not run into the same problem. We can view every raise -- except pair as a partial restart of some sort. A minimal startup script something like the following allows a nearly global restart that addresses all three problems listed above. from appmain import main, cleanup, RestartError restart = False while True: try: main(restart) except RestartError as err: cleanup() restart = err continue The main and cleanup functions, switching on the restart arg, and possibly the class RestartError depend on the app. -- Terry Jan Reedy -- https://mail.python.org/mailman/listinfo/python-list
Re: Clearing globals in CPython
On 01/10/2014 17:00, Steven D'Aprano wrote: Out of curiosity, I ran: globals().clear() in the interactive interpreter. It broke much more than I expected! Built-ins were no longer available, and import stopped working. I expected that global variables would be all lost, but built-ins would remain, since they don't live in the global namespace. I was wrong: globals().clear() x = len([]) Traceback (most recent call last): File stdin, line 1, in module NameError: name 'len' is not defined The reason, I think, is that CPython has a special __builtins__ global variable that the interpreter uses to access built-in functions. What *appears* to be happening is that if that __builtins__ global is missing, CPython can not access the built-ins. (Supporting this interpretation: IronPython, like CPython, has a __builtins__ global, and behaves the same when the globals() are cleared. Jython, which does not have a __builtins__ global, does not.) Well that's okay, I thought to myself, I'll just import the built-in functions: from builtins import len # use '__builtin__' in Python 2 Traceback (most recent call last): File stdin, line 1, in module ImportError: __import__ not found Oops. So, with no built-ins available, import no longer works. That makes things rather tricky. Obviously the easiest way to recover is to exit the current session and restart it, but as a challenge, can we recover from this state? We obviously need a Restart Command. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
Re: Clearing globals in CPython
On 10/1/2014 12:00 PM, Steven D'Aprano wrote: Out of curiosity, I ran: globals().clear() in the interactive interpreter. It broke much more than I expected! Built-ins were no longer available, and import stopped working. As you discovered, this reduces the interpreter to a pure syntax machine with no name bindings -- sort of like a high-level assembler with no access to a function library. I expected that global variables would be all lost, but built-ins would remain, since they don't live in the global namespace. ... The reason, I think, is that CPython has a special __builtins__ global variable that the interpreter uses to access built-in functions. When executing statements from Shell, Idle restores __builtins__. globals().clear() print(dir()) ['__builtins__'] print(__builtins__) long listing The odd thing is that executing the same code from a file prints [] and then raises NameError: name '__builtins__' is not defined. Well that's okay, I thought to myself, I'll just import the built-in functions: from builtins import len # use '__builtin__' in Python 2 Traceback (most recent call last): File stdin, line 1, in module ImportError: __import__ not found Most keyword statements are implemented by internal functions not accessible from Python except through the statement syntax. Import is an exception. This is one of the hooks that allow the behavior of imports to be modified. The result is like, for instance, programming in C with 'include' disabled. Oops. So, with no built-ins available, import no longer works. That makes things rather tricky. Obviously the easiest way to recover is to exit the current session and restart it, but as a challenge, can we recover from this state? -- Terry Jan Reedy -- https://mail.python.org/mailman/listinfo/python-list
Re: JSON-encoding very long iterators
On Wednesday, October 1, 2014 6:07:23 AM UTC-7, Chris Angelico wrote: On Wed, Oct 1, 2014 at 8:13 PM, Alfred Morgan wrote: What do you think now? I think that you're adding features to Python 2.7, which isn't getting new features. That won't be merged into trunk. Does your patch apply to 3.x? ChrisA Thanks Chris, Yes I made changes to 2.7 because I'm not familiar with Python3 yet. Once I get some feedback I was going to see if someone was interested in porting it. If not I will learn and do it myself. The patch will not work on the 3.x code but the code is similar enough to easily port over. -- https://mail.python.org/mailman/listinfo/python-list
Re: Obscuring Python source from end users
On Mon, Sep 29, 2014 at 4:47 AM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: norman.i...@gmail.com wrote: Hello list Python 3.4 applies. I have a project that involves distributing Python code to users in an organisation. Users do not interact directly with the Python code; they only know this project as an Excel add-in. Now, internal audit takes exception in some cases if users are able to see the source code. You have my sympathy. Actually, I don't think this is that bad. Companies have rules; one simply has to learn to live with this or suffer greatly. Some rules are worth fighting, but this probably isn't one of them. So I'm wondering if anyone has clever suggestions in this regard... Yes. Distribute the pyc files only. Yes, this is the way it's usually done. Supposedly Microsoft did this for a while, after acquiring some Python software. In the Python 3.4 case, the pyc's should be in the __pycache__ subdirectory. Another option would be to convert to Cython and compile (not as bad as it sounds). But __pycache__/*.pyc would probably be easier. -- https://mail.python.org/mailman/listinfo/python-list
Function passed as an argument returns none
Hi,
I am learning Python (version 3.4) strings.I have a function that takes in a
parameter and prints it out as given below.
def donuts(count):
if count = 5:
print('Number of donuts: ',count)
else:
print('Number of donuts: many')
return
It works fine if I call
donuts(5)
It returns:
we have 5 DN (as expected)
However if I do :
test(donuts(4), 'Number of donuts: 4')
where test is defined as below:
def test(got, expected):
print('got: ', got, 'Expected:' ,expected)
if got == expected:
prefix = ' OK '
else:
prefix = ' X '
print (('%s got: %s expected: %s') % (prefix, repr(got), repr(expected)))
Only 'None' gets passed on to parameter 'got' instead of the expected value
of 4.
Any idea why 'None' is getting passed even though calling the donuts(4)
alone returns the expected value?
Thanks,
Shiva.
--
https://mail.python.org/mailman/listinfo/python-list
Re: Function passed as an argument returns none
On 2014.10.01 17:37, Shiva wrote: Only 'None' gets passed on to parameter 'got' instead of the expected value of 4. Any idea why 'None' is getting passed even though calling the donuts(4) alone returns the expected value? donuts() prints what you tell it to (Number of donuts: 5), and then returns what you tell it to (nothing). If you don't explicitly make a function return something, it returns None. Whatever other logic you have in the function is irrelevant. -- https://mail.python.org/mailman/listinfo/python-list
Re: Function passed as an argument returns none
Chris
On Wed, Oct 1, 2014 at 3:37 PM, Shiva shivaji...@yahoo.com.dmarc.invalid
wrote:
Hi,
I am learning Python (version 3.4) strings.I have a function that takes in
a
parameter and prints it out as given below.
def donuts(count):
if count = 5:
print('Number of donuts: ',count)
else:
print('Number of donuts: many')
return
Print actually prints the value, and does not return it.
Based off the rest of your code, you probably want this to look like
(untested):
def donuts(count):
if count = 5:
return 'Number of donuts: {}'.format(count) # You could also use other
formatting methods here, if you prefer the printf-style %s instead.
else:
return 'Number of donuts: many'
Which will cause donuts to return the actual string, rather than printing
it out to the TTY.
Note that this means that, if run from the interpreter as you have been
trying, the interpreter will now display Number of donuts: 4 - including
the quotes.
It works fine if I call
donuts(5)
It returns:
we have 5 DN (as expected)
However if I do :
test(donuts(4), 'Number of donuts: 4')
If you do as mentioned above, donuts will then return the value, and it
will be passed into test.
where test is defined as below:
def test(got, expected):
print('got: ', got, 'Expected:' ,expected)
if got == expected:
prefix = ' OK '
else:
prefix = ' X '
print (('%s got: %s expected: %s') % (prefix, repr(got), repr(expected)))
Only 'None' gets passed on to parameter 'got' instead of the expected value
of 4.
Any idea why 'None' is getting passed even though calling the donuts(4)
alone returns the expected value?
donuts is, in fact, returning None when called alone. It merely looks like
it is returning it as, when run from the interpreter, Python prints the
repr of the return values of any non-None returns. This is known as a
REPL: read, execute, print, loop. It is quite handy for debugging.
Chris
--
https://mail.python.org/mailman/listinfo/python-list
Re: JSON-encoding very long iterators
On Thu, Oct 2, 2014 at 8:01 AM, Alfred Morgan alf...@54.org wrote: On Wednesday, October 1, 2014 6:07:23 AM UTC-7, Chris Angelico wrote: On Wed, Oct 1, 2014 at 8:13 PM, Alfred Morgan wrote: What do you think now? I think that you're adding features to Python 2.7, which isn't getting new features. That won't be merged into trunk. Does your patch apply to 3.x? ChrisA Thanks Chris, Yes I made changes to 2.7 because I'm not familiar with Python3 yet. Once I get some feedback I was going to see if someone was interested in porting it. If not I will learn and do it myself. The patch will not work on the 3.x code but the code is similar enough to easily port over. Okay. At some point, you'll have to port your patch to the latest codebase, though, as the core devs won't want to do that work themselves. I recommend getting familiar enough with Python 3 to be able to see if the patch at least makes sense. (I expect it probably will.) Try out a vanilla 3.4 or master (3.5ish), then apply your patch, and see if the improvement is indeed visible. Assuming it is (again, I expect it will be; JSON isn't materially different in Python 3), you can post a 3.x patch here, and you'll have rather more interest, I think - certainly people like me won't be applying your 2.7 patch, as that's not something that's ever going to actually happen. But due to the changes of str/unicode to str/bytes in Py3, you will find that your patch requires more than just simple tweaks. It won't be as simple as apply the patch and fix a merge conflict; you'll have to rethink your changes and apply them to the different codebase. Unfortunately, that's just what happens when you start development on 2.7; there are differences in the code, and there's no getting around them. It'll be much easier for you if you get familiar with Py3 and do development there. :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Function passed as an argument returns none
On 01/10/2014 23:37, Shiva wrote:
Hi,
I am learning Python (version 3.4) strings.I have a function that takes in a
parameter and prints it out as given below.
def donuts(count):
if count = 5:
print('Number of donuts: ',count)
else:
print('Number of donuts: many')
return
It works fine if I call
donuts(5)
It returns:
we have 5 DN (as expected)
It doesn't :) As it takes the first path through the function it will
*print* 'Number of donuts: 5' and then return None as you haven't
specified what your function returns.
However if I do :
test(donuts(4), 'Number of donuts: 4')
where test is defined as below:
def test(got, expected):
print('got: ', got, 'Expected:' ,expected)
if got == expected:
prefix = ' OK '
else:
prefix = ' X '
print (('%s got: %s expected: %s') % (prefix, repr(got), repr(expected)))
Only 'None' gets passed on to parameter 'got' instead of the expected value
of 4.
Your expectations are wrong, your function makes no attempt to return
the value you've passed in. I'd (re)read the tutorial again and digest
it, then have another go.
Any idea why 'None' is getting passed even though calling the donuts(4)
alone returns the expected value?
What is your expected value? My expected value is None for a value of 4
as you've given a return statement without specifying a value.
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
--
https://mail.python.org/mailman/listinfo/python-list
Re: Function passed as an argument returns none
On Wed, 01 Oct 2014 22:37:13 +, Shiva wrote:
Hi,
I am learning Python (version 3.4) strings.I have a function that takes
in a parameter and prints it out as given below.
def donuts(count):
if count = 5:
print('Number of donuts: ',count)
else:
print('Number of donuts: many') return
It works fine if I call donuts(5)
It returns:
No it doesn't
we have 5 DN (as expected)
It doesn't return anything, it prints something out.
Printing something out from within a function is not the same as
returning something.
Consider the following::
def nonsense( something ):
print( something is, something )
return ( 5, elephants, { monkey: peanut, baboon:
banana, numbers: ( 1, ), }, [ 1, 2, 3, 4, 5,
mouse,( -6.34565e-35, 4.765213e84, ), ],
None, True, False, )
print( nonsense( 10 ) is, nonsense( 10 ) )
print( nonsense( None ) is, nonsense( None ) )
print( nonsense( ( 5, \donuts\, ) ) is, nonsense( ( 5, donuts, ) ) )
The above code shows there is no automatic connection between data output
carried out within a function and the value (if any) returned by that
function.
--
Denis McMahon, denismfmcma...@gmail.com
--
https://mail.python.org/mailman/listinfo/python-list
Error from pandas.io.data import DataReader
I am trying to run this snippet of code.
from pandas.io.data import DataReader
from pandas import Panel, DataFrame
import datetime
start = datetime.datetime(2010, 1, 1)
end = datetime.datetime(2013, 1, 27)
with open('dow.txt') as f:
symbols = f.read().splitlines() # ['AAPL', 'GLD', 'SPX', 'MCD']
data = dict((symbol, DataReader(symbol, yahoo, start, end, pause=1)) for
symbol in symbols)
panel = Panel(data).swapaxes('items', 'minor')
closing = panel['Close'].dropna()
closing.head()
I keep getting this error.
Traceback (most recent call last):
File C:\Python27\download_dow.py, line 1, in module
from pandas.io.data import DataReader
ImportError: No module named pandas.io.data
--
https://mail.python.org/mailman/listinfo/python-list
Re: Function passed as an argument returns none
On Thursday, October 2, 2014 4:07:44 AM UTC+5:30, Shiva wrote:
Hi,
I am learning Python (version 3.4) strings.I have a function that takes in a
parameter and prints it out as given below.
def donuts(count):
if count = 5:
print('Number of donuts: ',count)
else:
print('Number of donuts: many')
return
It works fine if I call
donuts(5)
It returns:
we have 5 DN (as expected)
However if I do :
test(donuts(4), 'Number of donuts: 4')
where test is defined as below:
def test(got, expected):
print('got: ', got, 'Expected:' ,expected)
if got == expected:
prefix = ' OK '
else:
prefix = ' X '
print (('%s got: %s expected: %s') % (prefix, repr(got), repr(expected)))
Only 'None' gets passed on to parameter 'got' instead of the expected value
of 4.
Any idea why 'None' is getting passed even though calling the donuts(4)
alone returns the expected value?
Others have given you the correct python-technicalities answer:
print ≠ return
However given your starting point – I am learning Python – let me try
a less technical one.
You start from the assumption that your donuts returns 5, which it
seems to in some contexts and not in others.
So by now you know there are 2 kinds of return:
def foo(x): return x+5
...
def bar(x): print(x+5)
...
foo(4)
9
bar(4)
9
So they seem identical here, right?
But as you further discover bar is useless to do anything other than
being called at the command line, whereas foo can be used in all sorts of
ways: in particular you can use foo to write bar:
def bar(x): print(foo(x))
But not conversely.
So the morals in short:
1. Stick to the return that works -- python's return statement --
and avoid the return that seems to work -- the print statement
2. print is good for debugging code. When your code is bugfree it should have
few/no prints
3. The official tutorial/docs unfortunately foster bad habits in children by
showing prints early --
Know better!
--
https://mail.python.org/mailman/listinfo/python-list
Re: Function passed as an argument returns none
On Thu, Oct 2, 2014 at 12:29 PM, Rustom Mody rustompm...@gmail.com wrote: So by now you know there are 2 kinds of return: So the morals in short: 1. Stick to the return that works -- python's return statement -- and avoid the return that seems to work -- the print statement Please. There are not two types of return; there are two completely different things here. Don't pretend that print is a bad form of return. It isn't. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: How to show a dictionary sorted on a value within its data?
Sent from my iPhone On Oct 1, 2014, at 04:12, Peter Otten __pete...@web.de wrote: `lambda` is just a fancy way to define a function inline Not sure fancy is the correct adjective; more like syntactic tartness (a less sweet version of syntactic sugar). :) -- https://mail.python.org/mailman/listinfo/python-list
Re: Obscuring Python source from end users
Dan Stromberg drsali...@gmail.com: On Mon, Sep 29, 2014 at 4:47 AM, Steven D'Aprano Yes. Distribute the pyc files only. Yes, this is the way it's usually done. Has the .pyc file format stabilized? A decade ago, my employer shipped an application as .pyc files but had to ship the matching CPython binary with it. Marko -- https://mail.python.org/mailman/listinfo/python-list
[issue22472] OSErrors should use str and not repr on paths
Serhiy Storchaka added the comment: вівторок, 30-вер-2014 19:26:52 ви написали: How do I reconstruct an arbitrary OSError error message using the filename parameter? if not e.args: msg = '' elif len(e.args) == 1: msg = str(e.args[0]) elif len(e.args) = 5: msg = '[Error %s] %s' % e.args[:2] if len(e.args) 2: msg = '%s: %r' % (msg, e.args[2]) # filename if len(e.args) 4: msg = '%s - %r' % (msg, e.args[4]) # filename2 else: msg = str(e.args) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22472 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20079] Add support for glibc supported locales
Marc-Andre Lemburg added the comment: Thanks, Serhiy. The patch looks good, except for one nit: the makelocalealias.py normaly also generates a list of changes and these are put at the top of the locale_alias dictionary. Could you add that as well ? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20079 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17873] _ctypes/libffi missing bits for aarch64 support
Andreas Schwab added the comment: https://build.opensuse.org/package/show/openSUSE:Factory:ARM/python3-base -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17873 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20079] Add support for glibc supported locales
Serhiy Storchaka added the comment: The makelocalealias.py generates only a list of removes and updates, not additions. I recommend first apply issue20076, it will eliminate most additions. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20079 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19113] duplicate test names in Lib/ctypes/test/test_functions.py
Xavier de Gaye added the comment: This issue has been entered while checking for duplicate test names in issue 16079. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19113 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21963] 2.7.8 backport of Issue1856 (avoid daemon thread problems at shutdown) breaks ceph
STINNER Victor added the comment: Oh by the way, I also prefer to revert the commit. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21963 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21574] Port image types detections from PIL to the imghdr module
Andriy Sokolovskiy added the comment: I'll try to do this issue. https://mail.python.org/mailman/private/core-mentorship/2014-October/002766.html -- nosy: +coldmind ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21574 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22492] small addition to print() docs: no binary streams.
Georg Brandl added the comment: Looks good. sys.stdout, when rebound to a binary mode file Not sure that is supported in any way :) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22492 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22531] Turn contextlib.{redirect_stdout, suppress} into ContextDecorators
New submission from Antony Lee:
A small lib improvement suggestion could be to make contextlib.redirect_stdout
and contextlib.suppress inherit from ContextDecorator.
As a side note, the source of contextlib has some classes inheriting explicitly
from object while others don't, so perhaps this can be harmonized at the same
time.
--
components: Library (Lib)
messages: 228065
nosy: Antony.Lee
priority: normal
severity: normal
status: open
title: Turn contextlib.{redirect_stdout,suppress} into ContextDecorators
versions: Python 3.4, Python 3.5
___
Python tracker rep...@bugs.python.org
http://bugs.python.org/issue22531
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20076] Add UTF-8 locale aliases
Marc-Andre Lemburg added the comment: Thanks, Serhiy The patch looks good. Please apply. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20076 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20079] Add support for glibc supported locales
Marc-Andre Lemburg added the comment: On 01.10.2014 09:52, Serhiy Storchaka wrote: The makelocalealias.py generates only a list of removes and updates, not additions. Ah, ok. I recommend first apply issue20076, it will eliminate most additions. Agreed. Please apply both patches. Thanks, -- Marc-Andre Lemburg eGenix.com -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20079 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22494] default logging time string is not localized
Antoine Pitrou added the comment: I'm a bit surprised here, since the comma is not the default (US) decimal point. -- nosy: +pitrou ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22494 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21971] Index and update turtledemo doc.
Changes by Ezio Melotti ezio.melo...@gmail.com: -- keywords: +easy ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21971 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22001] containers same does not always mean __eq__.
Changes by Ezio Melotti ezio.melo...@gmail.com: -- nosy: +ezio.melotti ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22001 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21999] shlex: bug in posix mode handling of empty strings
Changes by Ezio Melotti ezio.melo...@gmail.com: -- nosy: +ezio.melotti stage: needs patch - patch review ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21999 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22494] default logging time string is not localized
Georg Brandl added the comment: It's not so surprising, since the string before the milliseconds part is a strftime() result, not a whole number. The decimal point need not necessarily be used for this. Just like the rest of the default time format, it is probably best for the millisecond part to be locale independent unless chosen to be locale aware by the programmer. Using the comma is apparently common among loggers. I've seen it in logs generated by log4j and log4cpp as well. -- nosy: +georg.brandl ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22494 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22531] Turn contextlib.{redirect_stdout, suppress} into ContextDecorators
Changes by Berker Peksag berker.pek...@gmail.com: -- nosy: +ncoghlan ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22531 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22494] default logging time string is not localized
Vinay Sajip added the comment: ISO 8601 governs the format used. From the Wikipedia article on the same: A decimal mark, either a comma or a dot (without any preference as stated in resolution 10 of the 22nd General Conference CGPM in 2003, but with a preference for a comma according to ISO 8601:2004) is used as a separator between the time element and its fraction. -- resolution: - not a bug status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22494 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Eric V. Smith added the comment: Is there some particular problem you're trying to solve, which this would make easier? Without a use case, I'm -1. -- nosy: +eric.smith ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Ram Rachum added the comment: I needed it for an internal calculation in a combinatorics package I'm writing. Do you want me to take the time to explain the calculation? It's quite complex. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22532] A suggested change
New submission from Padmanabhan Tr: Take a complex number n = 3+4j. n.real is taken as 3.0 n.imag as 4.0 in Python3. One has to use the int(0 function to get back the parts as integers. I guess this is a compiler error? -- messages: 228073 nosy: Padmanabhan.Tr priority: normal severity: normal status: open title: A suggested change type: compile error versions: Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22532 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22472] OSErrors should use str and not repr on paths
R. David Murray added the comment: Thank you, Serhiy. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22472 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22531] Turn contextlib.{redirect_stdout, suppress} into ContextDecorators
R. David Murray added the comment: -100 on doing this for suppress. That would be exactly the kind of wrong-headed code that I was worried that context manager would invite. -- nosy: +r.david.murray ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22531 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22532] A suggested change
Geoffrey Spear added the comment: From the documentation: Complex numbers have a real and imaginary part, which are each a floating point number. Needing to use int() to convert these floats to integers is not a bug, it's the expected behavior. -- nosy: +geoffreyspear ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22532 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22532] A suggested change
Changes by Geoffrey Spear geoffsp...@gmail.com: -- components: +Interpreter Core type: compile error - behavior ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22532 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22532] A suggested change
Changes by Eric V. Smith e...@trueblade.com: -- resolution: - not a bug stage: - resolved status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22532 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Eric V. Smith added the comment: No need to explain it. It sounds like it's not generally useful, so I'm still -1. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22531] Turn contextlib.{redirect_stdout, suppress} into ContextDecorators
Nick Coghlan added the comment: Aye, suppress is only intended for use around a single line of code. Using it for an entire function would be OnError Resume Next levels of poor coding style. I'm also -1 on implicitly wrapping redirect_stdout around functions due to the immediate thread safety problem doing so introduces. The stdout redirection really only makes sense in a single-threaded scripting context, and using it as a decorator rather than inline makes it far too easy to inadvertently violate that constraint. As far as the explicitly inherit from object or not goes, it wouldn't surprise me if that's just a migrated from Python 2 vs first introduced in Python 3 distinction. It's not something I would change solely for the sake of consistency. -- resolution: - rejected stage: - resolved status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22531 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22528] Missing hint to source code
Friedrich Spee von Langenfeld added the comment: Excuse me, but it would be nice to fix the documentation of the modules symtable and compileall too. Thanks. -- resolution: fixed - status: closed - open ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22528 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22532] A suggested change
Padmanabhan Tr added the comment: Dear Mr SpearThanks for the prompt response clarification.(in Python) If the real imaginary parts of numbers you deal with are integers, results of operations (except division) - like +, -, *, **, - appear with respective integers as real imginary parts. In line with these, changes in '.real' '.imag' may be desirable? On Wednesday, October 1, 2014 8:19 PM, Eric V. Smith rep...@bugs.python.org wrote: Changes by Eric V. Smith e...@trueblade.com: -- resolution: - not a bug stage: - resolved status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22532 ___ -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22532 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Antoine Pitrou added the comment: Even if you don't find it useful, Eric, it doesn't take up the method space. You can very easily ignore it, there's no cognitive burden. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Ethan Furman added the comment: Curiousity question: What happens if you try to sort a list of partially ordered Counters? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Antoine Pitrou added the comment: If it is so specialized as to only be needed in complex combinatorial calculations How do you know it is only needed in complex combinatorial calculations? What happens if you try to sort a list of partially ordered Counters? Try it with partially ordered sets. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Ethan Furman added the comment: If it is so specialized as to only be needed in complex combinatorial calculations, does it belong in the general-purpose part of the language? After all, we have the math and cmath modules for more specialized arithmetic operations. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Ram Rachum added the comment: I don't see why it's so hard to imagine how this will be used. Say I have a counter signifying how many of each product I have in my warehouse, and I have another counter saying how many of each product a client wants. I may use `counter2 = counter1` to check whether there are enough products in stock. Sounds straightforward to me. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Ethan Furman added the comment:
-- s1 = set([1])
-- s2 = set([1, 2])
-- s3 = set([1, 2, 3])
-- s4 = set([2])
-- s5 = set([2, 3])
-- s6 = set([3])
-- l = [s1, s2, s3, s4, s5, s6]
-- sorted(l)
[{1}, {2}, {1, 2}, {3}, {2, 3}, {1, 2, 3}]
-- s1 s4
False
-- s4 s2
True
-- s1 s2
True
-- s4 s6
False
-- l = [s1, s4]
-- sorted(l)
[{1}, {2}]
-- sorted(l)
[{1}, {2}]
Looks horribly messy to me. In the last example we can see that neither s1 nor
s4 are smaller, yet s1 is consistently put first.
On the other hand, I suppose it's okay for Counter to have this behavior since
it's already in sets.
--
___
Python tracker rep...@bugs.python.org
http://bugs.python.org/issue22515
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Steven D'Aprano added the comment:
Ethan said:
If it is so specialized as to only be needed in complex combinatorial
calculations, does it belong in the general-purpose part of the
language?
It's a multi-set, a general purpose and fairly fundamental data type.
https://en.wikipedia.org/wiki/Set_%28abstract_data_type%29#Multiset
And later:
Curiousity question: What happens if you try to sort a list of
partially ordered Counters?
The same thing that happens when you sort a list of any partially
ordered objects, such as sets:
py sorted([{1, 2, 3, 4}, {2, 4}, {1, 3}, {2, 3, 4}, {1, 2, 3}])
[{2, 4}, {1, 3}, {2, 3, 4}, {1, 2, 3}, {1, 2, 3, 4}]
You get some order, but since sorting assumes a total order, not just
partial order, the result isn't really meaningful, and will very likely
depend on the initial order of the items. If that worries you, then
don't sort items that implement only a partial order.
--
___
Python tracker rep...@bugs.python.org
http://bugs.python.org/issue22515
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9949] os.path.realpath on Windows does not follow symbolic links
Changes by Thomas Kluyver tak...@gmail.com: -- nosy: +takluyver ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9949 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Ethan Furman added the comment: I'll go with +0.5. :) If this goes in, I think a missing key in either Counter should default to 0 for purposes of the ordering. -- stage: - test needed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Ram Rachum added the comment: If/when there's general agreement that this functionality should be merged in (assuming the implementation is acceptable), let me know and I'll be happy to write the code and tests. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22515 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20218] Add methods to `pathlib.Path`: `write_text`, `read_text`, `write_bytes`, `read_bytes`
Roundup Robot added the comment: New changeset a4da150fbfd4 by Georg Brandl in branch 'default': Closes #20218: Added convenience methods read_text/write_text and read_bytes/ https://hg.python.org/cpython/rev/a4da150fbfd4 -- nosy: +python-dev resolution: - fixed stage: - resolved status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20218 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20218] Add methods to `pathlib.Path`: `write_text`, `read_text`, `write_bytes`, `read_bytes`
Antoine Pitrou added the comment: Thanks, Georg! -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20218 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22515] Implement partial order on Counter
Antoine Pitrou added the comment:
I'll go with +0.5. :)
I was going to make a joke about Counters only accepting integral values, but
the constructor is actually quite laxist:
Counter({'a': 2.5})
Counter({'a': 2.5})
Counter({'a': 2.5 + 1j})
Counter({'a': (2.5+1j)})
Counter({'a': 'b'})
Counter({'a': 'b'})
(!)
--
___
Python tracker rep...@bugs.python.org
http://bugs.python.org/issue22515
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19529] Fix unicode_aswidechar() with 4byte unicode and 2byte wchar_t, for AIX
Georg Brandl added the comment: Committed in 18983332626b. -- resolution: - fixed status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19529 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
