DreamPie - The Python shell you've always dreamed about!
I'm pleased to announce DreamPie 1.0 - a new graphical interactive Python shell! Some highlights: * Has whatever you would expect from a graphical Python shell - attribute completion, tooltips which show how to call functions, highlighting of matching parentheses, etc. * Fixes a lot of IDLE nuisances - in DreamPie interrupt always works, history recall and completion works as expected, etc. * Results are saved in the Result History. * Long output is automatically folded so you can focus on what's important. * Jython and IronPython support makes DreamPie a great tool for exploring Java and .NET classes. * You can copy any amount of code and immediately execute it, and you can also copy code you typed interactively into a new file, with the Copy Code Only command. No tabs are used! * Free software licensed under GPL version 3. Check it out at http://dreampie.sourceforge.net/ and tell me what you think! Have fun, Noam -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: Pure virtual functions in Python?
On Feb 20, 6:08 pm, Martin v. Loewis mar...@v.loewis.de wrote: class C1: # Pure virtual def cb(self, param1, param2): This is a callback �...@param param1: ... �...@param param2: ... raise NotImplementedError, Implement me # Dispatcher function that calls 'cb' only if 'cb' is implemented in child classes def dispatcher(c): if hasattr(c, 'cb'): c.cb(Hello, World) dispatcher(C2()) dispatcher(C3()) What I want is the ability to have the dispatcher() not to call 'cb' if it was not implemented in one of the child classes. Please advise. There is nothing more beyond that what you already did. You can raise a NotImplementedError for classes that don't implement the method. That's it. That's not true. Currently, the hasattr() call would report that cb is available, when it is actually not implemented. It would be possible to do something like if hasattr(c, 'cb') and not is_pure(c.cb): c.cb(Hello, World) is_pure could, for example, look at a function attribute of the callback. You'd write something like @pure_virtual def cb(self, param1, param2): not_implemented Regards, Martin Hello Martine, Can you elaborate more on how to use the mechanism you described? Thanks, Elias -- http://mail.python.org/mailman/listinfo/python-list
Re: Pure virtual functions in Python?
Thanks everyone for the answers. The dispatcher() is actually sits in C++ code. So my code receives an object that is an instance of the base class, it PyObject_GetAttrString(py_obj, 'funcname'). If the attribute exists I will call PyObject_CallMethod on it. If the base defines the method and it was empty, then my C++ code would still call the function. This is not optimal because I don't want to go from C++ to Python if the _derived_ class does not implement the cb. Now the base class should define it so that doc parsers properly describe the base class. The recipe suggested is not worth the trouble. Unfortunately I cannot use abc module since I use Python 2.5 -- http://mail.python.org/mailman/listinfo/python-list
Re: datelib pythonification
On Feb 21, 12:37 pm, alex goretoy agore...@gmail.com wrote: hello all, since I posted this last time, I've added a new function dates_diff and [SNIP] I'm rather unsure of the context of this posting ... I'm assuming that the subject datelib pythonification refers to trying to make datelib more pythonic, with which you appear to need help. Looking just at the new function (looks like a method to me) dates_diff, problems include: 1. Mostly ignores PEP-8 about spaces after commas, around operators 2. Checks types 3. Checks types using type(x) == type(y) 4. Inconsistent type checking: checks types in case of dates_diff(date1, date2) but not in case of dates_diff([date1, date2]) 5. Doesn't check for 3 or more args. 6. The 0-arg case is for what purpose? 7. The one-arg case is overkill -- if the caller has the two values in alist, all you are saving them from is the * in dates_diff(*alist) 8. Calling type(date.today()) once per 2-arg call would be a gross extravagance; calling it twice per 2-arg call is mind-boggling. 9. start,end=(targs[0][0],targs[0][1]) ... multiple constant subscripts is a code smell; this one is pongier than usual because it could easily be replaced by start, end = targs[0] Untested fix of problems 1, 3, 4, 5, 8, 9: DATE_TYPE = type(date.today()) def dates_diff(self, *targs): nargs = len(targs) if nargs == 0: return self.enddate - self.startdate if nargs == 1: arg = targs[0] if not isinstance(arg, (list, tuple)) or len(arg) != 2: raise Exception( single arg must be list or tuple of length 2) start, end = arg elif nargs == 2: start, end = targs else: raise Exception(expected 0,1, or 2 args; found %d % nargs) if isinstance(start, DATE_TYPE) and isinstance(end, DATE_TYPE): return end - start raise Exception(both values must be of type DATE_TYPE) HTH, John -- http://mail.python.org/mailman/listinfo/python-list
Re: Pure virtual functions in Python?
That's not true. Currently, the hasattr() call would report that cb is available, when it is actually not implemented. It would be possible to do something like if hasattr(c, 'cb') and not is_pure(c.cb): c.cb(Hello, World) is_pure could, for example, look at a function attribute of the callback. You'd write something like @pure_virtual def cb(self, param1, param2): not_implemented Regards, Martin Hello Martine, Can you elaborate more on how to use the mechanism you described? There are various ways to do it; the one I had in mind uses function attributes: def pure_virtual(func): func.pure_virtual = True # only presence of attribute matters, # not value return func def is_pure(method): # method might be either a method or a function try: func = method.im_func except AttributeError: func = method return hasattr(func, 'pure_virtual') not_implemented = object() # could also write pass instead, or raise HTH, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: /usr/bin/ld: cannot find -lz on Cent OS - Python 2.4
V8 NUT olaye1...@googlemail.com writes: /usr/bin/ld: cannot find -lz collect2: ld returned 1 exit status error: command 'gcc' failed with exit status 1 Could it be you're missing zlib-devel? What does yum info zlib-devel say? Or locate libz? -- http://mail.python.org/mailman/listinfo/python-list
DreamPie - The Python shell you've always dreamed about!
I'm pleased to announce DreamPie 1.0 - a new graphical interactive Python shell! Some highlights: * Has whatever you would expect from a graphical Python shell - attribute completion, tooltips which show how to call functions, highlighting of matching parentheses, etc. * Fixes a lot of IDLE nuisances - in DreamPie interrupt always works, history recall and completion works as expected, etc. * Results are saved in the Result History. * Long output is automatically folded so you can focus on what's important. * Jython and IronPython support makes DreamPie a great tool for exploring Java and .NET classes. * You can copy any amount of code and immediately execute it, and you can also copy code you typed interactively into a new file, with the Copy Code Only command. No tabs are used! * Free software licensed under GPL version 3. Check it out at http://dreampie.sourceforge.net/ and tell me what you think! Have fun, Noam -- http://mail.python.org/mailman/listinfo/python-list
Re: Pure virtual functions in Python?
On 02/21/10 19:27, lallous wrote: snip If the base defines the method and it was empty, then my C++ code would still call the function. This is not optimal because I don't want to go from C++ to Python if the _derived_ class does not implement the cb. That sounds like a microoptimization; have you profiled your code and determined that calling empty function causes a bottleneck? I doubt it. Now the base class should define it so that doc parsers properly describe the base class. The recipe suggested is not worth the trouble. Unfortunately I cannot use abc module since I use Python 2.5 Because nobody here could have guessed that your dispatcher was written in C++; your problem is near trivial if your dispatcher is a pure-python code. -- http://mail.python.org/mailman/listinfo/python-list
Re: lists of variables
On 02/21/10 15:21, Steven D'Aprano wrote: So it looks like variables in a list are stored as object references. Python doesn't store variables in lists, it stores objects, always. Even Python variables aren't variables *grin*, although it's really difficult to avoid using the term. Python variables are mappings between names (strings) and objects, not memory locations. Actually, no programming languages have used the term variable correctly, as per its original mathematical definition. -- http://mail.python.org/mailman/listinfo/python-list
Re: lists of variables
On Sat, 20 Feb 2010 23:44:29 -0800, Carl Banks wrote: On Feb 20, 10:50 pm, Steven D'Aprano st...@remove-this- cybersource.com.au wrote: What makes you say that? [...] I don't even understand this. [...] I'm just confused why you think that lexical scoping is equivalent to references that can't be put in lists, or why you think this behaviour is any different from lexical scoping everywhere else? http://tinyurl.com/8e7tm Ha ha ha, very amusing. But I was genuinely confused, because I know you're an experienced Python coder and not some n00b, so I thought maybe you were referring to something that escaped me. Your response, apt though it may be, does nothing to clear up my confusion. Presumably if you had a serious response you would have made it, so I'll chalk it up to a generalised confusion field. *wink* -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
I tried to edit the awfully colors, here are the results:
Traceback (most recent call last):
File dreampie.py, line 4, module()
File dreampielib\gui\__init__.pyc, line 972, main()
File dreampielib\gui\__init__.pyc, line 153,
__init__(self=DreamPie(path...window_main),
pyexec='C:\\Python26\\python.exe')
File dreampielib\gui\__init__.pyc, line 829,
configure(self=DreamPie(path...window_main))
File dreampielib\gui\tags.pyc, line 224,
apply_theme_text(textview=gtk.Tex...xd82038),
textbuffer=gtk.Tex...xd816d0), theme={('bracket-match', 'bg', 'color'):
'darkblue', ('bracket-match', 'bg', 'isset'): True, ('bracket-match', 'fg',
'color'): 'white', ('bracket-match', 'fg', 'isset'): False, ...})
ValueError: unable to parse colour specification
Now the program don't run.
Aage
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Re: DreamPie - The Python shell you've always dreamed about!
I reinstalled and got this message:
Traceback (most recent call last):
File dreampie.py, line 4, module()
File dreampielib\gui\__init__.pyc, line 972, main()
File dreampielib\gui\__init__.pyc, line 153,
__init__(self=DreamPie(path...window_main),
pyexec='C:\\Python26\\python.exe')
File dreampielib\gui\__init__.pyc, line 829,
configure(self=DreamPie(path...window_main))
File dreampielib\gui\tags.pyc, line 224,
apply_theme_text(textview=gtk.Tex...xd82038),
textbuffer=gtk.Tex...xd816d0), theme={('bracket-match', 'bg', 'color'):
'darkblue', ('bracket-match', 'bg', 'isset'): True, ('bracket-match', 'fg',
'color'): 'white', ('bracket-match', 'fg', 'isset'): False, ...})
ValueError: unable to parse colour specification
Aage
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Re: DreamPie - The Python shell you've always dreamed about!
Delete \Documents and Settings\username\DreamPie and it should now
work.
Did you edit the colors using the configuration window or manually?
If you edited them using the configuration window, can you give
instructions on how to reproduce the bug?
Noam
On Feb 21, 3:06 pm, Aage Andersen aaan(REMOVE)@email.dk wrote:
I reinstalled and got this message:
Traceback (most recent call last):
File dreampie.py, line 4, module()
File dreampielib\gui\__init__.pyc, line 972, main()
File dreampielib\gui\__init__.pyc, line 153,
__init__(self=DreamPie(path...window_main),
pyexec='C:\\Python26\\python.exe')
File dreampielib\gui\__init__.pyc, line 829,
configure(self=DreamPie(path...window_main))
File dreampielib\gui\tags.pyc, line 224,
apply_theme_text(textview=gtk.Tex...xd82038),
textbuffer=gtk.Tex...xd816d0), theme={('bracket-match', 'bg', 'color'):
'darkblue', ('bracket-match', 'bg', 'isset'): True, ('bracket-match', 'fg',
'color'): 'white', ('bracket-match', 'fg', 'isset'): False, ...})
ValueError: unable to parse colour specification
Aage
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Re: Which mock library do you prefer?
On Feb 18, 3:20 am, Ben Finney ben+pyt...@benfinney.id.au wrote:
Lacrima lacrima.ma...@gmail.com writes:
Right, isolation [of test cases] is essential. But I can't decide to
which extent I should propagate isolation.
You used “propagate” in a sense I don't understand there.
For example, in Python Testing: Beginner's Guide by Daniel Arbuckle,
author suggests that if you do unittesting you should isolate the
smallest units of code from each other.
I'm not sure what the author means, but I would say that as it stands
that advice is independent of what testing is being done. In all cases:
* Make your code units small, so each one is not doing much and is easy
to understand.
* Make the interface of units at each level as narrow as feasible, so
they're not brittle in the face of changes to the implementation.
For example, if you have a
class:
Class SomeClass(object):
def method1(self):
return 5
def method2(self):
return self.method1 + 10
According to the book, if you want to test method2, you should isolate
it from method1 and class instance('self').
I don't really know what that means.
Remember that each test case should not be “test method1”. That is far
too broad, and in some cases too narrow. There is no one-to-one mapping
between methods and unit test cases.
Instead, each test case should test one true-or-false assertion about
the behaviour of the code. “When we start with this initial state (the
test fixture), and perform this operation, the resulting state is that”.
It makes a lot of sense to name the test case so the assertion being
made *is* its name: not ‘test frobnicate’ with dozens of assertions, but
one ‘test_frobnicate_with_valid_spangulator_returns_true’ which makes
that assertion, and extra ones for each distinct assertion.
The failure of a unit test case should indicate *exactly* what has gone
wrong. If you want to make multiple assertions about a code unit, write
multiple test cases for that unit and name the tests accordingly.
This incidentally requires that you test something small enough that
such a true-or-false assertion is meaningful, which leads to
well-designed code with small easily-tested code units. But that's an
emergent property, not a natural law.
Currently, I don't create mocks of units if they are within the same
class with the unit under test. If that is not right approach, please,
explain what are best practices... I am just learning TDD..
In the fixture of the unit test case, create whatever test doubles are
necessary to put your code into the initial state you need for the test
case; then tear all those down whatever the result of the test case.
If you need to create great honking wads of fixtures for any test case,
that is a code smell: your code units are too tightly coupled to
persistent state, and need to be decoupled with narrow interfaces.
The Python ‘unittest’ module makes this easier by letting you define
fixtures common to many test cases (the ‘setUp’ and ‘tearDown’
interface). My rule of thumb is: if I need to make different fixtures
for some set of test cases, I write a new test case class for those
cases.
--
\ “Following fashion and the status quo is easy. Thinking about |
`\ your users' lives and creating something practical is much |
_o__) harder.” —Ryan Singer, 2008-07-09 |
Ben Finney
Hi, Ben!!!
Sorry for too late reply!!!
Thank you very much for sharing your experience! I still have to grasp
a lot in TDD.
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Re: DreamPie - The Python shell you've always dreamed about!
On Feb 21, 3:42�am, Noam Yorav-Raphael noamr...@gmail.com wrote: I'm pleased to announce DreamPie 1.0 - a new graphical interactive Python shell! What versions of Python does it suuport? -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
On Feb 21, 10:30�am, Mensanator mensana...@aol.com wrote: On Feb 21, 3:42 am, Noam Yorav-Raphael noamr...@gmail.com wrote: I'm pleased to announce DreamPie 1.0 - a new graphical interactive Python shell! What versions of Python does it suuport? What OS are supported? -- http://mail.python.org/mailman/listinfo/python-list
Free chat for u.....hot.hot.....hot..............
http://chattingfree.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
http://dreampie.sourceforge.net/download.html reading is a wonderful thing. On Sun, Feb 21, 2010 at 11:32 AM, Mensanator mensana...@aol.com wrote: On Feb 21, 10:30�am, Mensanator mensana...@aol.com wrote: On Feb 21, 3:42 am, Noam Yorav-Raphael noamr...@gmail.com wrote: I'm pleased to announce DreamPie 1.0 - a new graphical interactive Python shell! What versions of Python does it suuport? What OS are supported? -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
This is bloody fantastic! I must say, this fixes everything I hate about Ipython and gives me the feature I wished it had (with a few minor exceptions). I confirm this working on Kubuntu 9.10 using the ppa listed on the sites download page. I also confirm that it works interactively with PyQt4 and PyGtk (as to be expected since these toolkits use the PyOS_inputhook for the mainloop). However, it does not work interactively with wx (again, this is as expected since wx doesn't use the PyOS_inputhook). In short, the gui toolkit support is the same as in Ipython if you dont use any of the magic threading switches, which are now deprecated anyway. Matplotlib does not work interactively for me. Is there a special switch that needs to be used? or should a pick a non-wx backend? (i'm thinking the latter is more likely) A couple of things I would like to see (and will help implement if I can find the time): 1) A shortcut to show the docstring of an object. Something like Ipython's `?`. i.e. `object.foo?` translates to `help(object.foo)` 2) How do I change the color of the blinking cursor at the bottom? I can't see the damn thing! 3) line numbers instead of the `` prompt 4) a plugin facility where we can define our own `magic` commands. I use Ipython's %timeit ALL the time. 5) Double-click to re-fold the output section as well. Thanks for making this Cheers, Chris On Sun, Feb 21, 2010 at 4:42 AM, Noam Yorav-Raphael noamr...@gmail.comwrote: I'm pleased to announce DreamPie 1.0 - a new graphical interactive Python shell! Some highlights: * Has whatever you would expect from a graphical Python shell - attribute completion, tooltips which show how to call functions, highlighting of matching parentheses, etc. * Fixes a lot of IDLE nuisances - in DreamPie interrupt always works, history recall and completion works as expected, etc. * Results are saved in the Result History. * Long output is automatically folded so you can focus on what's important. * Jython and IronPython support makes DreamPie a great tool for exploring Java and .NET classes. * You can copy any amount of code and immediately execute it, and you can also copy code you typed interactively into a new file, with the Copy Code Only command. No tabs are used! * Free software licensed under GPL version 3. Check it out at http://dreampie.sourceforge.net/ and tell me what you think! Have fun, Noam -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Saving the Interactive Window with PythonWin
Hi everyone, When I run a python script, I know that I can print the results of my calculations on the Interactive Window. Once the scripts ends, I can copy/pate these results on an OpenOffice Writer document. However, I would like to know if I can somehow add some lines to my script, so that it saves the Interactive Window to a text file. How could it be done? And, is there a way to programatically clear out the Interactive Window so that it only shows the last run? Thank you for your help -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
I tested it in Windows Vista. When I type single or double quotes, I get a unicode character, different of python's quotes, and it break my code. But i liked this tool! Thanks! []s iuri On Sun, Feb 21, 2010 at 3:13 PM, Chris Colbert sccolb...@gmail.com wrote: This is bloody fantastic! I must say, this fixes everything I hate about Ipython and gives me the feature I wished it had (with a few minor exceptions). I confirm this working on Kubuntu 9.10 using the ppa listed on the sites download page. I also confirm that it works interactively with PyQt4 and PyGtk (as to be expected since these toolkits use the PyOS_inputhook for the mainloop). However, it does not work interactively with wx (again, this is as expected since wx doesn't use the PyOS_inputhook). In short, the gui toolkit support is the same as in Ipython if you dont use any of the magic threading switches, which are now deprecated anyway. Matplotlib does not work interactively for me. Is there a special switch that needs to be used? or should a pick a non-wx backend? (i'm thinking the latter is more likely) A couple of things I would like to see (and will help implement if I can find the time): 1) A shortcut to show the docstring of an object. Something like Ipython's `?`. i.e. `object.foo?` translates to `help(object.foo)` 2) How do I change the color of the blinking cursor at the bottom? I can't see the damn thing! 3) line numbers instead of the `` prompt 4) a plugin facility where we can define our own `magic` commands. I use Ipython's %timeit ALL the time. 5) Double-click to re-fold the output section as well. Thanks for making this Cheers, Chris On Sun, Feb 21, 2010 at 4:42 AM, Noam Yorav-Raphael noamr...@gmail.comwrote: I'm pleased to announce DreamPie 1.0 - a new graphical interactive Python shell! Some highlights: * Has whatever you would expect from a graphical Python shell - attribute completion, tooltips which show how to call functions, highlighting of matching parentheses, etc. * Fixes a lot of IDLE nuisances - in DreamPie interrupt always works, history recall and completion works as expected, etc. * Results are saved in the Result History. * Long output is automatically folded so you can focus on what's important. * Jython and IronPython support makes DreamPie a great tool for exploring Java and .NET classes. * You can copy any amount of code and immediately execute it, and you can also copy code you typed interactively into a new file, with the Copy Code Only command. No tabs are used! * Free software licensed under GPL version 3. Check it out at http://dreampie.sourceforge.net/ and tell me what you think! Have fun, Noam -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Not sure why this is filling my sys memory
@sstein...@gmail.com sstein...@gmail.com See this article for some more info about the reported sizes of things: http://www.doughellmann.com/PyMOTW/sys/limits.html; I posted this question on stack overflow. I now have a better appreciation of ssteinerX suggestions of the above link and guppy, I also had pympler suggested. http://stackoverflow.com/questions/2306523/reading-text-files-into-list-then-storing-in-dictionay-fills-system-memory-a Thanks again *Vincent Davis 720-301-3003 * vinc...@vincentdavis.net my blog http://vincentdavis.net | LinkedInhttp://www.linkedin.com/in/vincentdavis On Sat, Feb 20, 2010 at 7:15 PM, sstein...@gmail.com sstein...@gmail.comwrote: On Feb 20, 2010, at 8:05 PM, Vincent Davis wrote: Code is below, The files are about 5mb and 230,000 rows. When I have 43 files of them and when I get to the 35th (reading it in) my system gets so slow that it is nearly functionless. I am on a mac and activity monitor shows that python is using 2.99GB of memory (of 4GB). (python 2.6 64bit). The getsizeof() returns 6424 bytes for the alldata . So I am not sure what is happening. See this article for some more info about the reported sizes of things: http://www.doughellmann.com/PyMOTW/sys/limits.html S -- http://mail.python.org/mailman/listinfo/python-list
formatting a number as percentage
I'm trying to print .7 as 70%
I've tried:
print format(.7,'%%')
.7.format('%%')
but neither works. I don't know what the syntax is...
Can you help?
Thank you
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Re: DreamPie - The Python shell you've always dreamed about!
On Feb 21, 2010, at 11:51 AM, Chris Colbert wrote: http://dreampie.sourceforge.net/download.html reading is a wonderful thing. I got it running on OS X with MacPorts after about an hour of installing everything required for gtk and gtksourceview (including a new gcc, apparently). Now...if I can just figure out how to set the font to something I can actually read both size and anti-alias-wise. S On Sun, Feb 21, 2010 at 11:32 AM, Mensanator mensana...@aol.com wrote: On Feb 21, 10:30�am, Mensanator mensana...@aol.com wrote: On Feb 21, 3:42 am, Noam Yorav-Raphael noamr...@gmail.com wrote: I'm pleased to announce DreamPie 1.0 - a new graphical interactive Python shell! What versions of Python does it suuport? What OS are supported? -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: formatting a number as percentage
print('%.0f%%' % (0.7*100))
70%
On Sun, Feb 21, 2010 at 12:53 PM, vsoler vicente.so...@gmail.com wrote:
I'm trying to print .7 as 70%
I've tried:
print format(.7,'%%')
.7.format('%%')
but neither works. I don't know what the syntax is...
Can you help?
Thank you
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Re: formatting a number as percentage
On 2010-02-21 09:53:45 -0800, vsoler vicente.so...@gmail.com said:
I'm trying to print .7 as 70%
I've tried:
print format(.7,'%%')
.7.format('%%')
but neither works. I don't know what the syntax is...
print Grade is {0:%}.format(.87)
Grade is 87.00%
or if you want to suppress those trailing zeroes:
print Grade is {0:.0%}.format(.87)
Grade is 87%
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Re: DreamPie - The Python shell you've always dreamed about!
On 21 Feb, 17:32, Mensanator mensana...@aol.com wrote: On Feb 21, 10:30 am, Mensanator mensana...@aol.com wrote: What versions of Python does it suuport? What OS are supported? From the Web site referenced in the announcement (http:// dreampie.sourceforge.net/): # Supports Python 2.5, Python 2.6, Jython 2.5, IronPython 2.6 and Python 3.1. # Works on Windows and Linux. Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: formatting a number as percentage
On Feb 21, 5:53 pm, vsoler vicente.so...@gmail.com wrote:
I'm trying to print .7 as 70%
I've tried:
print format(.7,'%%')
.7.format('%%')
but neither works. I don't know what the syntax is...
Assuming that you're using Python 2.6 (or Python 3.x):
format(.7, '%')
'70.00%'
format(.7, '.2%')
'70.00%'
Or see TomF's response for how to use this with the str.format method.
--
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--
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Re: formatting a number as percentage
On Feb 21, 7:11 pm, TomF tomf.sess...@gmail.com wrote:
On 2010-02-21 09:53:45 -0800, vsoler vicente.so...@gmail.com said:
I'm trying to print .7 as 70%
I've tried:
print format(.7,'%%')
.7.format('%%')
but neither works. I don't know what the syntax is...
print Grade is {0:%}.format(.87)
Grade is 87.00%
or if you want to suppress those trailing zeroes:
print Grade is {0:.0%}.format(.87)
Grade is 87%
Excellent, works perfect!!!
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Re: Interesting talk on Python vs. Ruby and how he would like Python to have just a bit more syntactic flexibility.
Jonathan Gardner jgard...@jonathangardner.net writes: On Fri, Feb 19, 2010 at 11:16 PM, Lie Ryan lie.1...@gmail.com wrote: Now, why don't we start a PEP to make python a fully-functional language then? Because people don't think the same way that programs are written in functional languages. Heh! When I learned Miranda it felt natural to me. Prolog on the other hand... In short: I am afraid you're overgeneralizing here; it depends on one's background. If not, citation needed ;-) -- John Bokma j3b Hacking Hiking in Mexico - http://johnbokma.com/ http://castleamber.com/ - Perl Python Development -- http://mail.python.org/mailman/listinfo/python-list
Re: The future of frozen types as the number of CPU cores increases
On 21 Feb, 03:00, sjdevn...@yahoo.com sjdevn...@yahoo.com wrote: On Feb 18, 2:58 pm, John Nagle na...@animats.com wrote: Multiple processes are not the answer. That means loading multiple copies of the same code into different areas of memory. The cache miss rate goes up accordingly. A decent OS will use copy-on-write with forked processes, which should carry through to the cache for the code. True, but the principal issue with CPython and copy-on-write is the reference counting. Consider a large list shared with the child processes which is to be processed (either in part or in its entirety) by each of them. As soon as the child processes start referencing each of the elements, the reference count for each element object will need to be changed and pages will start to be copied for each child process. That's why John wants to avoid the reference counting of shared data and why the Unladen Swallow project has apparently considered storing reference counts in separate regions of memory. Such shared data is really owned by the parent process, so it makes little sense for the child processes to manage it with a view to collecting it later. After all, such data should have no cost to each of the child processes (except, perhaps, for the size of the address space referenced by each process, and any resource issues arising from managing that). Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: formatting a number as percentage
vsoler vicente.so...@gmail.com wrote:
I'm trying to print .7 as 70%
I've tried:
print format(.7,'%%')
.7.format('%%')
but neither works. I don't know what the syntax is...
Did you try this:
print('%d%%' % (0.7 * 100))
70%
Best regards,
Günther
--
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Re: Efficient way to break up a list into two pieces
On 21 Feb., 04:40, Steven D'Aprano st...@remove-this- cybersource.com.au wrote: Additionally, Python lists are over-allocated so that appends are fast. A list of (say) 1000 items might be over-allocated to (say) 1024 items, so that you can do 24 appends before the array is full and the array needs to be resized. This means that, on average, Python list appending is O(1) instead of O(N). You can't just change the length blindly, you need to worry about the over-allocation. Ok, I see your point. However, other data representation might still be able to optimize such a multi-element pop. I'm thinking of deques, for example. I'm sympathetic to your concern: I've often felt offended that doing something like this: x = SomeReallyBigListOrString for item in x[1:]: process(item) has to copy the entire list or string (less the first item). But honestly, I've never found a situation where it actually mattered. Good grief, it copies that, too? I assumed that the copying is at least delayed until the assignment and that x[1:] is represented by some wrapper that just shuffles the indices around (much like the .indices method that MRAB suggested). Maybe copying chunks of data really isn't that much of an issue as it used to be (and maybe I'm getting old). The application I have in mind has to do with symbolic computation, and expressions would be represented by python lists. It's too early to do any profiling (in fact, it's at the deciding if python is the right language to implement it stage), but it will have to handle expressions with many terms (i.e. long lists), and in the end taking these lists apart and putting them back together in different order is the only thing the code will do. That to explain my interest in performance issues related to pyhton lists. Anyway, thanks for your help. Martin. -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficient way to break up a list into two pieces
On 21 Feb., 07:38, Carl Banks pavlovevide...@gmail.com wrote: Numpy arrays can share underlying data like that when you take slices. For instance, this probably works the way you want: a = numpy.array([1,2,3,4,5,6]) b = a[:3] c = a[3:] None of the actual data was copied here. Hmm, that might be worth looking into. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficient way to break up a list into two pieces
MRAB wrote: Steven D'Aprano wrote: [snip] I'm sympathetic to your concern: I've often felt offended that doing something like this: x = SomeReallyBigListOrString for item in x[1:]: process(item) has to copy the entire list or string (less the first item). But honestly, I've never found a situation where it actually mattered. [snip] Could lists gain an .items() method with start and end positions? I was thinking that it would be a 'view', like with dicts in Python 3. Of course, that would only be worthwhile with very long lists: x = SomeReallyBigListOrString for item in x.items(1): process(item) Actually, my example is a bit wrong! My suggestion should have said that the arguments of list.items would resemble those of range: x = SomeReallyBigListOrString for item in x.items(1, None): # [1 : None], or just [1 : ] process(item) Having a third 'stride' argument would also be possible. -- http://mail.python.org/mailman/listinfo/python-list
FOREX : Foreign Exchange Market : FX : Currency Market : Earn Money Quickly.
FOREX : Foreign Exchange Market : FX : Currency Market : Earn Money Quickly. Simple Optimized Tips and Tricks, Basics of FOREX to be a king of FOREX in one day. Check out these exclusive never seen tips for free at http://forex-fx-currencymarket.blogspot.com/2010/02/forex-market-size-and-liquidity-showing.html Contents Overview : FOREX : Market Size and Liquidity Showing Top 10 Currency Traders FOREX : Speculation of Currency FOREX : Instruments Financially including Transactions FOREX : FX Rates Determinants as per Government FOREX : Trading Characteristics and Trading Centers FOREX : Market Participants with Access Levels -- http://mail.python.org/mailman/listinfo/python-list
Re: How would I do a continuous write over a pipe in the following code...
On Sun, Feb 21, 2010 at 1:09 PM, Dennis Lee Bieber wlfr...@ix.netcom.com wrote: On Sat, 20 Feb 2010 12:46:24 -0800 (PST), chad cdal...@gmail.com declaimed the following in comp.lang.python: Given the following #!/usr/bin/python import subprocess as s broadcast = s.Popen(echo test | wall, shell=True,stdout=s.PIPE) out = broadcast.stdout while 1: out Does nothing... out is a name bound to the object identified by broadcast.stdout... It does nothing unless it is called as... out(somedata) I'm pretty sure you meant: out.write(somedata) Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Overcoming python performance penalty for multicore CPU
John Nagle wrote: I know there's a performance penalty for running Python on a multicore CPU, but how bad is it? I've read the key paper (www.dabeaz.com/python/GIL.pdf), of course. It would be adequate if the GIL just limited Python to running on one CPU at a time, but it's worse than that; there's excessive overhead due to a lame locking implementation. Running CPU-bound multithreaded code on a dual-core CPU runs HALF AS FAST as on a single-core CPU, according to Beasley. I couldn't reproduce these results on Linux. Not sure what HALF AS FAST is; I suppose it means it runs TWICE AS LONG - this is what I couldn't reproduce. If I run Beazley's program on Linux 2.6.26, on a 4 processor Xeon (3GHz) machine, I get 30s for the sequential execution, 40s for the multi-threaded case, and 32s for the multi-threaded case when pinning the Python process to a single CPU (using taskset(1)). So it's 6% overhead for threading, and 25% penalty for multicore CPUs - far from the 100% you seem to expect. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficient way to break up a list into two pieces
On Feb 20, 5:55 pm, marwie mar...@gmx.de wrote: On 21 Feb., 02:30, Steven D'Aprano st...@remove-this- cybersource.com.au wrote: Python lists are arrays of pointers to objects, so copying a slice is fast: it doesn't have to copy the objects, just pointers. Deleting from the end of the list is also quick, because you don't have to move memory, just clear some pointers and change the length field. Splitting such an array without copying data is, essentially, impossible. Python lists aren't linked lists. Well, to split a C array I would simply set l2 to point to l1[10] and then change the length of l1 (which I store somewhere else). No copying of elements needed. I would have assumed that python can do something like this with its internal arrays of pointers, too. When you remove 10 elements off of a list of size 1000, none of the objects themselves are moved, but the pointers to the objects are all moved, so k*990 bytes get moved backward, where k is the size of a pointer (4 or 8 typically on modern computers). There is no mechanism to advance a pointer forward when you delete or pop from the top. I proposed the following patch to implement an advance-the-pointer scheme, but it is unlikely to be accepted in the near future: http://bugs.python.org/file16034/no_mem_penalty.diff http://bugs.python.org/issue7784 You can find alternative data structures that might serve your needs better, such as collections.deque. If you are interested in how Python lists work internally, you mostly want to look at listobject.c: http://svn.python.org/view/python/trunk/Objects/listobject.c?view=markup In particular, look at list_resize(), list_slice(), and list_ass_slice(). -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
On Feb 21, 12:14 pm, Paul Boddie p...@boddie.org.uk wrote: On 21 Feb, 17:32, Mensanator mensana...@aol.com wrote: On Feb 21, 10:30 am, Mensanator mensana...@aol.com wrote: What versions of Python does it suuport? What OS are supported? From the Web site referenced in the announcement (http:// dreampie.sourceforge.net/): # Supports Python 2.5, Python 2.6, Jython 2.5, IronPython 2.6 and Python 3.1. # Works on Windows and Linux. Yeah, I saw that. Funny that something important like that wasn't part of the announcement. I notice no mention of Mac OS, so visiting the website was a complete waste of time on my part, wasn't it? Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Overcoming python performance penalty for multicore CPU
On Sun, 2010-02-21 at 22:22 +0100, Martin v. Loewis wrote: John Nagle wrote: I know there's a performance penalty for running Python on a multicore CPU, but how bad is it? I've read the key paper (www.dabeaz.com/python/GIL.pdf), of course. It would be adequate if the GIL just limited Python to running on one CPU at a time, but it's worse than that; there's excessive overhead due to a lame locking implementation. Running CPU-bound multithreaded code on a dual-core CPU runs HALF AS FAST as on a single-core CPU, according to Beasley. I couldn't reproduce these results on Linux. Not sure what HALF AS FAST is; I suppose it means it runs TWICE AS LONG - this is what I couldn't reproduce. If I run Beazley's program on Linux 2.6.26, on a 4 processor Xeon (3GHz) machine, I get 30s for the sequential execution, 40s for the multi-threaded case, and 32s for the multi-threaded case when pinning the Python process to a single CPU (using taskset(1)). So it's 6% overhead for threading, and 25% penalty for multicore CPUs - far from the 100% you seem to expect. It's far from scientific, but I've seen behaviour that's close to a 100% performance penalty on a dual-core linux system: http://www.rfk.id.au/blog/entry/a-gil-adventure-threading2 Short story: a particular test suite of mine used to run in around 25 seconds, but a bit of ctypes magic to set thread affinity dropped the running time to under 13 seconds. Cheers, Ryan -- Ryan Kelly http://www.rfk.id.au | This message is digitally signed. Please visit r...@rfk.id.au| http://www.rfk.id.au/ramblings/gpg/ for details signature.asc Description: This is a digitally signed message part -- http://mail.python.org/mailman/listinfo/python-list
Use eval() safely?
Hi,
I know that this issue has been discussed before, but most of
the time using only one argument to eval().
Is it possible to use the following code, e.g. run as part of a
web application, to break in and if so, how?
import math
def myeval(untrustedinput):
return eval(untrustedinput, {__builtins__: None},
{ abs: abs, sin: math.sin })
Is it possible to define functions or import modules from the
untrusted input string?
Which Python built-ins and math functions would I have to add to
the functions dictionary to make it unsafe?
TIA! (Please cc me, thanks.)
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Re: lists of variables
Michael Pardee python-l...@open-sense.com wrote in message
news:mailman.22.1266722722.4577.python-l...@python.org...
I'm relatively new to python and I was very surprised by the following
behavior:
a=1
b=2
mylist=[a,b]
print mylist
[1, 2]
a=3
print mylist
[1, 2]
Whoah! Are python lists only for literals? Nope:
c={}
d={}
mydlist=[c,d]
print mydlist
[{}, {}]
c['x']=1
print mydlist
[{'x': 1}, {}]
So it looks like variables in a list are stored as object references.
This seems to confirm that:
mydlist[1]['y']=4
print mydlist
[{}, {'y': 4}]
So I figure my initial example doesn't work because if you assign a
That shows a different outlook. I would have said your first example works
as expected and it was the second example that was strange, possibly due to
shallow instead of deep copies by Python.
--
Bartc
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Re: DreamPie - The Python shell you've always dreamed about!
On Feb 21, 2010, at 4:40 PM, Mensanator wrote: On Feb 21, 12:14 pm, Paul Boddie p...@boddie.org.uk wrote: On 21 Feb, 17:32, Mensanator mensana...@aol.com wrote: On Feb 21, 10:30 am, Mensanator mensana...@aol.com wrote: What versions of Python does it suuport? What OS are supported? From the Web site referenced in the announcement (http:// dreampie.sourceforge.net/): # Supports Python 2.5, Python 2.6, Jython 2.5, IronPython 2.6 and Python 3.1. # Works on Windows and Linux. Yeah, I saw that. Funny that something important like that wasn't part of the announcement. I notice no mention of Mac OS, so visiting the website was a complete waste of time on my part, wasn't it? See my earlier message -- I have it running just fine on 10.6 with MacPorts and even managed to report a bug! S Paul -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Overcoming python performance penalty for multicore CPU
It's far from scientific, but I've seen behaviour that's close to a 100% performance penalty on a dual-core linux system: http://www.rfk.id.au/blog/entry/a-gil-adventure-threading2 Short story: a particular test suite of mine used to run in around 25 seconds, but a bit of ctypes magic to set thread affinity dropped the running time to under 13 seconds. Indeed, it's not scientific - but with a few more details, you could improve it quite a lot: what specific Linux distribution (the posting doesn't even say it's Linux), what specific Python version had you been using? (less important) what CPUs? If you can: what specific test suite? A lot of science is about repeatability. Making a systematic study is (IMO) over-valued - anecdotal reports are useful, too, as long as they allow for repeatable experiments. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: Overcoming python performance penalty for multicore CPU
On Sun, 2010-02-21 at 23:05 +0100, Martin v. Loewis wrote: It's far from scientific, but I've seen behaviour that's close to a 100% performance penalty on a dual-core linux system: http://www.rfk.id.au/blog/entry/a-gil-adventure-threading2 Short story: a particular test suite of mine used to run in around 25 seconds, but a bit of ctypes magic to set thread affinity dropped the running time to under 13 seconds. Indeed, it's not scientific - but with a few more details, you could improve it quite a lot: what specific Linux distribution (the posting doesn't even say it's Linux), what specific Python version had you been using? (less important) what CPUs? If you can: what specific test suite? I'm on Ubuntu Karmic, Python 2.6.4, an AMD Athlon 7750 dual core. Unfortunately the test suite is for a proprietary application. I've been able to reproduce similar behaviour with an open-source test suite, using the current trunk of the pyfilesystem project: http://code.google.com/p/pyfilesystem/ In this project OSFS is an object-oriented interface to the local filesystem. The test case TestOSFS.test_cases_in_separate_dirs runs three theads, each doing a bunch of IO in a different directory. Running the tests normally: r...@durian:/storage/software/fs$ nosetests fs/tests/test_fs.py:TestOSFS.test_cases_in_separate_dirs . -- Ran 1 test in 9.787s That's the best result from five runs - I saw it go as high as 12 seconds. Watching it in top, I see CPU usage at around 150%. Now using threading2 to set the process cpu affinity at the start of the test run: r...@durian:/storage/software/fs$ nosetests fs/tests/test_fs.py:TestOSFS.test_cases_in_separate_dirs . -- Ran 1 test in 3.792s Again, best of five. The variability in times here is much lower - I never saw it go above 4 seconds. CPU usage is consistently 100%. Cheers, Ryan -- Ryan Kelly http://www.rfk.id.au | This message is digitally signed. Please visit r...@rfk.id.au| http://www.rfk.id.au/ramblings/gpg/ for details signature.asc Description: This is a digitally signed message part -- http://mail.python.org/mailman/listinfo/python-list
Re: with statement and standard library
nobrowser wrote: Hi. The with statement is certainly nifty. The trouble is, the *only* two documented examples how it can be used with the library classes are file objects (which I use all the time) and thread locks which I almost never use. Yet there are many, many classes in the library whose use would be more elegant and readable if the with statement could be employed. Start with the connection objects in httplib and you can probably come up with 10 others easily. with is important for locks because it matters when they're released. It's not as important if release is just resource recovery. Reference counting will recover most objects when they go out of scope anyway. Don't get carried away just because a new feature is available. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: with statement and standard library
On Sun, Feb 21, 2010 at 3:21 PM, John Nagle na...@animats.com wrote: nobrowser wrote: Hi. The with statement is certainly nifty. The trouble is, the *only* two documented examples how it can be used with the library classes are file objects (which I use all the time) and thread locks which I almost never use. Yet there are many, many classes in the library whose use would be more elegant and readable if the with statement could be employed. Start with the connection objects in httplib and you can probably come up with 10 others easily. with is important for locks because it matters when they're released. It's not as important if release is just resource recovery. Reference counting will recover most objects when they go out of scope anyway. If you're using CPython that is. The other implementations don't use refcounting and thus don't guarantee the GC will be that timely. So if one wants maximum portability, the `with` statement is *quite* useful. Not to mention there are other uses for `with` besides just freeing resources; e.g. setting a temporary decimal arithmetic context. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficient way to break up a list into two pieces
On Sun, 21 Feb 2010 11:07:24 -0800, marwie wrote: x = SomeReallyBigListOrString for item in x[1:]: process(item) has to copy the entire list or string (less the first item). But honestly, I've never found a situation where it actually mattered. Good grief, it copies that, too? I assumed that the copying is at least delayed until the assignment and that x[1:] is represented by some wrapper that just shuffles the indices around (much like the .indices method that MRAB suggested). Such complexity doesn't happen for free. It costs developer time, more complexity means more bugs, and more runtime overhead, especially for small lists. 99.9% of programs operate on small amounts of data, and small gets bigger every year. (I was reading one of my old Uni text books the other day, and one of the projects was an application to index all the words in a text file. The author decided to use disk storage rather than in-memory data structures because he was hoping to read files up to 60,000 words, and considered it unlikely that any PCs would have enough memory to store 60,000 words!) Unless you actually profile the code, you're as likely to be *slowing Python down* by such extra sophistication as you are to speed it up. Copying blocks of pointers is really fast on modern CPUs. As a general rule, Python aims for simplicity of implementation rather than clever, but fragile, tricks. Maybe copying chunks of data really isn't that much of an issue as it used to be (and maybe I'm getting old). The application I have in mind has to do with symbolic computation, and expressions would be represented by python lists. It's too early to do any profiling (in fact, it's at the deciding if python is the right language to implement it stage), but it will have to handle expressions with many terms (i.e. long lists), and in the end taking these lists apart and putting them back together in different order is the only thing the code will do. Are you likely to have expressions with a hundred or so MILLION terms? If so, then you should start thinking about clever tricks to minimise copying. Otherwise, you're engaged in premature optimization, which is the root of all computer science evil :) -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: lists of variables
Steven D'Aprano wrote: On Sat, 20 Feb 2010 22:31:44 -0800, Carl Banks wrote: The one place where Python does have references is when accessing variables in an enclosing scope (not counting module-level). What makes you say that? I think Carl is talking about cells, which *are* actually objects (in CPython at least), but they're internal details of the interpreter, and you can't do anything useful with them from Python code. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
On Sun, 21 Feb 2010 13:40:54 -0800, Mensanator wrote: Yeah, I saw that. Funny that something important like that wasn't part of the announcement. I notice no mention of Mac OS, so visiting the website was a complete waste of time on my part, wasn't it? Of course not. Now you know that Mac OS isn't officially supported, so you're less ignorant than you were before you went to the website. But since Dreampie is written in Python, it shouldn't be that hard to have it run on Mac OS, provided you can get the GUI tool kit it requires. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Pure virtual functions in Python?
lallous wrote: If the base defines the method and it was empty, then my C++ code would still call the function. This is not optimal because I don't want to go from C++ to Python if the _derived_ class does not implement the cb. I would simply not implement the method at all in the base class. Then the C++ code can do an attribute lookup for the method, and if it's not found, do nothing. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: Use eval() safely?
On Sun, 21 Feb 2010 22:25:11 +0100, W. Martin Borgert wrote:
Hi,
I know that this issue has been discussed before, but most of the time
using only one argument to eval().
Is it possible to use the following code, e.g. run as part of a web
application, to break in and if so, how?
import math
def myeval(untrustedinput):
return eval(untrustedinput, {__builtins__: None},
{ abs: abs, sin: math.sin })
Is it possible to define functions or import modules from the untrusted
input string?
Which Python built-ins and math functions would I have to add to the
functions dictionary to make it unsafe?
You've got the right idea, but the task is difficult.
Please read this thread:
http://tav.espians.com/a-challenge-to-break-python-security.html
--
Steven
--
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Problem creating executable, with PyQwt
My student is trying to build an executable version of a program that uses PyQt and PyQwt, on Windows XP. She has installed: Python 2.6.1, Qt 4.5.0, PyQt 4.5, and PyQwt 5.2.0. There is a module error on running the executable produced by py2exe. Here is the info I got from my student: quote Traceback (most recent call last): File ABM15.pyw, line 15, in module File PyQt4\Qwt5\__init__.pyc, line 32, in module File PyQt4\Qwt5\Qwt.pyc, line 12, in module File PyQt4\Qwt5\Qwt.pyc, line 10, in __load ImportError: No module named QtSvg If you Google this last line, you'll find that I've posted this to a forum, but no one answered me. Someone has also had this problem before, although I think they were using PyInstaller and not py2exe. They say that its because Qwt has a hidden import for QtSvg. If I can turn this off, maybe it'll work, but I don't know how. I have downloaded py2exe and I run the attached setup.py file in my working directory. It creates two directories: 'dist' and 'build'. An executable is created in the 'dist' directory along with other things. When I tried running it, it produces a log file, in which I find the error messages. \quote Perhaps someone can recognize these symptoms. Thanks, Gib -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a way to continue after an exception ?
On 21-02-2010 03:51, Ryan Kelly wrote:
On Sun, 2010-02-21 at 13:17 +1100, Lie Ryan wrote:
On 02/21/10 12:02, Stef Mientki wrote:
On 21-02-2010 01:21, Lie Ryan wrote:
On Sun, Feb 21, 2010 at 12:52 AM, Stef Mientki
stef.mien...@gmail.com wrote:
hello,
I would like my program to continue on the next line after an uncaught
exception,
is that possible ?
thanks
Stef Mientki
That reminds me of VB's On Error Resume Next
I think that's what I'm after ...
A much better approach is to use callbacks, the callbacks determines
whether to raise an exception or continue execution:
def handler(e):
if datetime.datetime.now()= datetime.datetime(2012, 12, 21):
raise Exception('The world has ended')
# else: ignore, it's fine
def add_ten_error_if_zero(args, handler):
if args == 0:
handler(args)
return args + 10
print add_ten_error_if_zero(0, handler)
print add_ten_error_if_zero(10, handler)
print add_ten_error_if_zero(0, lambda e: None) # always succeeds
Or if you don't like having to explicitly manage callbacks, you can try
the withrestart module:
http://pypi.python.org/pypi/withrestart/
It tries to pinch some of the good ideas from Common Lisp's
error-handling system.
from withrestart import *
def add_ten_error_if_zero(n):
# This gives calling code the option to ignore
# the error, or raise a different one.
with restarts(skip,raise_error):
if n == 0:
raise ValueError
return n + 10
# This will raise ValueError
print add_ten_error_if_zero(0)
# This will print 10
with Handler(ValueError,skip):
print add_ten_error_if_zero(0)
# This will exit the python interpreter
with Handler(ValueError,raise_error,SystemExit):
print add_ten_error_if_zero(0)
Cheers,
Ryan
thanks Ryan (and others),
your description of withstart was very informative,
and I think I understand why it's impossible what I want
(something like madExcept for Delphi / C / C++, see
*http://www.madshi.net/madExceptDescription.htm )
*
It are not the bugs that you can predict / expect to catch,
but the uncaught bugs.
So made some first steps,
and this seems to be sufficient for now,
if you're interested, look here,
http://mientki.ruhosting.nl/data_www/pylab_works/pw_bug_reporter.html
cheers,
Stef
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Re: Problem creating executable, with PyQwt
On Monday 22 February 2010 01:17, Gib Bogle wrote: quote Traceback (most recent call last): File ABM15.pyw, line 15, in module File PyQt4\Qwt5\__init__.pyc, line 32, in module File PyQt4\Qwt5\Qwt.pyc, line 12, in module File PyQt4\Qwt5\Qwt.pyc, line 10, in __load ImportError: No module named QtSvg If you Google this last line, you'll find that I've posted this to a forum, but no one answered me. Someone has also had this problem before, although I think they were using PyInstaller and not py2exe. They say that its because Qwt has a hidden import for QtSvg. If I can turn this off, maybe it'll work, but I don't know how. I have downloaded py2exe and I run the attached setup.py file in my working directory. It creates two directories: 'dist' and 'build'. An executable is created in the 'dist' directory along with other things. When I tried running it, it produces a log file, in which I find the error messages. \quote Perhaps someone can recognize these symptoms. Someone asked this question on the PyQt mailing list, too: http://www.riverbankcomputing.com/pipermail/pyqt/2010-February/025827.html I believe it was also asked on the #pyqt IRC channel on freenode. I think I have previously referred people with py2exe/PyQt issues to this page on the PyQt Wiki: http://www.py2exe.org/index.cgi/Py2exeAndPyQt If you can somehow convince py2exe to include the QtSvg module (and presumably the libQtSvg library as well) then perhaps that will solve this problem. David -- http://mail.python.org/mailman/listinfo/python-list
Re: Apologies -- Test message
On Feb 21, 12:49 pm, Dennis Lee Bieber wlfr...@ix.netcom.com wrote: Note: The author of this message requested that it not be archived. This message will be removed from Groups in 6 days (Feb 28, 12:49 pm). I've not seen a message via Gmane in something like 36 hours... and find it hard to believe this group would be that quiet... Could it be that Gmane is giving you a taste of your own (David Copperfield) medicine? -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
Mensanator snipped: Yeah, I saw that. Funny that something important like that wasn't part of the announcement. I notice no mention of Mac OS, so visiting the website was a complete waste of time on my part, wasn't it? Oh Mensanator, why you always so grumpy? I visited your site a few years ago and i found it to be a complete waste of my time but you don't hear me whining about it do you? Besides mac is always the last to get releases (if any) everybody knows that. If you drive a porsche you can't get all upset every time you find yourself on road with pot- holes, your just not *that* important because you drive a porsche! Please (in the future) leave the ranting to me, i'm better at it ;). Thanks for the release Noam, i look forward to test driving it. hehe ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
On Feb 21, 2010, at 8:39 PM, rantingrick wrote: Mensanator snipped: Yeah, I saw that. Funny that something important like that wasn't part of the announcement. I notice no mention of Mac OS, so visiting the website was a complete waste of time on my part, wasn't it? Oh Mensanator, why you always so grumpy? I visited your site a few years ago and i found it to be a complete waste of my time but you don't hear me whining about it do you? Besides mac is always the last to get releases (if any) everybody knows that. Erm...not if the developer uses a Mac. =) -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
Just got it working in mac. Installing dependencies took a bit though. On Mon, Feb 22, 2010 at 7:38 AM, Philip Semanchuk phi...@semanchuk.comwrote: On Feb 21, 2010, at 8:39 PM, rantingrick wrote: Mensanator snipped: Yeah, I saw that. Funny that something important like that wasn't part of the announcement. I notice no mention of Mac OS, so visiting the website was a complete waste of time on my part, wasn't it? Oh Mensanator, why you always so grumpy? I visited your site a few years ago and i found it to be a complete waste of my time but you don't hear me whining about it do you? Besides mac is always the last to get releases (if any) everybody knows that. Erm...not if the developer uses a Mac. =) -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
On Feb 21, 2010, at 9:10 PM, Shashwat Anand wrote: Just got it working in mac. Installing dependencies took a bit though. I used macports and it was only 2 installs: # sudo port install py26-pygtksourceview # sudo port install py26-gtk2 It sure did install a lot of other stuff, like a new gcc(?) though; took almost an hour. S On Mon, Feb 22, 2010 at 7:38 AM, Philip Semanchuk phi...@semanchuk.com wrote: On Feb 21, 2010, at 8:39 PM, rantingrick wrote: Mensanator snipped: Yeah, I saw that. Funny that something important like that wasn't part of the announcement. I notice no mention of Mac OS, so visiting the website was a complete waste of time on my part, wasn't it? Oh Mensanator, why you always so grumpy? I visited your site a few years ago and i found it to be a complete waste of my time but you don't hear me whining about it do you? Besides mac is always the last to get releases (if any) everybody knows that. Erm...not if the developer uses a Mac. =) -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem creating executable, with PyQwt
Thanks David. Someone asked this question on the PyQt mailing list, too: http://www.riverbankcomputing.com/pipermail/pyqt/2010-February/025827.html That's my student, Helvin. I believe it was also asked on the #pyqt IRC channel on freenode. I think I have previously referred people with py2exe/PyQt issues to this page on the PyQt Wiki: http://www.py2exe.org/index.cgi/Py2exeAndPyQt If you can somehow convince py2exe to include the QtSvg module (and presumably the libQtSvg library as well) then perhaps that will solve this problem. I just did a quick test myself, and confirmed that this works for sip. I'm not at all clear what --includes arguments might be needed for QtSvg (and libQtSvg). I'll pass this info on to Helvin. Gib -- http://mail.python.org/mailman/listinfo/python-list
Re: DreamPie - The Python shell you've always dreamed about!
On Feb 21, 7:39 pm, rantingrick rantingr...@gmail.com wrote: Mensanator snipped: Yeah, I saw that. Funny that something important like that wasn't part of the announcement. I notice no mention of Mac OS, so visiting the website was a complete waste of time on my part, wasn't it? Oh Mensanator, why you always so grumpy? Part of the job requirements of a gadfly. I visited your site a few years ago and i found it to be a complete waste of my time but you don't hear me whining about it do you? Did I ever claim it wasn't? Besides mac is always the last to get releases (if any) everybody knows that. I'm not complaining about the lack of Mac support, just that it wasn't mentioned in the announcement. If you drive a porsche you can't get all upset every time you find yourself on road with pot- holes, your just not *that* important because you drive a porsche! You're not getting the point. Please (in the future) leave the ranting to me, i'm better at it ;). Thanks for the release Noam, i look forward to test driving it. hehe ;) -- http://mail.python.org/mailman/listinfo/python-list
PAPER PRESENTATIONS AND SEMIMAR TOPICS.
PAPER PRESENTATIONS AND SEMIMAR TOPICS. CHECK OUR VAST PAPER PRESENTATIONS AND SEMIMAR TOPICS INCLUDING PROJECTS FOR FREE AT http://presentationsandseminars.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficient way to break up a list into two pieces
On Sat, Feb 20, 2010 at 10:48 PM, Steven D'Aprano st...@remove-this-cybersource.com.au wrote: On Sat, 20 Feb 2010 21:21:47 -0800, Jonathan Gardner wrote: For ten items, though, is it really faster to muck around with array lengths than just copying the data over? Array copies are extremely fast on modern processors. My mistake, he actually wants l1[10:] copied. So you might be copying a huge amount of data, not just ten items. Or if you prefer, replace 10 by 1. If you need to scale that direction, it's time to install a database. Programmer time and processor time being what it is, I still think my answer is the correct one. No, it's not what he says he wants, but it is what he needs. You missed the point that your suggestion gives radically different behaviour to what the OP indicated he is using. He mutates the list in place, you rebind the list's name. That has *very* different semantics. The OP may not care about the difference, but if he does require the first behaviour, then your solution doesn't help. Correct. -- Jonathan Gardner jgard...@jonathangardner.net -- http://mail.python.org/mailman/listinfo/python-list
Re: Use eval() safely?
W. Martin Borgert wrote:
def myeval(untrustedinput):
return eval(untrustedinput, {__builtins__: None},
{ abs: abs, sin: math.sin })
Is it possible to define functions or import modules from the
untrusted input string?
This is NOT safe as it stands. It still isn't safe even if
you put nothing in the globals dict at all.
A couple of ways someone can do nasty things to you:
# Wipe out any file writable by the calling process
eval([c for c in (0).__class__.__bases__[0].__subclasses__() if c.__name__ ==
'file'][0]('/my/precious/file', 'w'))
# Use up large amounts of memory and CPU time
eval(10**10)
--
Greg
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Re: Use eval() safely?
On Mon, 22 Feb 2010 18:45:40 +1300, Gregory Ewing wrote:
W. Martin Borgert wrote:
def myeval(untrustedinput):
return eval(untrustedinput, {__builtins__: None},
{ abs: abs, sin: math.sin })
Is it possible to define functions or import modules from the untrusted
input string?
This is NOT safe as it stands. It still isn't safe even if you put
nothing in the globals dict at all.
It's *especially* not safe if you put nothing in the globals dict,
because Python kindly rectifies that by putting the builtins into it:
eval(__builtins__.keys(), {}, {})
['IndexError', 'all', 'help', 'vars', ... 'OverflowError']
eval(globals(), {}, {})
{'__builtins__': {...}}
eval(globals(), {'__builtins__': None}, {})
Traceback (most recent call last):
File stdin, line 1, in module
File string, line 1, in module
NameError: name 'globals' is not defined
So {'__builtins__': None} is safer than {}. Still not safe, exactly, but
safer. Or at least you make the Black Hats work harder before they own
your server :)
--
Steven
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Re: Reading a large bz2 textfile exits early
Am 02/21/10 22:09, schrieb Dennis Lee Bieber: On Sat, 20 Feb 2010 23:12:50 +0100, Norman Rießnor...@smash-net.org declaimed the following in comp.lang.python: Hello, i am trying to read a large bz2 compressed textfile using the bz2 module. The file is 1717362770 lines long and 8GB large. Using this code source_file = bz2.BZ2File(file, r) for line in source_file: print line.strip() print Exiting print I used file: + file the loop exits cleanly after 4311 lines in midline and the prints are executed. This happened on two different boxes runnig different brands of linux. Is there something i miss or should be done differently? Please verify your indentation! What you posted above is invalid in many ways. I am sorry, the indentation suffered from pasting. This is the actual code: source_file = bz2.BZ2File(file, r) for line in source_file: print line.strip() print Exiting print I used file: + file -- http://mail.python.org/mailman/listinfo/python-list
[issue7751] urllib.urlopen(///C|/foo/bar/spam.foo) IOError: [Errno 22]
Éric Araujo mer...@netwok.org added the comment: Ok, thanks for clarifying :) Regards -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7751 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3426] os.path.abspath with unicode argument should call os.getcwdu
Ezio Melotti ezio.melo...@gmail.com added the comment: Fixed in r78247 (trunk) and r78248 (release26-maint) (plus a fix in r78272 and r78279 to avoid test failures when the filesystem encoding is ascii). I didn't use the any_cwd decorator -- I might consider it in future if it turns out that there are more tests like these. -- dependencies: -Add a context manager to change cwd in test.test_support and run the test suite in a temp dir. resolution: - fixed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3426 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue4999] multiprocessing.Queue does not order objects
Stefan Krah stefan-use...@bytereef.org added the comment: I think it would be nice to update the documentation if this isn't resolved yet. The patch adds a warning that FIFO behavior is not guaranteed. -- keywords: +patch nosy: +skrah Added file: http://bugs.python.org/file16276/warn_fifo.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4999 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5211] Fix complex type to avoid coercion in 2.7.
Mark Dickinson dicki...@gmail.com added the comment: Apologies for the delay; tomorrow was a long time coming... The patch looks great---thank you! I added a .. versionchanged note to the documentation, and fixed a couple of whitespace issues; apart from that I didn't change anything. Applied in r78280. -- resolution: - accepted stage: - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5211 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2395] [Py3k] struct module changes of PEP 3118
Mark Dickinson dicki...@gmail.com added the comment: I think this can be closed as a duplicate of issue 3132. (Yes, this issue came first, but all the interesting(?) discussion is over in issue 3132.) -- dependencies: -implement PEP 3118 struct changes nosy: +mark.dickinson resolution: - duplicate status: open - closed superseder: - implement PEP 3118 struct changes ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2395 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3132] implement PEP 3118 struct changes
Mark Dickinson dicki...@gmail.com added the comment: [Meador Inge] So the next step is to kick off a thread on python-dev summarizing the questions\problems we have come up with? I can get that started. Sounds good. I'd really like to see some examples of how these struct-module additions would be used in real life. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3132 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7384] curses crash on FreeBSD
Mark Dickinson dicki...@gmail.com added the comment: It does appear that curses itself is broken on FreeBSD Rereading this, it doesn't say what I meant it to say: I meant that the Python curses module seems to be broken, not that the system-level curses library is broken (though that seems possible too). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7384 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7974] Valgrind error when running Python command within Vim
New submission from Dominique Pellé dominique.pe...@gmail.com:
I built Vim-7.2.368 editor with python interpreter using
Python-2.6.4 library on Linux x86.
When I run a python command (any command, it does not matter)
in the Vim editor with Valgrind memory checker, I see valgrind
errors within the Python library. It looks to me like they
are errors within the Python library and not errors in Vim.
I attach the valgrind error log file.
Steps to reproduce the bug:
1/ Download compile Vim with python interpreter
$ hg clone https://vim.googlecode.com/hg/ vim
$ cd vim
$ ./configure --enable-pythoninterp
--with-python-config-dir=/usr/local/lib/python2.6/config
$ make
(you may also want to tweak vim/src/Makefile to compile with -O0 -g
to have more interesting stacks in valgrind logs)
2/ Run a Python command within Vim with Valgrind memory checker:
$ cd vim/src
$ valgrind --log-file=valgrind.log ./vim -c ':python foo=0'
3/ Observe in valgrind.log the errors in Python lib
The stack is quite deep in the errors and Valgrind memory checker has a limit
to dump at most 50 functions in stack frame. I increased that limit to 100 to
be able to see the full stack trace as in attached log file valgrind.log.
In the fist error in attached valgrind.log, memory is used in a
buffer that has already been freed. Looking at the Python
code, this function does not make much sense to me:
1040 PyObject *
1041 PyMarshal_ReadLastObjectFromFile(FILE *fp)
1042 {
1043 /* 75% of 2.1's .pyc files can exploit SMALL_FILE_LIMIT.
1044 * REASONABLE_FILE_LIMIT is by defn something big enough for Tkinter.pyc.
1045 */
1046 #define SMALL_FILE_LIMIT (1L 14)
1047 #define REASONABLE_FILE_LIMIT (1L 18)
1048 #ifdef HAVE_FSTAT
1049 off_t filesize;
1050 #endif
1051 #ifdef HAVE_FSTAT
1052 filesize = getfilesize(fp);
1053 if (filesize 0) {
1054 char buf[SMALL_FILE_LIMIT];
1055 char* pBuf = NULL;
1056 if (filesize = SMALL_FILE_LIMIT)
1057 pBuf = buf;
1058 else if (filesize = REASONABLE_FILE_LIMIT)
1059 pBuf = (char *)PyMem_MALLOC(filesize);
1060 if (pBuf != NULL) {
1061 PyObject* v;
1062 size_t n;
1063 /* filesize must fit into an int, because it
1064is smaller than REASONABLE_FILE_LIMIT */
1065 n = fread(pBuf, 1, (int)filesize, fp);
1066 v = PyMarshal_ReadObjectFromString(pBuf, n);
1067 if (pBuf != buf)
1068 PyMem_FREE(pBuf);
1069 return v;
1070 }
1071
1072 }
1073 #endif
1074 /* We don't have fstat, or we do but the file is larger than
1075 * REASONABLE_FILE_LIMIT or malloc failed -- read a byte at a time.
1076 */
1077 return PyMarshal_ReadObjectFromFile(fp);
1078
1079 #undef SMALL_FILE_LIMIT
1080 #undef REASONABLE_FILE_LIMIT
1081 }
Memory is allocated for pBuf at line marshal.c:1059.
Then at line marshall.c:1066 v= PyMarshal_ReadObjectFromString(pBuf, n);
is called.
The v structure contains pointer to the pBuf buffer (see line marshall.c:1103).
Then pBuf is freed at marshall.c:1068 and v is returned.
So v which is returned contains a pointer v.ptr to buffer
that has just been freed. That looks wrong to me. What's the
point of v containing an address to something freed?
Looking at the latest version of Python/marshal.c in SVN,
this function has not been changed since 2.6.4:
http://svn.python.org/projects/python/trunk/Python/marshal.c
--
components: Library (Lib)
files: valgrind.log.gz
messages: 99660
nosy: dominiko
severity: normal
status: open
title: Valgrind error when running Python command within Vim
versions: Python 2.6
Added file: http://bugs.python.org/file16277/valgrind.log.gz
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[issue7974] Valgrind error when running Python command within Vim
Mark Dickinson dicki...@gmail.com added the comment: The code you identify looks okay to me: in PyMarshal_ReadObjectFromString, isn't it only the temporary variable rf that has a pointer to the string? Have you read Misc/README.valgrind in the Python source? -- nosy: +mark.dickinson ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7974 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7974] Valgrind error when running Python command within Vim
Dominique Pellé dominique.pe...@gmail.com added the comment: Have you read Misc/README.valgrind in the Python source? No, I had not see this file. Thanks for pointing it to me. I've just read it, reconfigured recompiled Python-2.6.4 with: ./configure --without-pymalloc It now runs without Valgrind error. Sorry for the noise. This issue can thus be closed -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7974 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7974] Valgrind error when running Python command within Vim
Dominique Pellé dominique.pe...@gmail.com added the comment: Closed: this was not a bug, I had to build Python lib with configure --without-pymalloc to avoid valgrind errors. -- status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7974 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2636] Regexp 2.7 (modifications to current re 2.2.2)
Alex Willmer a...@moreati.org.uk added the comment:
On 17 February 2010 19:35, Matthew Barnett rep...@bugs.python.org wrote:
The main text at http://pypi.python.org/pypi/regex appears to have lost its
backslashes, for example:
  The Unicode escapes u and U are supported.
instead of:
  The Unicode escapes \u and \U are supported.
Matthew, As you no doubt realised that text is read straight from the
Features.txt file. PyPI interprets it as RestructuredText, which uses
\ as an escape character in various cases. Do you intentionally write
Features.txt as RestructuredText? If so here is a patch that escapes
the \ characters as appropriate, otherwise I'll work out how to make
PyPI read it as plain text.
Regards, Alex
--
Alex Willmer a...@moreati.org.uk
http://moreati.org.uk/blog
--
Added file: http://bugs.python.org/file16278/Features-backslashes.patch
___
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http://bugs.python.org/issue2636
___=== modified file 'Features.txt'
--- Features.txt2010-02-17 12:22:14 +
+++ Features.txt2010-02-21 14:44:13 +
@@ -61,7 +61,7 @@
regex.findall and regex.finditer support an 'overlapped' flag which
permits overlapped matches
Unicode escapes (#3665)
-The Unicode escapes \u and \U are supported.
+The Unicode escapes \\u and \\U are supported.
Large patterns (#1160)
Patterns can be much larger.
@@ -94,23 +94,23 @@
Named groups can be named with (?name...) as well as the current
(?Pname...).
Group references
-Groups can be referenced within a pattern with \gname. This also allows
there to be more than 99 groups.
+Groups can be referenced within a pattern with \\gname. This also allows
there to be more than 99 groups.
Named characters
-\N{name}
+\\N{name}
Named characters are supported.
Unicode properties
-\p{name}
-\P{name}
-Unicode properties are supported. \p{name} matches a character which has
property 'name' and \P{name} matches a character which doesn't have property
'name'.
+\\p{name}
+\\P{name}
+Unicode properties are supported. \\p{name} matches a character which has
property 'name' and \\P{name} matches a character which doesn't have property
'name'.
Posix character classes
[[:alpha:]]
Posix character classes are supported.
Search anchor
-\G
+\\G
A search anchor has been added. It matches at the position where each
search started/continued and can be used for contiguous matches or in negative
variable-length lookbehinds to limit how far back the lookbehind goes:
regex.findall(r\w{2}, abcd ef)
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[issue7974] Valgrind error when running Python command within Vim
Mark Dickinson dicki...@gmail.com added the comment: Thanks for the update! -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7974 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7974] Valgrind error when running Python command within Vim
Changes by Mark Dickinson dicki...@gmail.com: -- resolution: - invalid ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7974 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7975] dbshelve.py throws exception: AttributeError: 'DB' object has no attribute '__iter__'
New submission from Adam Collard adam.coll...@gmail.com: Originally reported at: https://bugs.edge.launchpad.net/bugs/384602 In Python 2.6, the dbshelve.py module throws an AttributeError exception whenever a call is made to a method that depends upon an __iter__ method. The exception is: File /usr/lib/python2.6/bsddb/dbshelve.py, line 167, in __iter__ return self.db.__iter__() AttributeError: 'DB' object has no attribute '__iter__' This means that, if mydb is an istance of a DB object, the following examples will fail: for key in mydb: print key print (k for k in mydb.iterkeys()) for k, d in mydb.itervalues(): print k, d and many other statements depending on iterable(mydb) being true Note that, in Python 2.5, these examples work and no exception is thrown. In fact, if you have both 2.5 and 2.6 installed on the same system, you can run the same program containing code as above with Python2.5 without issue while running it under Python 2.6 raises the exception seen above. -- messages: 99667 nosy: adam-collard severity: normal status: open title: dbshelve.py throws exception: AttributeError: 'DB' object has no attribute '__iter__' ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7975 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7975] dbshelve.py throws exception: AttributeError: 'DB' object has no attribute '__iter__'
R. David Murray rdmur...@bitdance.com added the comment: Could you please provide a complete example that demonstrates the problem? A naive example using shelve with a dbhash database seems to work fine. -- nosy: +r.david.murray priority: - normal stage: - test needed type: - behavior versions: +Python 2.6, Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7975 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1722344] Thread shutdown exception in Thread.notify()
sorin sorin.sbar...@gmail.com added the comment: Any idea if there is a nightly build for Python 2.6? The latest release was 2.6.4 and was 2 days before submitting the patch. Or the only alternative is to build it myself? Any ideas on when we could see 2.6.5? - I tried to look for a release timeline but I wasn't able to locate one. -- nosy: +sorin ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1722344 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7975] dbshelve.py throws exception: AttributeError: 'DB' object has no attribute '__iter__'
Adam Collard adam.coll...@gmail.com added the comment: Attached a simple example. -- Added file: http://bugs.python.org/file16280/dbshelve_example.py ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7975 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7977] I found Python 3.1 xmlrpc lib use param not properly. and i have fixed it.
Mark Dickinson dicki...@gmail.com added the comment: Please could you generate and upload a patch against the Python source? (For Windows, you can do this using the WinMerge tool, amongst others.) I'm unable to open the file you attached on my machine: No application knows how to open ... xmlrpc.client.modify.rar. If you could explain how param is being used improperly, that might also help. -- nosy: +mark.dickinson ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7977 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7900] posix.getgroups() failure on Mac OS X
Martin v. Löwis mar...@v.loewis.de added the comment: I would suggest using my _DARWIN_C_SOURCE implementation unconditionally and make similar changes to posix_setgroups, but this is probably a subject for a separate issue. I would propose a different strategy: if _SC_NGROUPS_MAX is defined, use that to find out how much memory to allocate, otherwise, fall back to the current max array size. Can you find out whether doing so would also fix the issue at hand? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7900 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3132] implement PEP 3118 struct changes
Mark Dickinson dicki...@gmail.com added the comment: About long doubles again: I just encountered someone on the #python IRC channel who wanted to know whether struct.pack and struct.unpack supported reading and writing of x87 80-bit long doubles (padded to 12 bytes each in the input). A few quotes from him/her, with permission (responses from others, including me, edited out; I can supply a fuller transcript if necessary, but I hope what's below isn't misleading). [18:39] bdesk: Hi, is struct.pack able to handle 80-bit x86 extended floats? [18:40] bdesk: How can I read and write these 80-bit floats, in binary, using python? [18:44] bdesk: dickinsm: I have a C program that uses binary files as input and output, and I want to deal with these files using python if possible. [18:49] bdesk: I don't need to do arithmetic with the full 80 bits of precision within the python program, although It would be better if I could. [18:50] bdesk: I would need to use the float in a more semantically useful manner than treating it as a black box of 12 bytes. [18:55] bdesk: Until python gets higher precision floats, my preferred interface would be to lose some precision when unpacking the floats. The main thing that I realized from this is that unpacking as a ctypes long double isn't all that useful for someone who wants to be able to do arithmetic on the unpacked result. And if you don't want to do arithmetic on the unpacked result, then you're probably just shuffling the bytes around without caring about their meaning, so there's no need to unpack as anything other than a sequence of 12 bytes. On the other hand, I suppose it's enough to be able to unpack as a ctypes c_longdouble and then convert to a Python float (losing precision) for the arithmetic. Alternatively, we might consider simply unpacking a long double directly into a Python float (and accepting the loss of precision); that seems to be what would be most useful for the use-case above. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3132 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7975] dbshelve.py throws exception: AttributeError: 'DB' object has no attribute '__iter__'
R. David Murray rdmur...@bitdance.com added the comment: The bug seems to have been introduced by an incomplete or incorrect translation to the newer idiom (DictMixin to MutableMapping). Since bsddb is gone in py3, I'm inclined to fix it by just going back to using DictMixin. There are no tests for the DictMixin functionality added in Python 2.3. -- components: +Library (Lib) keywords: +easy nosy: +jcea ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7975 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6436] trace module doesn't seem to produce .cover files for Py3 (but does for Py2)
Michael Newman michael.b.new...@gmail.com added the comment: I noticed the same behavior today. Let's consider a test case using my python script version_check.py (attached). Normally the script does the following on my Ubuntu 9.10 box: # Python 2.6 example: m...@ebx2009:~/test$ which python /usr/bin/python m...@ebx2009:~/test$ python version_check.py 2.6.4 (r264:75706, Dec 7 2009, 18:45:15) [GCC 4.4.1] # Python 3.1 example: m...@ebx2009:~/test$ which python3 /usr/local/bin/python3 m...@ebx2009:~/test$ python3 version_check.py 3.1.1 (r311:74480, Feb 7 2010, 16:32:28) [GCC 4.4.1] # Starting with a directory with only the script in it: m...@ebx2009:~/test$ ls version_check.py # I use the -C . to force the .cover files to be dumped in my current directory: m...@ebx2009:~/test$ python -m trace --count -C . version_check.py 2.6.4 (r264:75706, Dec 7 2009, 18:45:15) [GCC 4.4.1] m...@ebx2009:~/test$ ls threading.cover version_check.cover version_check.py # So this worked fine. # Let's remove the cover files and try with Python 3.1: m...@ebx2009:~/test$ rm *.cover m...@ebx2009:~/test$ ls version_check.py m...@ebx2009:~/test$ python3 -m trace --count -C . version_check.py 3.1.1 (r311:74480, Feb 7 2010, 16:32:28) [GCC 4.4.1] m...@ebx2009:~/test$ ls threading.cover version_check.py # Its annoying that the threading.cover is still being made, but version_check.cover did not get generated in any case... I tracked the problem down inside of lib/trace.py (same code in both python versions): def localtrace_count(self, frame, why, arg): if why == line: filename = frame.f_code.co_filename print(frame.f_code.co_filename) # my new debug line lineno = frame.f_lineno key = filename, lineno self.counts[key] = self.counts.get(key, 0) + 1 return self.localtrace If you put my print debug line in, we get some more interesting behavior from my example runs: m...@ebx2009:~/test$ python -m trace --count -C . version_check.py /usr/lib/python2.6/threading.py string version_check.py version_check.py version_check.py version_check.py version_check.py version_check.py 2.6.4 (r264:75706, Dec 7 2009, 18:45:15) [GCC 4.4.1] m...@ebx2009:~/test$ python3 -m trace --count -C . version_check.py /usr/local/lib/python3.1/threading.py string string string string string string string 3.1.1 (r311:74480, Feb 7 2010, 16:32:28) [GCC 4.4.1] So python3 is not retaining the module name correctly. Instead its just giving string. So the bottom line is frame.f_code.co_filename is now behaving differently. I'm not sure how to fix that. -- nosy: +mnewman versions: +Python 3.2 Added file: http://bugs.python.org/file16282/version_check.py ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6436 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7806] httplib.HTTPConnection.getresponse closes socket which destroys the response
Jeremy Hylton jer...@alum.mit.edu added the comment: On Sat, Feb 20, 2010 at 12:06 AM, R. David Murray rep...@bugs.python.org wrote: R. David Murray rdmur...@bitdance.com added the comment: But the docs (which presumably describe the API) say that the socket is unusable after the call to close, which argues that the paramiko sockets are following the documented API. Do the docs need to be corrected? I mean the documented socket API. Jeremy -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7806 ___ -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7806 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7806] httplib.HTTPConnection.getresponse closes socket which destroys the response
Jeremy Hylton jer...@alum.mit.edu added the comment: In particular, I mean this part of the socket API: socket.makefile([mode[, bufsize]]) Return a file object associated with the socket. (File objects are described in File Objects.) The file object references a dup()ped version of the socket file descriptor, so the file object and socket object may be closed or garbage-collected independently. The socket must be in blocking mode (it can not have a timeout). The optional mode and bufsize arguments are interpreted the same way as by the built-in file() function. The language may be a little vague, but it means that closing the file generated by makefile() should not close the underlying socket. Jeremy On Sun, Feb 21, 2010 at 3:23 PM, Jeremy Hylton rep...@bugs.python.org wrote: Jeremy Hylton jer...@alum.mit.edu added the comment: On Sat, Feb 20, 2010 at 12:06 AM, R. David Murray rep...@bugs.python.org wrote: R. David Murray rdmur...@bitdance.com added the comment: But the docs (which presumably describe the API) say that the socket is unusable after the call to close, which argues that the paramiko sockets are following the documented API. Do the docs need to be corrected? I mean the documented socket API. Jeremy -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7806 ___ -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7806 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/jeremy%40alum.mit.edu -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7806 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7929] Update copyright notice on python websites to 2010
Michael Newman michael.b.new...@gmail.com added the comment: Perhaps this is now really a bug: # Response to e-mail to webmas...@python.org: # This is the mail system at host mail.python.org. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system webmaster-reply...@mail.python.org (expanded from webmas...@python.org): Command died with status 1: /usr/bin/replybot -C /etc/replybot.cfg -s WEBMASTER. Command output: Traceback (most recent call last): File /usr/bin/replybot, line 5, in module from pkg_resources import load_entry_point ImportError: No module named pkg_resources Final-Recipient: rfc822; webmaster-reply...@mail.python.org Original-Recipient: rfc822;webmas...@python.org Action: failed Status: 5.3.0 Diagnostic-Code: x-unix; Traceback (most recent call last): File /usr/bin/replybot, line 5, in module from pkg_resources import load_entry_point ImportError: No module named pkg_resources -- Forwarded message -- From: Michael Newman michael.b.new...@gmail.com To: webmas...@python.org Date: Sun, 21 Feb 2010 15:31:31 -0500 Subject: please update copyright to show 2010 Please consider fixing this bug: Update copyright notice on python websites to 2010 http://bugs.python.org/issue7929 Thanks for maintaining a great website. -Mike -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7929 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7806] httplib.HTTPConnection.getresponse closes socket which destroys the response
R. David Murray rdmur...@bitdance.com added the comment: So do I. I'm saying that paramiko appears to be following the socket API as documented in the python docs (ie: that closing the socket means it is no longer usable). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7806 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7929] Update copyright notice on python websites to 2010
Michael Newman michael.b.new...@gmail.com added the comment: I posted the copyright note, and the reply bot bug on the wiki at: http://wiki.python.org/moin/SiteImprovements -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7929 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7806] httplib.HTTPConnection.getresponse closes socket which destroys the response
R. David Murray rdmur...@bitdance.com added the comment: So HTTConnection is closing the thing returned by makefile and that is closing the socket, except that the socket library makes sure it doesn't actually close the socket until the dupped file handle is also closed? I guess I need to look at this more closely when I have time in order to fully understand it. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7806 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1722344] Thread shutdown exception in Thread.notify()
Amaury Forgeot d'Arc amaur...@gmail.com added the comment: I have seen somewhere (ask google), that python 2.6.5 would be released mid-march. But except for a few platforms, python.org does not provide compiled binaries. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1722344 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7964] -m pdb SyntaxError for \r\n formatted py files
Jason R. Coombs jar...@jaraco.com added the comment: I'm interested in finding a workaround for this issue in the next 24 hours. I can also help contribute a test case. I'll investigate further. -- nosy: +jaraco ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7964 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7929] Update copyright notice on python websites to 2010
Martin v. Löwis mar...@v.loewis.de added the comment: Closing as fixed, as the replybot issue is listed on the wiki. -- resolution: - fixed status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7929 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
