Karlsruhe (Germany) Python User Group, August 15th 2014, 7pm
The Karlsruhe Python User Group (KaPy) meets again. Friday, 2014-08-15 (August 15th) at 19:00 (7pm) in the rooms of Entropia eV (the local affiliate of the CCC). See http://entropia.de/wiki/Anfahrt on how to get there. For your calendars: meetings are held monthly, on the 3rd Friday. There's also a mailing list at https://lists.bl0rg.net/cgi-bin/mailman/listinfo/kapy. -- https://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
new devpi-2.0.1/2 releases: fixes, new anonymous upload
The new devpi releases (devpi-server-2.0.2, devpi-web-2.0.1, devpi-client-2.0.1) contain several fixes for the private github-style pypi caching server, see the changelog below for details. Find all the documentation at http://doc.devpi.net/latest with tutorials and quickstart documents for particular scenarios. Note that no export/import procedure is needed if you are already running a 2.X devpi-server. If upgrading from a 1.2 devpi-server install, you need to upgrade using these instructions: http://doc.devpi.net/latest/quickstart-server.html#versioning-exporting-and-importing-server-state many thanks to Florian Schulze who again helped a lot with this release. have fun, holger krekel devpi-2.0.1 (metapackage) - devpi-server-2.0.2: - fix issue120: link to upgrade section from main index page. - preserve http reason string for setup.py submit through replica proxying - proper error message when devpi push X uses an X that comes from a base index or is not existent - fix issue121: depend on py-1.4.23 to fix python3.4 compatibility for a venusian/py34/py interaction import oddity. - fix issue126: handle deletion of pypi project cache entries correctly (i.e. ones that are triggered by refresh on simple page). - Add special handling of :ANONYMOUS: user in acl_upload to allow anonymous submit. - fix nginx template so that when used in a replica setting the master always answers HEAD requests without nginx short-cirtcuiting it. - increase internal cache size to improve performance when many indexes and projects are served. devpi-web-2.0.1: - fix issue125: javascript for embedded doc view didn't work correctly. - fix issue118: rendering of description with unicode. devpi-client-2.0.1: - fix a test to expect a 403 instead of a 401 from devpi server from unauthorized access - fix error message on API version client/server mismatch - fix issue124: package name url matching for the devpi test command -- https://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
pytest-timeout 0.4
Hi, I'm pleased to announce the availability of pytest-timeout 0.4: https://pypi.python.org/pypi/pytest-timeout/0.4 pytest-timeout is a plugin for the py.test testing framework which will interrupt hanging tests after a timeout and show stack traces for all threads at this time. This can greatly easy debugging certain issues, especially when running tests on continuous integration server. This release provides support for using pytest-timeout in conjunction with the --pdb option from py.test. When a test fails and py.test drops you into an interactive pdb session pytest-timeout will now no longer time-out the test. Additionally this release fixes a bug where a hang in the teardown of a session-scoped fixture would not be caught by pytest-timeout. Regards, Floris -- Debian GNU/Linux -- The Power of Freedom www.debian.org | www.gnu.org | www.kernel.org -- https://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
pytest-2.6.1: fixes and expecting exceptions in xfail
pytest-2.6.1: fixes and new xfail marker feature === pytest is a mature Python testing tool with an extensive self-test test suite, passing on many different interpreters and platforms. The 2.6.1 release is drop-in compatible to 2.5.2 and actually fixes some regressions introduced with 2.6.0. It also brings a little feature to the xfail marker which now recognizes expected exceptions, see the CHANGELOG below. See docs at: http://pytest.org As usual, you can upgrade from pypi via:: pip install -U pytest Thanks to all who contributed, among them: Floris Bruynooghe Bruno Oliveira Nicolas Delaby have fun, holger krekel Changes 2.6.1 = - No longer show line numbers in the --verbose output, the output is now purely the nodeid. The line number is still shown in failure reports. Thanks Floris Bruynooghe. - fix issue437 where assertion rewriting could cause pytest-xdist slaves to collect different tests. Thanks Bruno Oliveira. - fix issue555: add errors attribute to capture-streams to satisfy some distutils and possibly other code accessing sys.stdout.errors. - fix issue547 capsys/capfd also work when output capturing (-s) is disabled. - address issue170: allow pytest.mark.xfail(...) to specify expected exceptions via an optional raises=EXC argument where EXC can be a single exception or a tuple of exception classes. Thanks David Mohr for the complete PR. - fix integration of pytest with unittest.mock.patch decorator when it uses the new argument. Thanks Nicolas Delaby for test and PR. - fix issue with detecting conftest files if the arguments contain :: node id specifications (copy pasted from -v output) - fix issue544 by only removing @NUM at the end of :: separated parts and if the part has an .py extension - don't use py.std import helper, rather import things directly. Thanks Bruno Oliveira. -- https://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: Keep one GUI always on TOP while python code is running
Chris, I mean to say, One GUI should be always on top from start to end of code running. So that user cant do any other operation. I am using wxpython Regards Jay -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Fri, Aug 8, 2014 at 3:57 PM, Jaydeep Patil patil.jay2...@gmail.com wrote: I mean to say, One GUI should be always on top from start to end of code running. So that user cant do any other operation. I am using wxpython Ah, that would be called System Modal, and should be reserved for absolutely critical system-wide alerts. It's also a feature that's simply not available to most user-space programs, and not available in most GUI toolkits. Short answer: Don't. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: AttributeError: 'module' object has no attribute 'fork'
On Friday, August 8, 2014 11:18:17 AM UTC+5:30, Steven D'Aprano wrote: Rustom Mody wrote: On Thursday, August 7, 2014 10:26:56 PM UTC+5:30, Steven D'Aprano wrote: Roy Smith wrote: Peter Otten wrote: os.fork() Fork a child process. ... Availability: Unix. You are using the wrong operating system ;) To be honest, this could be considered a buglet in the os module. It really should raise: NotImplementedError(fork() is only available on unix) or perhaps even, as Peter suggests: NotImplementedError(You are using the wrong operating system) either of those would be better than AttributeError. I disagree. How would you tell if fork is implemented? With the current behaviour, telling whether fork is implemented or not is simple: is_implemented = hasattr(os, fork) [...] Surely I am missing something but why not check os.fork before checking os.fork() ? Yes, you're missing something. That's what hasattr does. But with Roy's suggestion, testing for the existence of os.fork is not sufficient, because it will exist even on platforms where fork doesn't exist. So testing that os.fork exists is not sufficient to tell whether or not you can actually fork. Windows: Python 2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit (Intel)] on win32 Type copyright, credits or license() for more information. import os os.fork Traceback (most recent call last): File pyshell#1, line 1, in module os.fork AttributeError: 'module' object has no attribute 'fork' Linux: $ python Python 2.7.8 (default, Jul 4 2014, 13:08:34) [GCC 4.9.0] on linux2 Type help, copyright, credits or license for more information. import os os.fork built-in function fork So yes, I continue to miss something... -- https://mail.python.org/mailman/listinfo/python-list
Re: AttributeError: 'module' object has no attribute 'fork'
On Fri, Aug 8, 2014 at 5:17 PM, Rustom Mody rustompm...@gmail.com wrote: But with Roy's suggestion, testing for the existence of os.fork is not sufficient, because it will exist even on platforms where fork doesn't exist. So testing that os.fork exists is not sufficient to tell whether or not you can actually fork. Windows: Python 2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit (Intel)] on win32 Type copyright, credits or license() for more information. import os os.fork Traceback (most recent call last): File pyshell#1, line 1, in module os.fork AttributeError: 'module' object has no attribute 'fork' Linux: $ python Python 2.7.8 (default, Jul 4 2014, 13:08:34) [GCC 4.9.0] on linux2 Type help, copyright, credits or license for more information. import os os.fork built-in function fork So yes, I continue to miss something... I think the bit you're missing is the with Roy's suggestion bit, at which os.fork() would be callable and would raise a different error. It's of course possible for fork() to fail (no memory, ulimit hit, etc etc etc), but I would expect that the presence of os.fork should correspond perfectly to the API's availability (at least as detected by Python's compilation testing). ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: more simple to split the string?
On 08/08/2014 01:23, elearn wrote:
str='(\\HasNoChildren \\Junk) / [Gmail]/V4NXPpCuTvY-'
First up it's not usually a good idea to override the builtin name str.
x=str.split(' ')
[i.replace('','') for i in x]
['(\\HasNoChildren \\Junk)', '/', '[Gmail]/V4NXPpCuTvY-']
x.strip( ) will create four parts.
I assume you meant x=str.split( ) ? Even so I don't see how you can
get four parts so please explain.
is there more simple to do that ?
No loop needed that I can see.
oldstr='(\\HasNoChildren \\Junk) / [Gmail]/V4NXPpCuTvY-';oldstr
'(\\HasNoChildren \\Junk) / [Gmail]/V4NXPpCuTvY-'
newstr=oldstr.replace('', '');newstr
'(\\HasNoChildren \\Junk) / [Gmail]/V4NXPpCuTvY-'
substrings=newstr.split();substrings
['(\\HasNoChildren', '\\Junk)', '/', '[Gmail]/V4NXPpCuTvY-']
--
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
Template language for random string generation
This is a proposal with a working implementation for a random string generation
template syntax for Python. `strgen` is a module for generating random strings
in Python using a regex-like template language. Example:
from strgen import StringGenerator as SG
SG([\l\d]{8:15}[\d][\p]).render()
u'F0vghTjKalf4^mGLk'
The template ([\l\d]{8:15}[\d][\p]) generates a string from 8 to 15
characters in length with letters, digits. It is guaranteed to have at least
one digit (maybe more) and exactly one punctuation character.
If you look at various forums, like Stackoverflow, on how to generate random
strings with Python, especially for passwords and other hopefully secure
tokens, you will see dozens of variations of this:
import random
import string
mypassword = ''.join(random.choice(string.ascii_uppercase +
string.digits) for x in range(10))
There is nothing wrong with this (it's the right answer and is very fast), but
it leads developers to constantly:
* Use cryptographically weak methods
* Forget that the above does not guarantee a result that includes the different
classes of characters
* Doesn't include variable length or minimum length output
* It's a lot of typing and the resulting code is vastly different each time
making it hard to understand what features were implemented, especially for
those new to the language
* You can extend the above to include whatever requirements you want, but it's
a constant exercise in wheel reinvention that is extremely verbose, error prone
and confusing for exactly the same purposes each time
This application (generation of random strings for passwords, vouchers, secure
ids, test data, etc.) is so general, it seems to beg for a general solution.
So, why not have a standard way of expressing these using a simple template
language?
strgen:
* Is far less verbose than commonly offered solutions
* Trivial editing of the pattern lets you incorporate additional important
features (variable length, minimum length, additional character classes, etc.)
* Uses a pattern language superficially similar to regular expressions, so it's
easy to learn
* Uses SystemRandom class (if available, or falls back to Random)
* Supports 2.6 through 3.3
* Supports unicode
* Uses a parse tree, so you can have complex - nested - expressions to do
tricky data generation tasks, especially for test data generation
In my opinion, it would make using Python for this application much easier and
more consistent for very common requirements. The template language could
easily be a cross-language standard like regex.
You can `pip install strgen`.
It's on Github: https://github.com/paul-wolf/strgen
--
https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
Chris Angelico ros...@gmail.com writes: On Fri, Aug 8, 2014 at 3:57 PM, Jaydeep Patil patil.jay2...@gmail.com wrote: I mean to say, One GUI should be always on top from start to end of code running. So that user cant do any other operation. I am using wxpython Ah, that would be called System Modal, and should be reserved for absolutely critical system-wide alerts. It's also a feature that's simply not available to most user-space programs, and not available in most GUI toolkits. Short answer: Don't. There are commercial software packages that do this sort of thing. Examsoft is one - the idea being that people can take exams without access to other software at the same time (so that, for example, they could look at previously prepared notes). -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
On Fri, Aug 8, 2014 at 7:01 PM, Paul Wolf paulwolf...@gmail.com wrote: This is a proposal with a working implementation for a random string generation template syntax for Python. `strgen` is a module for generating random strings in Python using a regex-like template language. Looks good! One thing, though: * Supports 2.6 through 3.3 The implication of a simple reading of this statement is that your code should run on 2.6, 2.7, 3.0, 3.1, 3.2, and 3.3, and hasn't been tested on 3.4. But I eyeballed your code, and I'm seeing a lot of u'string' prefixes, which aren't supported on 3.0-3.2 (they were reinstated in 3.3 as per PEP 414), so a more likely version set would be 2.6+, 3.3+. What's the actual version support? Apologies for making such a minor quibble! But I'm curious as to what you actually support. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Fri, Aug 8, 2014 at 6:57 PM, Paul Rudin paul.nos...@rudin.co.uk wrote: Chris Angelico ros...@gmail.com writes: On Fri, Aug 8, 2014 at 3:57 PM, Jaydeep Patil patil.jay2...@gmail.com wrote: I mean to say, One GUI should be always on top from start to end of code running. So that user cant do any other operation. I am using wxpython Ah, that would be called System Modal, and should be reserved for absolutely critical system-wide alerts. It's also a feature that's simply not available to most user-space programs, and not available in most GUI toolkits. Short answer: Don't. There are commercial software packages that do this sort of thing. Examsoft is one - the idea being that people can take exams without access to other software at the same time (so that, for example, they could look at previously prepared notes). Yeah; like I said, Don't is the short answer. There will be exceptions, some extremely rare situations when system modality is correct; but fundamentally, it's impossible to use GUI software to control what a person does with a computer (for instance, on all my Linux systems, I can hit Ctrl-Alt-F1 to switch away from the GUI altogether). So I'm dubious about its value for anything that isn't an absolutely critical alert. With the OS/2 Presentation Manager, I had SystemModal available as a window flag, and I used it for two purposes: an out-of-memory alert (or similarly critical resource shortage), and a pseudo-login screen (it just asked for a name, no password or anything, and it didn't change what you had access to - it was for the purposes of logging and messaging identification, nothing more); and the latter didn't really need to be system modal, it was just for convenience. If there's no way to make a wxpython window system modal, I would say it's no great loss. The chances of the feature being misused are extremely high; the cases where it's actually needed are extremely rare. Hence my short answer of Don't; honestly, there are more times when you need to optimize Python code for performance than there are times to create system modal windows. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
On Friday, 8 August 2014 10:22:33 UTC+1, Chris Angelico wrote: But I eyeballed your code, and I'm seeing a lot of u'string' prefixes, which aren't supported on 3.0-3.2 (they were reinstated in 3.3 as per PEP 414), so a more likely version set would be 2.6+, 3.3+. What's the actual version support? ChrisA I'm going to have to assume you are right that I only tested on 3.3, skipping 2.7 and 3.3. I'll create an issue for that. -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
On 8/8/14 5:42 AM, Paul Wolf wrote: On Friday, 8 August 2014 10:22:33 UTC+1, Chris Angelico wrote: But I eyeballed your code, and I'm seeing a lot of u'string' prefixes, which aren't supported on 3.0-3.2 (they were reinstated in 3.3 as per PEP 414), so a more likely version set would be 2.6+, 3.3+. What's the actual version support? ChrisA I'm going to have to assume you are right that I only tested on 3.3, skipping 2.7 and 3.3. I'll create an issue for that. Don't bother trying to support =3.2. It will be far more difficult than it is worth in terms of adoption of the library. Also, you don't need to write a proposal for your library. You've written the library, and it's on PyPI. You aren't trying to add it to the stdlib, so there's no agreement you need to get from anyone else. It can simply succeed on its merits with people using it. -- Ned Batchelder, http://nedbatchelder.com -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
On Fri, Aug 8, 2014 at 9:20 PM, Ned Batchelder n...@nedbatchelder.com wrote: On 8/8/14 5:42 AM, Paul Wolf wrote: On Friday, 8 August 2014 10:22:33 UTC+1, Chris Angelico wrote: But I eyeballed your code, and I'm seeing a lot of u'string' prefixes, which aren't supported on 3.0-3.2 (they were reinstated in 3.3 as per PEP 414), so a more likely version set would be 2.6+, 3.3+. What's the actual version support? ChrisA I'm going to have to assume you are right that I only tested on 3.3, skipping 2.7 and 3.3. I'll create an issue for that. Don't bother trying to support =3.2. It will be far more difficult than it is worth in terms of adoption of the library. Agreed. I would be looking at the solution here being test on 3.4, then (assuming no problems) declare that it works on 3.3+. Anyone on Debian Wheezy can spin up a Python 3 from source anyway, and presumably ditto for any other Linux distro that's distributing 3.1 or 3.2; most other platforms should have a more modern Python available one way or another. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Specifying `blocking` and `timeout` when acquiring lock as a context manager
Hi all, If I want to acquire a `threading.Lock` using the context manager protocol, is it possible to specify the `blocking` and `timeout` arguments that `acquire` would usually take? Thanks, Ram. -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
On Friday, 8 August 2014 12:20:36 UTC+1, Ned Batchelder wrote: On 8/8/14 5:42 AM, Paul Wolf wrote: Don't bother trying to support =3.2. It will be far more difficult than it is worth in terms of adoption of the library. Also, you don't need to write a proposal for your library. You've written the library, and it's on PyPI. You aren't trying to add it to Thanks for that. I'll follow that advice. -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
On Friday, 8 August 2014 12:29:09 UTC+1, Chris Angelico wrote: Debian Wheezy can spin up a Python 3 from source anyway, and presumably ditto for any other Linux distro that's distributing 3.1 or 3.2; most other platforms should have a more modern Python available one way or another. ChrisA Yes, agreed. I'll update the version info. -- https://mail.python.org/mailman/listinfo/python-list
Re: Specifying `blocking` and `timeout` when acquiring lock as a context manager
On 08/08/2014 04:51 AM, cool-RR wrote: If I want to acquire a `threading.Lock` using the context manager protocol, is it possible to specify the `blocking` and `timeout` arguments that `acquire` would usually take? Not that I know of, but why would you want to? There's no built-in 'if' with a 'with' block -- how would your code know whether it ran or not? -- ~Ethan~ -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Thursday, August 7, 2014 4:54:09 PM UTC+5:30, Jaydeep Patil wrote: Hi all, I have one query. I have did some programming which copies and paste data using system clipboard. I need to keep one GUI always on top till my python code is running. In linux you can do (at shell level) $ wmctrl -r window -b add,above Note: In place of window you will need a string that is in your window title You can get these with $ wmctrl -l You can then stuff this into python with os.system Windows: No idea -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Fri, Aug 8, 2014 at 11:44 PM, Rustom Mody rustompm...@gmail.com wrote: On Thursday, August 7, 2014 4:54:09 PM UTC+5:30, Jaydeep Patil wrote: Hi all, I have one query. I have did some programming which copies and paste data using system clipboard. I need to keep one GUI always on top till my python code is running. In linux you can do (at shell level) $ wmctrl -r window -b add,above AIUI that just sets the always on top flag, which isn't what he's asking for. Also, his toolkit should offer that directly. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
Chris Angelico wrote: On Fri, Aug 8, 2014 at 6:57 PM, Paul Rudin paul.nos...@rudin.co.uk wrote: Chris Angelico ros...@gmail.com writes: On Fri, Aug 8, 2014 at 3:57 PM, Jaydeep Patil patil.jay2...@gmail.com wrote: I mean to say, One GUI should be always on top from start to end of code running. So that user cant do any other operation. I am using wxpython Ah, that would be called System Modal, and should be reserved for absolutely critical system-wide alerts. It's also a feature that's simply not available to most user-space programs, and not available in most GUI toolkits. Short answer: Don't. There are commercial software packages that do this sort of thing. Examsoft is one - the idea being that people can take exams without access to other software at the same time (so that, for example, they could look at previously prepared notes). Yeah; like I said, Don't is the short answer. There will be exceptions, some extremely rare situations when system modality is correct; but fundamentally, it's impossible to use GUI software to control what a person does with a computer There are exceptions, but it's impossible? Impossible except for the exceptions, I presume :-P (for instance, on all my Linux systems, I can hit Ctrl-Alt-F1 to switch away from the GUI altogether). Does that work when xscreensaver or equivalent has locked the system? If so, that's a security vulnerability. So I'm dubious about its value for anything that isn't an absolutely critical alert. Well, there's at least two use-cases I can think of: * screen locking, as in screen savers; * login screens; * exam software; Eh, that is, at least three use-cases: * screen locking; * login screens; * exam software; * emulating full screen arcade games; Um, among the use-cases are, screen locking, login screens, exam software, full-screen games, critical system alerts, and, of course, the most popular reason of all: * my application is SO SPECIAL that it deserves to take over the entire GUI Just Because I Can. I don't know any platform-independent GUI toolkits which offer this out of the box, but I expect that there's probably a way to do it in a platform specific way on each platform you wish to support. Either that, or the OP can google for wxpython system modal (including the quotes) and see what comes up. I'd do so myself, except some damn fool Javascript code running on some rubbish web site just crashed my browser. Again. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
Steven D'Aprano steve+comp.lang.pyt...@pearwood.info: Does that work when xscreensaver or equivalent has locked the system? If so, that's a security vulnerability. Depends on the semantics of the screensaver. Its scope is the current X11 session. In my home, different family members have different VTs. Locking one VT shouldn't prevent you from switching over to a different one. Marko -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
Paul Wolf wrote:
This is a proposal with a working implementation for a random string
generation template syntax for Python. `strgen` is a module for generating
random strings in Python using a regex-like template language. Example:
from strgen import StringGenerator as SG
SG([\l\d]{8:15}[\d][\p]).render()
u'F0vghTjKalf4^mGLk'
Nice! Although very specialised :-)
I second what Ned and Chris have to say.
If you look at various forums, like Stackoverflow, on how to generate
random strings with Python, especially for passwords and other hopefully
secure tokens, you will see dozens of variations of this:
[...]
There is nothing wrong with this (it's the right answer and is very fast),
but it leads developers to constantly:
* Use cryptographically weak methods
* Forget that the above does not guarantee a result that includes the
different classes of characters
* Doesn't include variable length or minimum length output
* It's a lot of typing and the resulting code is vastly different each
time making it hard to understand what features were
implemented, especially for those new to the language
* You can extend the above to include whatever requirements you want,
but it's a constant exercise in wheel reinvention that is extremely
verbose, error prone and confusing for exactly the same purposes
each time
So, there's nothing wrong with it, except for the five things you list which
are wrong with it :-)
Seriously, if you're going to compete with the Stackoverflow ad hoc
solutions, you have to be more assertive that there is a problem with the
ad hoc solutions.
--
Steven
--
https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Fri, Aug 8, 2014 at 11:58 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Chris Angelico wrote: Yeah; like I said, Don't is the short answer. There will be exceptions, some extremely rare situations when system modality is correct; but fundamentally, it's impossible to use GUI software to control what a person does with a computer There are exceptions, but it's impossible? Impossible except for the exceptions, I presume :-P There are exceptions to the rule you shouldn't use system modal windows. It is, however, fundamentally impossible for GUI software to completely control what the person does - system modality is defined only to the extent of the GUI. (for instance, on all my Linux systems, I can hit Ctrl-Alt-F1 to switch away from the GUI altogether). Does that work when xscreensaver or equivalent has locked the system? If so, that's a security vulnerability. Absolutely it works! However, what you get to is a terminal with a login prompt. If you don't know a valid userid and password, you can't get in. (And if you *do* know them, you can probably get in through the GUI, too, although it's possible for a screen saver to lock such that no other account can log in.) So I'm dubious about its value for anything that isn't an absolutely critical alert. Well, there's at least two use-cases I can think of: * screen locking, as in screen savers; * login screens; With these two, it's deliberately locking only the GUI, so system modality could be correct. But really, it's more about covering the whole screen; system modality is more about disabling the whole screen. So they're still not a perfect match. * exam software; This is what I'm dubious about. Since you can always log in via some other method, or brute-force something (eg replace one of the system accessibility programs with your own tool), it's impossible for the software to stop you from running something else. And if the computer you're doing this on is so locked down that you can't pull up your notes in some other app, it may as well simply be so locked down that you can't get your notes onto that computer in the first place. * emulating full screen arcade games; Why should that disable access to everything else? Most full screen games let you alt-tab away from them (preferably auto-pausing the game). If a game goes system modal on me, I would not be happy. * my application is SO SPECIAL that it deserves to take over the entire GUI Just Because I Can. And that one is definitely not a reason, as I'm sure you agree :) I don't know any platform-independent GUI toolkits which offer this out of the box, but I expect that there's probably a way to do it in a platform specific way on each platform you wish to support. There may be; there also may not (that is to say, there may be platform-specific ways on some, but not all, platforms - I'm not sure Windows has the functionality). But that's par for the course... if every platform had the exact same features, we wouldn't need multiple platforms. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Friday, August 8, 2014 7:21:35 PM UTC+5:30, Chris Angelico wrote: On Fri, Aug 8, 2014 at 11:44 PM, Rustom Mody wrote: On Thursday, August 7, 2014 4:54:09 PM UTC+5:30, Jaydeep Patil wrote: Hi all, I have one query. I have did some programming which copies and paste data using system clipboard. I need to keep one GUI always on top till my python code is running. In linux you can do (at shell level) $ wmctrl -r window -b add,above AIUI that just sets the always on top flag, which isn't what he's asking for. Also, his toolkit should offer that directly. A windows equivalent for linux's wmctrl seems to be nir http://www.nirsoft.net/utils/nircmd2.html#using Search for 'settopmost' -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Sat, Aug 9, 2014 at 12:23 AM, Rustom Mody rustompm...@gmail.com wrote: A windows equivalent for linux's wmctrl seems to be nir http://www.nirsoft.net/utils/nircmd2.html#using Search for 'settopmost' No need; both of those are just setting the always on top flag, which wxpython can do directly. It may be unobvious, as there seem to be a lot of questions asked about it (lots of StackOverflow and forums posts), but ultimately, there's a wx.STAY_ON_TOP flag that will do the same thing. However, the OP wasn't asking about visually keeping a window on top, which is pretty easy. Trying to actually prevent access to any other window is significantly harder to do, plus it's never going to be more broad than one X session, plus it's almost always a bad UI idea. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
One suggestion, though perhaps nothing actually needs changing. I occasionally run into sites which define their password constraints as something like minimum 8 characters, at least one number, one uppercase letter, and one special character. Their notion of special (which in my mind means any printable character which isn't a letter, whitespace, or digit) is only a subset. You include a / or a ; and they kick your nice random password back at you, sometimes without telling you what you actually did wrong, only repeating, minimum 8 characters, at least one number and one special character. You are left to discover through trial-and-error which special characters are actually allowed. Once you figure that out, I suppose you could use something like [.-,()@] or whatever is actually allowed, but it would be nice if perhaps there was a way to figure out what some of these sites actually mean by special characters and define a \-escape which represents the lowest common denominator set of special characters. Definitely a small point though. Skip P.S. Probably a topic for a separate thread, and not actually Python-related, but on a related note, I have never found a free password keeper which works on all my platforms (Mac, Android, Unix). That is one stumbling block (for me) to actually using extremely strong passwords. If you have some thoughts, please contact me off-list. -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Friday, August 8, 2014 8:04:05 PM UTC+5:30, Chris Angelico wrote: On Sat, Aug 9, 2014 at 12:23 AM, Rustom Mody wrote: A windows equivalent for linux's wmctrl seems to be nir http://www.nirsoft.net/utils/nircmd2.html#using Search for 'settopmost' No need; both of those are just setting the always on top flag, which wxpython can do directly. It may be unobvious, as there seem to be a lot of questions asked about it (lots of StackOverflow and forums posts), but ultimately, there's a wx.STAY_ON_TOP flag that will do the same thing. However, the OP wasn't asking about visually keeping a window on top, which is pretty easy. Trying to actually prevent access to any other window is significantly harder to do, plus it's never going to be more broad than one X session, plus it's almost always a bad UI idea. This is the OP: I have one query. I have did some programming which copies and paste data using system clipboard. I need to keep one GUI always on top till my python code is running. [I am of course assuming that 'did' means 'done' and 'GUI' means 'window' or 'widget'] I dont see anything about preventing access. -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Fri, 08 Aug 2014 23:58:56 +1000, Steven D'Aprano wrote: (for instance, on all my Linux systems, I can hit Ctrl-Alt-F1 to switch away from the GUI altogether). Does that work when xscreensaver or equivalent has locked the system? If so, that's a security vulnerability. I have not tried b=ut is should not be a security risk as you still have to log into the virtual terminal. this may even be desirable if multiple people may administer the PC. -- I never met a piece of chocolate I didn't like. -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Friday, August 8, 2014 8:22:47 PM UTC+5:30, Chris Angelico wrote: On Sat, Aug 9, 2014 at 12:45 AM, Rustom Mody wrote: I dont see anything about preventing access. That came from his next post, in which he said So that user cant do any other operation.. That's the preventing access bit. Of course, if Always On Top is sufficient, then it's (a) easy, even across platforms, and (b) not the UI annoyance that misused system modality would be. There's plenty of use for always-on-top. Um... Ok Now I seem to remember this same questioner (??) asking a few months ago about: I have an excel program running for 20 minutes and I want to lock the machine or something like that And you proscribing similarly then :-) Yeah 'On top' can be useful. 'Modal' is a PITA. -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Sat, Aug 9, 2014 at 12:50 AM, alister alister.nospam.w...@ntlworld.com wrote: On Fri, 08 Aug 2014 23:58:56 +1000, Steven D'Aprano wrote: (for instance, on all my Linux systems, I can hit Ctrl-Alt-F1 to switch away from the GUI altogether). Does that work when xscreensaver or equivalent has locked the system? If so, that's a security vulnerability. I have not tried b=ut is should not be a security risk as you still have to log into the virtual terminal. this may even be desirable if multiple people may administer the PC. Right. Unix has as its underlying philosophy that users and processes are the most important things, not interfaces. I can log in to a computer at a virtual terminal by pressing Ctrl-Alt-F1, or with a graphical login manager like lightdm, or via ssh, or something else, and everything works. And if I leave something running under my user name that allows me to connect remotely, or maybe have something running as root that can hook in to some sort of user event (off a USB device, or a secondary mouse, or whatever) that can then display something on the screen, then no amount of login prevention will change that. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Sat, Aug 9, 2014 at 12:45 AM, Rustom Mody rustompm...@gmail.com wrote: I dont see anything about preventing access. That came from his next post, in which he said So that user cant do any other operation.. That's the preventing access bit. Of course, if Always On Top is sufficient, then it's (a) easy, even across platforms, and (b) not the UI annoyance that misused system modality would be. There's plenty of use for always-on-top. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Sat, Aug 9, 2014 at 12:58 AM, Rustom Mody rustompm...@gmail.com wrote: Now I seem to remember this same questioner (??) asking a few months ago about: I have an excel program running for 20 minutes and I want to lock the machine or something like that And you proscribing similarly then :-) Yeah 'On top' can be useful. 'Modal' is a PITA. Yeah, that sounds about right. Always on top, incidentally, is very often used for windows which won't have input focus - maybe a small window showing a status graph, or maybe a short-lived popup alert - rather than as a means of keeping the user's attention on something. But whatever it's used for, it doesn't affect input focus. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Specifying `blocking` and `timeout` when acquiring lock as a context manager
On 8/8/2014 9:25 AM, Ethan Furman wrote: On 08/08/2014 04:51 AM, cool-RR wrote: If I want to acquire a `threading.Lock` using the context manager protocol, is it possible to specify the `blocking` and `timeout` arguments that `acquire` would usually take? Not that I know of, but why would you want to? There's no built-in 'if' with a 'with' block -- how would your code know whether it ran or not? Perhaps defer release, a la a common Go pattern: with contextlib.ExitStack() as stack: acquired = lock.acquire(blocking=False) if acquired: stack.callback(lock.release) do_stuff -- Neil Cerutti -- https://mail.python.org/mailman/listinfo/python-list
Re: Specifying `blocking` and `timeout` when acquiring lock as a context manager
On Sat, Aug 9, 2014 at 2:05 AM, Neil D. Cerutti ne...@norwich.edu wrote: Perhaps defer release, a la a common Go pattern: with contextlib.ExitStack() as stack: acquired = lock.acquire(blocking=False) if acquired: stack.callback(lock.release) do_stuff There's a race condition in that - an unexpected exception could happen between those two. Are you able to set the callback to be a release if acquired atomic operation? ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
Chris Angelico wrote: On Fri, Aug 8, 2014 at 11:58 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Chris Angelico wrote: Yeah; like I said, Don't is the short answer. There will be exceptions, some extremely rare situations when system modality is correct; but fundamentally, it's impossible to use GUI software to control what a person does with a computer There are exceptions, but it's impossible? Impossible except for the exceptions, I presume :-P There are exceptions to the rule you shouldn't use system modal windows. It is, however, fundamentally impossible for GUI software to completely control what the person does - system modality is defined only to the extent of the GUI. *Fundamentally* impossible? You've never used classic Mac OS, I take it. Or a non-jail-broken iPhone. There is nothing *fundamental* that says that a GUI interface is necessarily a second-class interface, or that a non-GUI interface is always available. (for instance, on all my Linux systems, I can hit Ctrl-Alt-F1 to switch away from the GUI altogether). You're assuming that there are any virtual terminals running on the system, which is not a given. Windows doesn't have them at all. Even in Linux, they can be turned off(?) or at least access to them disabled. For that matter, you're assuming the machine has a keyboard attached. Have you never seen a machine running in kiosk mode with only a touchscreen or trackball? http://wiki.tldp.org/Kiosk-HOWTO Does that work when xscreensaver or equivalent has locked the system? If so, that's a security vulnerability. Absolutely it works! However, what you get to is a terminal with a login prompt. I don't think so. I think you get a terminal which may or may not be already logged in. Hence the security vulnerability: if you leave a virtual terminal logged in, then locking the X terminal alone via xscreensaver is useless. I haven't tried it with xscreensaver itself, but I've just tried it with whatever screensaver KDE under Centos uses, and sure enough, it locks the X session but allows access to any virtual terminals that happen to already be logged in with no authentication needed. [...] * exam software; This is what I'm dubious about. Since you can always log in via some other method, Always? You're saying it is impossible to disable telnet and ssh? Or unplug the network cable? But really, now we're getting silly. No, exam software isn't going to prevent you from ssh'ing into the computer from another computer, assuming ssh is allowed. Nor is it going to prevent you from using another computer, getting answers from handwritten notes or books, or asking somebody to help you. That's hardly the point. or brute-force something (eg replace one of the system accessibility programs with your own tool), And how am I supposed to do that, from the exam software itself, without access to a shell? it's impossible for the software to stop you from running something else. And if the computer you're doing this on is so locked down that you can't pull up your notes in some other app, it may as well simply be so locked down that you can't get your notes onto that computer in the first place. Um, yes? Although not necessarily. We're getting further and further from the OP's question, which should be interpreted in the most reasonable manner, not the least reasonable: - he probably only cares about blocking access to the rest of the GUI environment, not virtual terminals (assuming he is even using a system with virtual terminals); - or he's trying to build a kiosk application. It is unreasonable to interpret his comment user cant [sic] do any other operation so broadly that we have to care about (e.g.): - ssh'ing into the computer from another machine; - rebooting into single user mode; - walking away from the computer to do something else. All those things can be solved (e.g. by turning off the ssh daemon, or blocking access at the firewall, using a custom BIOS, and chaining the user to the computer), but likely not by the GUI toolkit itself. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Comparisons of Python's module/import system with JavaScript?
I'm struggling with some JavaScript issues related to it's lack of good support for modules. I know RequireJS exists (and appears to be the most widely used add-on for this stuff), but as a novice JS programmer, I'm having trouble wrapping my head around just what it does. In particular, I don't see how it injects names into the scope which calls require(). I'm hoping someone here understands both the Python and JS models (preferably as represented by RequireJS) and can provide some advice, perhaps a pointer to a blog post? I've not found anything yet. Thanks Skip -- https://mail.python.org/mailman/listinfo/python-list
Re: Specifying `blocking` and `timeout` when acquiring lock as a context manager
On 8/8/2014 12:16 PM, Chris Angelico wrote: On Sat, Aug 9, 2014 at 2:05 AM, Neil D. Cerutti ne...@norwich.edu wrote: Perhaps defer release, a la a common Go pattern: with contextlib.ExitStack() as stack: acquired = lock.acquire(blocking=False) if acquired: stack.callback(lock.release) do_stuff There's a race condition in that - an unexpected exception could happen between those two. Are you able to set the callback to be a release if acquired atomic operation? Doesn't any natural looking use of blocking=False suffer from the same race condition? What's the correct way to use it? Here's another attempt at context managing: @contextlib.contextmanager def release_if_acquired(lock, blocking=True, timeout=-1): acquired = lock.acquire(blocking, timeout) if acquired: yield acquired lock.release() else: yield acquired with release_if_acquired(lock, blocking=False) as acquired: if acquired: do_stuff -- Neil Cerutti -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
On Friday, August 8, 2014 10:35:12 AM UTC-4, Skip Montanaro wrote: One suggestion, though perhaps nothing actually needs changing. I occasionally run into sites which define their password constraints as something like minimum 8 characters, at least one number, one uppercase letter, and one special character. Their notion of special (which in my mind means any printable character which isn't a letter, whitespace, or digit) is only a subset. You include a / or a ; and they kick your nice random password back at you, sometimes without telling you what you actually did wrong, only repeating, minimum 8 characters, at least one number and one special character. You are left to discover through trial-and-error which special characters are actually allowed. Once you figure that out, I suppose you could use something like [.-,()@] or whatever is actually allowed, but it would be nice if perhaps there was a way to figure out what some of these sites actually mean by special characters and define a \-escape which represents the lowest common denominator set of special characters. Definitely a small point though. Skip P.S. Probably a topic for a separate thread, and not actually Python-related, but on a related note, I have never found a free password keeper which works on all my platforms (Mac, Android, Unix). That is one stumbling block (for me) to actually using extremely strong passwords. If you have some thoughts, please contact me off-list. Skip - try lastpass.com it's cross platform, include Win, Mac, Linux, Android and iOS. -- https://mail.python.org/mailman/listinfo/python-list
Re: Specifying `blocking` and `timeout` when acquiring lock as a context manager
On 8/8/2014 2:35 PM, Neil D. Cerutti wrote: Here's another attempt at context managing: @contextlib.contextmanager def release_if_acquired(lock, blocking=True, timeout=-1): acquired = lock.acquire(blocking, timeout) if acquired: yield acquired lock.release() else: yield acquired I should not have used a temporary. @contextlib.contextmanager def release_if_acquired(lock, blocking=True, timeout=-1): if lock.acquire(blocking, timeout) yield True lock.release() else: yield False -- Neil Cerutti -- https://mail.python.org/mailman/listinfo/python-list
Re: Specifying `blocking` and `timeout` when acquiring lock as a context manager
On Fri, Aug 8, 2014 at 11:35 AM, Neil D. Cerutti ne...@norwich.edu wrote: On 8/8/2014 12:16 PM, Chris Angelico wrote: On Sat, Aug 9, 2014 at 2:05 AM, Neil D. Cerutti ne...@norwich.edu wrote: Perhaps defer release, a la a common Go pattern: with contextlib.ExitStack() as stack: acquired = lock.acquire(blocking=False) if acquired: stack.callback(lock.release) do_stuff There's a race condition in that - an unexpected exception could happen between those two. Are you able to set the callback to be a release if acquired atomic operation? Doesn't any natural looking use of blocking=False suffer from the same race condition? What's the correct way to use it? Here's another attempt at context managing: @contextlib.contextmanager def release_if_acquired(lock, blocking=True, timeout=-1): acquired = lock.acquire(blocking, timeout) if acquired: yield acquired lock.release() else: yield acquired What I'd probably do is: @contextlib.contextmanager def release_if_acquired(lock, blocking=True, timeout=-1): acquired = lock.acquire(blocking, timeout) try: yield acquired finally: if acquired: lock.release() However, there is still the chance that a interrupt signal (ctrl+c) could prevent the lock from being released, but I think the only 100% solution would be to write the code in C where it cannot be interrupted within Python. The OS could still interrupt or kill the thread, but in that case, I don't think there is anything you can do... with release_if_acquired(lock, blocking=False) as acquired: if acquired: do_stuff -- https://mail.python.org/mailman/listinfo/python-list
Re: Specifying `blocking` and `timeout` when acquiring lock as a context manager
On Fri, Aug 8, 2014 at 7:25 AM, Ethan Furman et...@stoneleaf.us wrote:
On 08/08/2014 04:51 AM, cool-RR wrote:
If I want to acquire a `threading.Lock` using the context manager
protocol,
is it possible to specify the `blocking` and `timeout` arguments that
`acquire` would usually take?
Not that I know of, but why would you want to? There's no built-in 'if'
with a 'with' block -- how would your code know whether it ran or not?
@contextmanager
def locking(lock, blocking=False, timeout=-1):
try:
yield lock.acquire(blocking, timeout)
finally:
lock.release()
with locking(lock, timeout=5) as acquired:
if acquired:
print('yay!')
--
https://mail.python.org/mailman/listinfo/python-list
Newbie needing some help
I am trying to write a program that will loop through a text file and
delete rows in a mysql database.
It seemingly runs but I don't see anything getting deleted in the db.
Is there anything apparent that I am missing?
This is the code:
#!/usr/bin/python
import mysql.connector
#
f=open('/home/smithm/email-list.txt', 'r')
for line in f:
#do something with line
# Open database connection
db = mysql.connector.connect(user=xx, password=xx,
host=localhost, database=xx)
# prepare a cursor object using cursor() method
cursor = db.cursor()
# Prepare SQL query to DELETE required records
sql = DELETE FROM tblc_users WHERE user_email=%s, % (line)
try:
# Execute the SQL command
cursor.execute(sql)
# Commit your changes in the database
db.commit()
except:
# Rollback in case there is any error
db.rollback()
# disconnect from server
db.close()
--
Matthew Smith
--
https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
On Fri, Aug 8, 2014 at 3:07 PM, Matt Smith smit...@tblc.org wrote:
I am trying to write a program that will loop through a text file and delete
rows in a mysql database.
It seemingly runs but I don't see anything getting deleted in the db.
Is there anything apparent that I am missing?
This is the code:
#!/usr/bin/python
import mysql.connector
#
f=open('/home/smithm/email-list.txt', 'r')
for line in f:
#do something with line
# Open database connection
db = mysql.connector.connect(user=xx, password=xx,
host=localhost, database=xx)
# prepare a cursor object using cursor() method
cursor = db.cursor()
# Prepare SQL query to DELETE required records
sql = DELETE FROM tblc_users WHERE user_email=%s, % (line)
try:
# Execute the SQL command
cursor.execute(sql)
# Commit your changes in the database
db.commit()
except:
# Rollback in case there is any error
db.rollback()
# disconnect from server
db.close()
Run it in the debugger, set a BP after you create the sql, print it
out, and cut and paste it into an interactive sql session and you'll
see what the issues are.
--
https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
On 08/08/2014 20:07, Matt Smith wrote:
I am trying to write a program that will loop through a text file and
delete rows in a mysql database.
It seemingly runs but I don't see anything getting deleted in the db.
Is there anything apparent that I am missing?
This is the code:
#!/usr/bin/python
import mysql.connector
#
f=open('/home/smithm/email-list.txt', 'r')
The modern idiom is:-
with open(...) as f: but that doesn't matter here.
for line in f:
#do something with line
# Open database connection
db = mysql.connector.connect(user=xx, password=xx,
host=localhost, database=xx)
# prepare a cursor object using cursor() method
cursor = db.cursor()
Are you aware that you're connecting to your db and setting up the
cursor in every iteration of the loop?
# Prepare SQL query to DELETE required records
sql = DELETE FROM tblc_users WHERE user_email=%s, % (line)
try:
# Execute the SQL command
cursor.execute(sql)
# Commit your changes in the database
db.commit()
except:
This bare except is masking every possible thing that can go wrong.
Strip it out and I expect you'll find your mistake in seconds. Once
you've corrected your code add back in the bare minimum number of
exceptions that you really should catch.
# Rollback in case there is any error
db.rollback()
# disconnect from server
db.close()
--
Matthew Smith
--
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: Template language for random string generation
On Fri, Aug 8, 2014 at 3:01 AM, Paul Wolf paulwolf...@gmail.com wrote: * Uses SystemRandom class (if available, or falls back to Random) A simple improvement would be to also allow the user to pass in a Random object, in case they have their own source of randomness they want to use, or for fake Randoms used for writing unit tests that invoke strgen. Have you given any thought to adding a validation mode, where the user provides a template and a string and wants to know if the string matches the template? -- https://mail.python.org/mailman/listinfo/python-list
Re: Template language for random string generation
On 08/08/2014 01:45 PM, cwolf.a...@gmail.com wrote: On Friday, August 8, 2014 10:35:12 AM UTC-4, Skip Montanaro wrote: P.S. Probably a topic for a separate thread, and not actually Python-related, but on a related note, I have never found a free password keeper which works on all my platforms (Mac, Android, Unix). That is one stumbling block (for me) to actually using extremely strong passwords. If you have some thoughts, please contact me off-list. Skip - try lastpass.com it's cross platform, include Win, Mac, Linux, Android and iOS. LastPass is pretty nice (and I use it on Windows, Mac, Linux and Android myself), but the mobile versions aren't free: https://lastpass.com/misc_download2.php -- https://mail.python.org/mailman/listinfo/python-list
Re: Keep one GUI always on TOP while python code is running
On Sat, Aug 9, 2014 at 4:04 AM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Chris Angelico wrote: On Fri, Aug 8, 2014 at 11:58 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Chris Angelico wrote: Yeah; like I said, Don't is the short answer. There will be exceptions, some extremely rare situations when system modality is correct; but fundamentally, it's impossible to use GUI software to control what a person does with a computer There are exceptions, but it's impossible? Impossible except for the exceptions, I presume :-P There are exceptions to the rule you shouldn't use system modal windows. It is, however, fundamentally impossible for GUI software to completely control what the person does - system modality is defined only to the extent of the GUI. *Fundamentally* impossible? You've never used classic Mac OS, I take it. Or a non-jail-broken iPhone. There is nothing *fundamental* that says that a GUI interface is necessarily a second-class interface, or that a non-GUI interface is always available. What I mean is that GUI software can't control the entire computer. It's impossible for a system-modal flag to prevent access to non-GUI parts of the computer. Now, if there happen to be none of them (that you're aware of - certain OSes are rife with unexpected backdoors), then for all practical purposes, it's controlling the whole computer - but technically it still isn't. You're assuming that there are any virtual terminals running on the system, which is not a given. Windows doesn't have them at all. Even in Linux, they can be turned off(?) or at least access to them disabled. For that matter, you're assuming the machine has a keyboard attached. Have you never seen a machine running in kiosk mode with only a touchscreen or trackball? http://wiki.tldp.org/Kiosk-HOWTO This is what I was saying about the system being so locked down already that there's no point going system modal. If you can't invoke other programs, what's it matter if you could switch to other running programs? So system modality is still pointless on a kiosk. Does that work when xscreensaver or equivalent has locked the system? If so, that's a security vulnerability. Absolutely it works! However, what you get to is a terminal with a login prompt. I don't think so. I think you get a terminal which may or may not be already logged in. Hence the security vulnerability: if you leave a virtual terminal logged in, then locking the X terminal alone via xscreensaver is useless. I haven't tried it with xscreensaver itself, but I've just tried it with whatever screensaver KDE under Centos uses, and sure enough, it locks the X session but allows access to any virtual terminals that happen to already be logged in with no authentication needed. Oh, sorry. I thought you were talking about the oops you got around my security problem. If you leave something logged in, that's a security vulnerability; whether that's on a VT or in a web browser tab, someone (you or someone else) can then use it. As far as I'm concerned, the vulnerability has nothing to do with a locked GUI. If you're trying to ensure that someone can't get around your program, you have to make sure there's no available logins. [...] * exam software; This is what I'm dubious about. Since you can always log in via some other method, Always? You're saying it is impossible to disable telnet and ssh? Or unplug the network cable? I'm assuming here that the student has some control of the computer the software's being run on. If the student has absolutely no control over the computer, then it's the kiosk situation; there's no point locking the GUI because you'll already have locked everything else. What you're basically saying is Hey look, I have a perfect lock on my front door - backed up by a moat full of angry crocodiles. The crocs make the lock superfluous. or brute-force something (eg replace one of the system accessibility programs with your own tool), And how am I supposed to do that, from the exam software itself, without access to a shell? Again, this would be something you'd do beforehand, making use of some measure of control over the computer. If you can't do anything like that, it's kiosk mode. I'm thinking here of the time I had a Windows 7 VM that I'd forgotten the password to. The solution? Boot a rescue disk (I could probably have done this with a Linux live CD and an ntfs mount), copy cmd.exe over the top of some accessibility program (backing it up first), and reboot. The same can be done with Linux; if you can boot your own media, you can change anything and give yourself access (put yourself in sudoers, give yourself some groups, create a setuid root shell, etc, etc, etc). So the *only* way to prevent access to a physical machine is to prevent *all* access. And at that point, any lesser control is utterly superfluous. We're getting further and further from the OP's question,
Re: Newbie needing some help
On Sat, Aug 9, 2014 at 5:07 AM, Matt Smith smit...@tblc.org wrote: # Prepare SQL query to DELETE required records sql = DELETE FROM tblc_users WHERE user_email=%s, % (line) try: # Execute the SQL command cursor.execute(sql) # Commit your changes in the database db.commit() except: # Rollback in case there is any error db.rollback() By not even logging your errors, you mask everything that could go wrong. There is an error in the block of code that I've highlighted here, but the biggest problem is the bare except (as Mark pointed out). Suggestions: 1) Use a better subject line, which actually describes your problem. 2) As Mark said, don't use try/except here at all. Let exceptions abort the whole process with a nice useful traceback. 3) Open a database connection once, right at the top, and don't commit until the very end of your program. 4) If this isn't a toy program, consider doing the entire set of deletions in a single statement - it'll allow the database to do a single pass over the data. But if this is part of a learn to use SQL course or something, ignore that, keep going the way you are. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Specifying `blocking` and `timeout` when acquiring lock as a context manager
On Sat, Aug 9, 2014 at 4:35 AM, Neil D. Cerutti ne...@norwich.edu wrote: Doesn't any natural looking use of blocking=False suffer from the same race condition? What's the correct way to use it? Actually, I don't know. I try to avoid any form of thread locking where possible, and I don't remember the last time I used blocking=False at all. Generally, in those rare occasions when I want to lock, I want to lock reliably, and it's around something so narrow that the simple option will be the best. So you're quite probably right. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
On Fri, Aug 8, 2014 at 12:07 PM, Matt Smith smit...@tblc.org wrote:
I am trying to write a program that will loop through a text file and
delete rows in a mysql database.
It seemingly runs but I don't see anything getting deleted in the db.
Is there anything apparent that I am missing?
This is the code:
#!/usr/bin/python
import mysql.connector
#
f=open('/home/smithm/email-list.txt', 'r')
You probably should use the with statement to make sure the file closes,
like follows:
with open('/home/smithm/email-list.txt', 'r') as f:
# Code needing the file goes here.
for line in f:
#do something with line
# Open database connection
db = mysql.connector.connect(user=xx, password=xx,
host=localhost, database=xx)
# prepare a cursor object using cursor() method
cursor = db.cursor()
You probably want you connect to the database outside the line for
performance reasons.
# Prepare SQL query to DELETE required records
sql = DELETE FROM tblc_users WHERE user_email=%s, % (line)
This line also seems suspect - you are not merging in the line to the SQL
statement. If you meant:
sql = DELETE FROM tblc_users WHERE user_email=%s % (line)
you would have a SQL injection attack possible. The sql library should have
support for this type of loading the code. I do not know the exact syntax
for how to do this within the mysql connector library, but typically you
pass the arguments to the execute command (in this case, line) with some
formatting in the sql command line..
try:
# Execute the SQL command
cursor.execute(sql)
# Commit your changes in the database
db.commit()
except:
As a heads up, bare exceptions are generally a bad idea, however in this
case they are acceptable.
However, I'd recommend re-raising the exception after rolling back the
transaction with a bare raise statement right after the db.rollback() -
at the absolute minimum, you should log the error. This will likely let you
see what your problem is.
# Rollback in case there is any error
db.rollback()
I'd probably put the close inside of a finally block (especially if you
re-raise the exception as suggested above).
# disconnect from server
db.close()
Overall, I'd suggest restructing your code to look like (untested):
import mysql.connector
with open('/home/smithm/email-list.txt', 'r') as f:
# Open database connection
db = mysql.connector.connect(user=xx, password=xx,
host=localhost, database=xx)
try:
# prepare a cursor object using cursor() method
cursor = db.cursor()
for line in f:
#do something with line
# NOTE: the mysql library might support the with statement like
above, removing the need for the try...finally.
try:
# Prepare SQL query to DELETE required records
sql = DELETE FROM tblc_users WHERE user_email=%s ## --I
do not know if %s is the correct syntax for this library.--
# Execute the SQL command
cursor.execute(sql, line) ## --I do not know if this is the
correct syntax for this library.--
# Commit your changes in the database
db.commit()
except:
# Rollback in case there is any error
db.rollback()
raise
finally:
# disconnect from server
db.close()
Chris
--
https://mail.python.org/mailman/listinfo/python-list
Re: more simple to split the string?
Python 3.4.0 (v3.4.0:04f714765c13, Mar 16 2014, 19:25:23) [MSC v.1600 64
bit (AM
D64)] on win32
Type help, copyright, credits or license for more information.
str='(\\HasNoChildren \\Junk) / [Gmail]/V4NXPpCuTvY-'
str.split( )
['(\\HasNoChildren', '\\Junk)', '/', '[Gmail]/V4NXPpCuTvY-']
it can be split into four parts,you can see.
On 8/8/2014 1:43 AM, Mark Lawrence wrote:
On 08/08/2014 01:23, elearn wrote:
str='(\\HasNoChildren \\Junk) / [Gmail]/V4NXPpCuTvY-'
First up it's not usually a good idea to override the builtin name str.
x=str.split(' ')
[i.replace('','') for i in x]
['(\\HasNoChildren \\Junk)', '/', '[Gmail]/V4NXPpCuTvY-']
x.strip( ) will create four parts.
I assume you meant x=str.split( ) ? Even so I don't see how you can
get four parts so please explain.
is there more simple to do that ?
No loop needed that I can see.
oldstr='(\\HasNoChildren \\Junk) / [Gmail]/V4NXPpCuTvY-';oldstr
'(\\HasNoChildren \\Junk) / [Gmail]/V4NXPpCuTvY-'
newstr=oldstr.replace('', '');newstr
'(\\HasNoChildren \\Junk) / [Gmail]/V4NXPpCuTvY-'
substrings=newstr.split();substrings
['(\\HasNoChildren', '\\Junk)', '/', '[Gmail]/V4NXPpCuTvY-']
--
https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
On Sat, Aug 9, 2014 at 8:01 AM, Chris Kaynor ckay...@zindagigames.com wrote: However, I'd recommend re-raising the exception after rolling back the transaction with a bare raise statement right after the db.rollback() - at the absolute minimum, you should log the error. This will likely let you see what your problem is. AIUI, aborting the process with an uncaught exception would roll back implicitly, so there's no need to bare except, roll back, bare raise. But even if that's not the case, I would be looking at a try/finally for this, rather than a try/except/raise. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
On Sat, Aug 9, 2014 at 9:55 AM, Chris Kaynor ckay...@zindagigames.com wrote: try: action commit finally: rollback If commit/rollback automatically opens a new transaction, this would just roll back an empty transaction - not a big deal. But yes, I do see what you're looking at here. However, structures like this are necessary only if you're hanging onto the database connection. Python gives you a well-defined unhandled-exception handler, and it's easy to just let exceptions happen - if something goes wrong, you won't commit, and you'll get a helpful traceback on the console. My recommended model for Python databasing is: Create database connection, get cursor while work to do: do work Commit Until such time as you have a demonstrable need for more complexity, this model is safe, simple, and easy to work with. And less code generally means less bugs :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
On Sat, Aug 9, 2014 at 10:32 AM, Chris Kaynor ckay...@zindagigames.com wrote: The main issue I can see with that idea is that the exception will keep a reference to the database connection (as with all locals), so unless you explicitly close it within a finally clause, the database connection could still be left hanging, and thus no rollback will occur. To clarify: The simple example I used there was assumed to be the entire program, meaning that the process will terminate on exception. No worries about resource release then! This kind of model works nicely for anything that reads from one source and writes into the database, or processes data from the database back into the database, or anything like that. The general assumption is that an unexpected exception should be treated as fatal - just write to the console and terminate. While this might seem like the simplest 1% of cases, it's able to handle a lot of real-world situations. And since it takes no extra code, it's the perfect way to start :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Tkinter frame reset
Ok so I am working on a little project and I cant seem to solve something with it. I have a label and then a clear button and I want all the numbers in the label to clear when I push the button. This button is on a separate frame to the buttons. I would like to clear the frame and then set all the widgits back to how they were one you first open the app(Label being blank). I have tried to destroy it with frame.destry() and then try re create it in a function but it never recreates its self. Also when I tried grid_forget() on it, it never came back either when I tried to frame it and then grid it back on there. I can clear the label by just adding a long blank string to it to overwrite the numbers behind because I would like to have the user add more numbers in there like starting fresh. This long blank string wont work because the buttons add on to the existing string so the label keeps getting updated with the new buttons pressed. I tried to remove the label but that never came back either. Please help me with trying to clear the label or the whole window back to its original blank settings -- https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
On Fri, Aug 8, 2014 at 5:13 PM, Chris Angelico ros...@gmail.com wrote: On Sat, Aug 9, 2014 at 9:55 AM, Chris Kaynor ckay...@zindagigames.com wrote: try: action commit finally: rollback If commit/rollback automatically opens a new transaction, this would just roll back an empty transaction - not a big deal. But yes, I do see what you're looking at here. However, structures like this are necessary only if you're hanging onto the database connection. Python gives you a well-defined unhandled-exception handler, and it's easy to just let exceptions happen - if something goes wrong, you won't commit, and you'll get a helpful traceback on the console. My recommended model for Python databasing is: Create database connection, get cursor while work to do: do work Commit Until such time as you have a demonstrable need for more complexity, this model is safe, simple, and easy to work with. And less code generally means less bugs :) The main issue I can see with that idea is that the exception will keep a reference to the database connection (as with all locals), so unless you explicitly close it within a finally clause, the database connection could still be left hanging, and thus no rollback will occur. With just: openConnection while workToDo: doWork commit If at any time, doWork throws an exception, the connection could be left hanging, especially if the code is being run as an interactive script, and not as an application. I believe this is one case where explicit is better than implicit :) - its better to explicitly free the external resources, at the minimum, with something like: openConnection try: while worktoDo: doWork commit finally: closeConnection But, depending on the needs of the system (longer living connections, for example), that may need to have explicit rollback as well. As a rule of thumb, I have a context manger to deal with the specific needs (either just a with transition or a with connection). Keeps the code cleaner :). Chris -- https://mail.python.org/mailman/listinfo/python-list
how to get the ordinal number in list
x=[x1,x3,x7,x5] y=x3 how can i get the ordinal number by some codes? for id ,value in enumerate(x): if y==value : print(id) Is more simple way to do that? -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the ordinal number in list
On Sat, Aug 9, 2014 at 1:22 PM, luofeiyu elearn2...@gmail.com wrote: x=[x1,x3,x7,x5] y=x3 how can i get the ordinal number by some codes? for id ,value in enumerate(x): if y==value : print(id) Is more simple way to do that? print x.index(y) -- https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
On Fri, Aug 8, 2014 at 4:38 PM, Chris Angelico ros...@gmail.com wrote: On Sat, Aug 9, 2014 at 8:01 AM, Chris Kaynor ckay...@zindagigames.com wrote: However, I'd recommend re-raising the exception after rolling back the transaction with a bare raise statement right after the db.rollback() - at the absolute minimum, you should log the error. This will likely let you see what your problem is. AIUI, aborting the process with an uncaught exception would roll back implicitly, so there's no need to bare except, roll back, bare raise. But even if that's not the case, I would be looking at a try/finally for this, rather than a try/except/raise. I would imagine that on connection close, the server would rollback any uncommitted transactions, however that presumes that the connection close is completed in a reasonably timely manner (with a try...finally for closing, it should be). This is one case where I think try...except/raise is better than try...finally. If you use try...finally to rollback, you'd have to either track whether you committed, or you'd rollback with no actions (or possibly a committed action, which could have odd behavior, depending on the implementation) try: action commit except: rollback raise I feel is better than: try: action commit finally: rollback or: success = False try: action commit success = True finally: if success: rollback and is very different than: try: action finally: commit -- https://mail.python.org/mailman/listinfo/python-list
how to print with given font and size?
print(hallo) is so simple. how can print word hallo in console with courier New font 16 pound? -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the ordinal number in list
x=[x1,x3,x7,x5,x3] x.index(x3) 1 if i want the result of 1 and 4 ? On 8/8/2014 7:25 PM, Larry Martell wrote: On Sat, Aug 9, 2014 at 1:22 PM, luofeiyu elearn2...@gmail.com wrote: x=[x1,x3,x7,x5] y=x3 how can i get the ordinal number by some codes? for id ,value in enumerate(x): if y==value : print(id) Is more simple way to do that? print x.index(y) -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the ordinal number in list
On Sun, Aug 10, 2014 at 3:35 AM, luofeiyu elearn2...@gmail.com wrote: x=[x1,x3,x7,x5,x3] x.index(x3) 1 if i want the result of 1 and 4 ? Want to know what you can do with some object? Try this: help(x) In this case, though, I suspect there's no built-in to search for *all* of the occurrences of something, so you're best doing your own loop. You can either iterate straight over the list with enumerate, as you were doing, or you can use index() with its start argument: def find_all(lst, obj): indices = [-1] try: while True: indices.append(lst.index(obj, indices[-1]+1)) except ValueError: return indices[1:] x=[x1,x3,x7,x5,x3] find_all(x, x3) [1, 4] It's probably cleaner to just iterate over the list once, though, and you already know how to do that. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: how to print with given font and size?
On Sun, Aug 10, 2014 at 3:33 AM, luofeiyu elearn2...@gmail.com wrote: print(hallo) is so simple. how can print word hallo in console with courier New font 16 pound? You'd have to look to your console's settings; generally, you can't change fonts. For that kind of work, what you want is an actual GUI; there are a number of good Python GUI toolkits, including PyGTK, Tkinter, wxPython, PyQt, and others. Pick one (Tkinter's probably a good choice for starting out, as it comes with Python on several platforms; personally, I quite like GTK; but really, any will do), and work through its tutorial, which should take you through a basic graphical Hello, World. But at a regular console, you don't have fonts - all you have is a stream of text. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
In mailman.12762.1407533916.18130.python-l...@python.org Matt Smith
smit...@tblc.org writes:
I am trying to write a program that will loop through a text file and
delete rows in a mysql database.
It seemingly runs but I don't see anything getting deleted in the db.
Is there anything apparent that I am missing?
This is the code:
#!/usr/bin/python
import mysql.connector
#
f=open('/home/smithm/email-list.txt', 'r')
for line in f:
#do something with line
# Open database connection
db = mysql.connector.connect(user=xx, password=xx,
host=localhost, database=xx)
# prepare a cursor object using cursor() method
cursor = db.cursor()
As others have said, this code connects to the database and prepares
a cursor *every time* through the loop. You probably only want to
do those things once.
# Prepare SQL query to DELETE required records
sql = DELETE FROM tblc_users WHERE user_email=%s, % (line)
You don't have the sql command constructed quite right. As written, the
sql command will be, literally:
DELETE FROM tblc_users WHERE user_email=%s, % (line)
And of course that likely won't match anything. (As a very simple debugging
step, you could have printed the sql statement each time through the loop.
That would have alerted you immediately as to what was going on.)
You probably meant something like this instead:
sql = DELETE FROM tblc_users WHERE user_email=%s % line
This will substitute the value of line for the %s.
However, most (all?) SQL databases require string values to be enclosed
in single quotes, and your databse likely defines user_email as a string
value. So you probably actually want something like this:
sql = DELETE FROM tblc_users WHERE user_email='%s' % line
And even this solution isn't very good, because it allows SQL injection
attacks if your text file contains something nasty. If this is anything
other than a toy program, please take the time to look up prepared
statements.
try:
# Execute the SQL command
cursor.execute(sql)
# Commit your changes in the database
db.commit()
except:
# Rollback in case there is any error
db.rollback()
Again, as others have said, using a bare 'except:' statement will catch
and hide any possible error, leaving you mystified as to why nothing
happened.
# disconnect from server
db.close()
--
John Gordon Imagine what it must be like for a real medical doctor to
gor...@panix.comwatch 'House', or a real serial killer to watch 'Dexter'.
--
https://mail.python.org/mailman/listinfo/python-list
how to write file into my android phone?
When i input usb line with my android phone into the pc , there are two disks j: and k: (type :removable disk) displayed in win7. i can get my android phone bluetooth mac address . import bluetooth nearby_devices = bluetooth.discover_devices(lookup_names = True) for addr, phoneName in nearby_devices: print(addr) it is 6C:8B:2F:CE:5B:59 Now how can i write a file into the disk j: of my android phone(bluetooth mac is 6C:8B:2F:CE:5B:59 )? -- https://mail.python.org/mailman/listinfo/python-list
Re: Newbie needing some help
On Sat, Aug 9, 2014 at 12:51 PM, John Gordon gor...@panix.com wrote: You probably meant something like this instead: sql = DELETE FROM tblc_users WHERE user_email=%s % line This will substitute the value of line for the %s. However, most (all?) SQL databases require string values to be enclosed in single quotes, and your databse likely defines user_email as a string value. So you probably actually want something like this: sql = DELETE FROM tblc_users WHERE user_email='%s' % line And even this solution isn't very good, because it allows SQL injection attacks if your text file contains something nasty. If this is anything other than a toy program, please take the time to look up prepared statements. All SQL databases require strings to be quoted (it's part of the SQL spec), although some broken database engines (which I shall not name) do allow other forms of quote than the apostrophe. But I would advise against even suggesting the interpolation method; there's absolutely no reason ever to do this sort of thing - it's just way too fragile. (Even if you think you can get it perfectly right now, do you really want to inflict the headache on the code's next maintainer?) Parameterized queries are a part of the Python database API, so go ahead and use them. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the ordinal number in list
luofeiyu wrote: x=[x1,x3,x7,x5,x3] x.index(x3) 1 if i want the result of 1 and 4 ? def index_all(source, target): results = [] for i, obj in enumerate(source): if obj == target: results.append(i) return results index_all(x, x3) = returns [1, 3] -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the ordinal number in list
On Saturday, August 9, 2014 8:36:28 AM UTC+5:30, Steven D'Aprano wrote: luofeiyu wrote: x=[x1,x3,x7,x5,x3] x.index(x3) 1 if i want the result of 1 and 4 ? def index_all(source, target): results = [] for i, obj in enumerate(source): if obj == target: results.append(i) return results index_all(x, x3) = returns [1, 3] Heh! And the OP asked for a simplification! def index_all(lst, val): return (i for i,v in enumerate(lst) if v == val) ... index_all(abcdeaga, a) generator object genexpr at 0x7f21884797d0 list(index_all(abcdeaga, a)) [0, 5, 7] [To the OP] Yeah I am in the minority at least out here in considering comprehensions simpler than loops. Take your pick -- https://mail.python.org/mailman/listinfo/python-list
[issue22157] FAIL: test_with_pip (test.test_venv.EnsurePipTest)
snehal added the comment: 1oot@beta1:/home/ubuntu/python/Python-3.4.1# cd /home/ubuntu/python/Python-3.4. esot@beta1:/home/ubuntu/python/Python-3.4.1# ./python -E -S -m test -v test_ctyp == CPython 3.4.1 (default, Aug 7 2014, 02:08:49) [GCC 4.8.2] == Linux-3.13.0-32-generic-ppc64le-with-debian-jessie-sid little-endian == hash algorithm: siphash24 64bit == /home/ubuntu/python/Python-3.4.1/build/test_python_1245 Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=1, ignore_environment=1, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0) [1/1] test_ctypes test_ctypes skipped -- No module named '_ctypes' 1 test skipped: test_ctypes - == CPython 3.4.1 (default, Aug 7 2014, 02:08:49) [GCC 4.8.2]-m test -v test_venv == Linux-3.13.0-32-generic-ppc64le-with-debian-jessie-sid little-endian == hash algorithm: siphash24 64bit == /home/ubuntu/python/Python-3.4.1/build/test_python_1248 Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=1, ignore_environment=1, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0) [1/1] test_venv test_defaults (test.test_venv.BasicTest) ... ok test_executable (test.test_venv.BasicTest) ... ok test_executable_symlinks (test.test_venv.BasicTest) ... ok test_isolation (test.test_venv.BasicTest) ... ok test_overwrite_existing (test.test_venv.BasicTest) ... ok test_prefixes (test.test_venv.BasicTest) ... ok test_symlinking (test.test_venv.BasicTest) ... ok test_unoverwritable_fails (test.test_venv.BasicTest) ... ok test_upgrade (test.test_venv.BasicTest) ... ok test_devnull_exists_and_is_empty (test.test_venv.EnsurePipTest) ... ok test_explicit_no_pip (test.test_venv.EnsurePipTest) ... ok test_no_pip_by_default (test.test_venv.EnsurePipTest) ... ok test_with_pip (test.test_venv.EnsurePipTest) ... FAIL == FAIL: test_with_pip (test.test_venv.EnsurePipTest) -- Traceback (most recent call last): File /home/ubuntu/python/Python-3.4.1/Lib/test/test_venv.py, line 352, in test_with_pip with_pip=True) subprocess.CalledProcessError: Command '['/tmp/tmp1_atkzms/bin/python', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1 During handling of the above exception, another exception occurred: Traceback (most recent call last): File /home/ubuntu/python/Python-3.4.1/Lib/test/test_venv.py, line 358, in test_with_pip self.fail(msg.format(exc, details)) AssertionError: Command '['/tmp/tmp1_atkzms/bin/python', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1 **Subprocess Output** Traceback (most recent call last): File /home/ubuntu/python/Python-3.4.1/Lib/runpy.py, line 170, in _run_module_as_main __main__, mod_spec) File /home/ubuntu/python/Python-3.4.1/Lib/runpy.py, line 85, in _run_code exec(code, run_globals) File /home/ubuntu/python/Python-3.4.1/Lib/ensurepip/__main__.py, line 4, in module ensurepip._main() File /home/ubuntu/python/Python-3.4.1/Lib/ensurepip/__init__.py, line 209, in _main default_pip=args.default_pip, File /home/ubuntu/python/Python-3.4.1/Lib/ensurepip/__init__.py, line 116, in bootstrap _run_pip(args + [p[0] for p in _PROJECTS], additional_paths) File /home/ubuntu/python/Python-3.4.1/Lib/ensurepip/__init__.py, line 40, in _run_pip import pip File /tmp/tmplglzwy2e/pip-1.5.6-py2.py3-none-any.whl/pip/__init__.py, line 9, in module File /tmp/tmplglzwy2e/pip-1.5.6-py2.py3-none-any.whl/pip/log.py, line 9, in module File /tmp/tmplglzwy2e/pip-1.5.6-py2.py3-none-any.whl/pip/_vendor/colorama/__init__.py, line 2, in module File /tmp/tmplglzwy2e/pip-1.5.6-py2.py3-none-any.whl/pip/_vendor/colorama/initialise.py, line 5, in module File /tmp/tmplglzwy2e/pip-1.5.6-py2.py3-none-any.whl/pip/_vendor/colorama/ansitowin32.py, line 6, in module File /tmp/tmplglzwy2e/pip-1.5.6-py2.py3-none-any.whl/pip/_vendor/colorama/winterm.py, line 2, in module File /tmp/tmplglzwy2e/pip-1.5.6-py2.py3-none-any.whl/pip/_vendor/colorama/win32.py, line 7, in module File /home/ubuntu/python/Python-3.4.1/Lib/ctypes/__init__.py, line 7, in module from _ctypes import Union, Structure, Array ImportError: No module named '_ctypes' -- Ran 13 tests in 0.574s FAILED (failures=1) test test_venv failed 1 test failed: test_venv -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22157 ___ ___ Python-bugs-list mailing list Unsubscribe:
[issue22157] FAIL: test_with_pip (test.test_venv.EnsurePipTest)
Ned Deily added the comment: Thanks. So apparently the _ctypes module failed to build. You should rerun make in your build directory and find out why _ctypes.so fails to build. If necessary, show the results here. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22157 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Serhiy Storchaka added the comment: When the verbose variable is imported, it is impossible to control verbosity at runtime. It will be better to import only the test.support module itself and then access its attribute. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22170] Typo in iterator doc
Mark Lawrence added the comment: The comma is needed to prevent blank newlines being printed. Please try it for yourself. -- nosy: +BreamoreBoy ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22170 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Serhiy Storchaka added the comment: But this doesn't matter. The patch LGTM. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22172] Local files shadow system modules, even from system modules
New submission from Daniel Thomas:
In Python 3.4 (but not 3.2 or 2.7) when a system module does an import then
files with the same name in the directory of the original python script which
match that name are used.
E.g.
With a directory containing:
test.py:
#!/usr/bin/env python3
from collections import OrderedDict
print('do stuff')
operator.py:
#!/usr/bin/env python3
print('EXPLOIT!')
Running test.py will cause:
EXPLOIT!
Traceback (most recent call last):
File ./test.py, line 4, in module
from collections import OrderedDict
File /usr/lib/python3.4/collections/__init__.py, line 11, in module
from operator import itemgetter as _itemgetter, eq as _eq
ImportError: cannot import name 'itemgetter'
While test.py is perfectly innocent it is in the same directory as the nasty
operator.py and test.py makes no reference at all to operator.py but when
'collections' is imported it imports from operator which is resolved to
operator.py in the local directory
This is a security vulnerability because it is possible to verify that a python
script is safe to run by reading its code and then on running it find that
other code is implicitly loaded by the system libraries which is never
referenced in the original file or part of any of the standard libraries.
It is also rather confusing but a related issue is already filed for that in
issue21202.
This is similar to the standard name shadowing trap
http://python-notes.curiousefficiency.org/en/latest/python_concepts/import_traps.html#the-name-shadowing-trap
but now applies to other files in the source directory in a way which it
didn't in previous versions of python. I suspect this was introduced in python
3.3 through changes to the import system and __init__.py becoming optional but
I don't have a 3.3 install to check that with.
sys.path here is: ['/auto/homes/drt24/pythontest', '/usr/lib/python3.4',
'/usr/lib/python3.4/plat-x86_64-linux-gnu', '/usr/lib/python3.4/lib-dynload',
'/usr/local/lib/python3.4/dist-packages', '/usr/lib/python3/dist-packages']
Running Python 3.4.0-0ubuntu2 on Ubuntu 14.04.1 LTS with Linux 3.13.0-32-generic
--
components: Interpreter Core
messages: 225065
nosy: drt24
priority: normal
severity: normal
status: open
title: Local files shadow system modules, even from system modules
type: security
versions: Python 3.4
___
Python tracker rep...@bugs.python.org
http://bugs.python.org/issue22172
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22172] Local files shadow system modules, even from system modules
Nick Coghlan added the comment: This is not new behaviour. It's just normal system shadowing: $ python test.py Traceback (most recent call last): File test.py, line 1, in module import collections File /usr/lib64/python2.7/collections.py, line 9, in module from operator import itemgetter as _itemgetter, eq as _eq ImportError: cannot import name itemgetter Avoiding that behaviour is what the new isolated mode is for: $ ~/devel/py34/python -I test.py $ -- nosy: +ncoghlan resolution: - not a bug stage: - resolved status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22172 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21777] Separate out documentation of binary sequence methods
Nick Coghlan added the comment: v5 has all the review comments I accepted as being in scope addressed, including the restoration/addition of the notes about returning the object unchanged for center(), ljust(), rjust() and zfill() when the field width is less than or equal to the length of the string. -- Added file: http://bugs.python.org/file36309/separate_binary_sequence_docs_v5.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21777 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21777] Separate out documentation of binary sequence methods
Nick Coghlan added the comment: I think this is done now - absent any major objections, I'll push it live in a couple of days time. -- stage: patch review - commit review ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21777 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22167] iglob() has misleading documentation (does indeed store names internally)
Roy Smith added the comment: How about something like this: Note: The current iglob() implementation is optimized for the case of many files distributed in a large directory tree. Internally, it iterates over the directory tree, and stores all the names from each directory at once. This will lead to pathologically inefficient behavior when any individual directory has a large number of files in it. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22167 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22167] iglob() has misleading documentation (does indeed store names internally)
R. David Murray added the comment: IMO the documentation isn't *wrong*, just misleading :) What it is saying is that *your program* doesn't have to store the full list returned by iglob before being able to use it (ie: iglob doesn't return a list). It says nothing about what resources are used internally, other than an implied contract that there is *some* efficiency over calling glob; which, as explained above, there is. The fact that the implementation uses lots of memory if any single directory is large is then a performance bug, which can theoretically be fixed in 3.5 using scandir. The reason iglob was introduced, if you check the revision history, is that glob used to call itself recursively for each sub-directory, which meant it held *all* of the files in *all* of the scanned tree in memory at one time. It is literally true that the difference between glob and iglob is that with iglob your program doesn't have to store the full list of matches from all subdirectories, but talking about your program is not something we typically do in python docs, it is implied. Perhaps in 2.7/3.4 we can mention in the module docs that at most one directory's worth of data will be held in memory during the globbing process, but it feels a little weird to document an implementation detail like that. Still, if someone can come up with improved wording for the docs, we can add it. -- nosy: +r.david.murray ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22167 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22170] Typo in iterator doc
R. David Murray added the comment: The comma means print doesn't add a newline to what is printed. This is correct because the lines read from the file already have a newline at the end. I can see how this example becomes a little confusing in a tutorial section on iterators, but as Mark said, if you try it, you find out that it works, and if you play with removing the comma you learn things about how python works with files (I don't remember how much of that is covered earlier in the tutorial). In python3 this is clearer, because the equivalent line uses end='', making it clearer that it is intentional and meaningful. Except...that in the python3 tutorial it currently *doesn't* use end='', so that example is in fact wrong and needs to be fixed :) -- nosy: +r.david.murray stage: - needs patch type: enhancement - behavior versions: +Python 3.4, Python 3.5 -Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22170 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22173] Update lib2to3.tests and test_lib2to3 to use test discovery
New submission from Zachary Ware: The attached patch updates lib2to3.tests and the test.test_lib2to3 script to use test discovery. It also re-enables lib2to3.tests.test_all_fixers with a cpu resource guard. That test has been failing since at least 3.2, but was never run anyway. To allow it to pass, the patch adds from __future__ import print_function to lib2to3.main and lib2to3.tests.pytree_idempotency. -- components: 2to3 (2.x to 3.x conversion tool), Tests files: test_lib2to3_discovery.diff keywords: patch messages: 225072 nosy: zach.ware priority: normal severity: normal stage: patch review status: open title: Update lib2to3.tests and test_lib2to3 to use test discovery type: behavior versions: Python 3.4, Python 3.5 Added file: http://bugs.python.org/file36310/test_lib2to3_discovery.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22173 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22173] Update lib2to3.tests and test_lib2to3 to use test discovery
Changes by Zachary Ware zachary.w...@gmail.com: Added file: http://bugs.python.org/file36311/test_lib2to3_discovery.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22173 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22173] Update lib2to3.tests and test_lib2to3 to use test discovery
Changes by Zachary Ware zachary.w...@gmail.com: Removed file: http://bugs.python.org/file36310/test_lib2to3_discovery.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22173 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22170] Typo in iterator doc
Roundup Robot added the comment: New changeset 35db84720d8d by Ezio Melotti in branch '3.4': #22170: avoid printing newlines twice in tutorial example. http://hg.python.org/cpython/rev/35db84720d8d New changeset 79e469ae13b7 by Ezio Melotti in branch 'default': #22170: merge with 3.4. http://hg.python.org/cpython/rev/79e469ae13b7 -- nosy: +python-dev ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22170 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22170] Typo in iterator doc
Ezio Melotti added the comment: Fixed, thanks for the report! -- assignee: docs@python - ezio.melotti nosy: +ezio.melotti resolution: - fixed stage: needs patch - resolved status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22170 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Zachary Ware added the comment: In pre-commit testing, I realized I was getting skips that I shouldn't have been getting, and it turns out that I screwed up both setUpModule functions from the previous patch. New patch fixes test_loading and test_find to use the skipTest method instead of skip decorators, so the necessary variables are actually set when they're looked for. I also combined the setUpModule in test_find with the setUp method of the TestOpenGL_libs into a setUpClass classmethod, which makes things a little simpler and cleaner. Since I was in there anyway, I went ahead and fixed your point about test.support.verbose. I had not thought about that issue previously. I'll go ahead and commit later today unless something else jumps out as being wrong. -- Added file: http://bugs.python.org/file36312/issue22060.v2.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Changes by Zachary Ware zachary.w...@gmail.com: -- versions: +Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Changes by Zachary Ware zachary.w...@gmail.com: Added file: http://bugs.python.org/file36313/issue22060.v2.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Changes by Zachary Ware zachary.w...@gmail.com: Removed file: http://bugs.python.org/file36312/issue22060.v2.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Changes by Zachary Ware zachary.w...@gmail.com: Removed file: http://bugs.python.org/file36313/issue22060.v2.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Zachary Ware added the comment: Maybe this one is actually right... -- Added file: http://bugs.python.org/file36314/issue22060.v2.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22148] frozen.c should #include importlib.h instead of importlib.h
Brett Cannon added the comment: Unfortunately switching to angle brackets breaks on other platforms, e.g. OS X using Clang: Python/frozen.c:5:10: error: 'importlib.h' file not found with angled include; use quotes instead #include importlib.h ^ importlib.h 1 error generated. make: *** [Python/frozen.o] Error 1 Is there a change you want to propose in our configure or Makefile instead? -- status: open - pending ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22148 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19500] Error when connecting to FTPS servers not supporting SSL session resuming
Mark Ribau added the comment: Adding Python v2.7 as also exhibiting this behavior. Some people over on Stack Overflow have done some things to work around the issue via subclassing, but I'm not sure their solutions are correct, so much as have useful side effects. (For example, when only the server has a key/cert and the client does not, how is that handled for reuse?) http://stackoverflow.com/questions/12164470/python-ftp-tls-connection-issue -- nosy: +Mark.Ribau versions: +Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19500 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14534] Add method to mark unittest.TestCases as do not run.
Changes by Wei Wu we...@cacheme.net: Added file: http://bugs.python.org/file36315/01438f18ee18.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14534 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10572] Move test sub-packages to Lib/test
Zachary Ware added the comment: Here's an updated patch to move the sqlite3 tests. It's a large patch because it simplifies things by renaming all of the test methods from Checkxxx to testxxx. The test files are also renamed to fit the usual pattern. -- Added file: http://bugs.python.org/file36316/issue10572-sqlite3.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10572 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Serhiy Storchaka added the comment: Please commit. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22060] Clean up ctypes.test, use unittest test discovery
Roundup Robot added the comment: New changeset fc99cf3615bb by Zachary Ware in branch '3.4': Issue #22060: Clean up/simplify test_ctypes, use test discovery http://hg.python.org/cpython/rev/fc99cf3615bb New changeset 748fb6d622e8 by Zachary Ware in branch 'default': Closes #22060: Merge with 3.4 http://hg.python.org/cpython/rev/748fb6d622e8 -- nosy: +python-dev resolution: - fixed stage: patch review - resolved status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue22060 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
