pySerial 2.5-rc2 (2nd release candidate)
I'm happy to announce a release candidate of pySerial: 2.5-rc2 http://pyserial.sourceforge.net/ Whats new since rc1: - Several small bugfixes. - updated RFC2217 implementation, client support. - changed Posix read implementation (error handling for disconnected devices) - See CHANGES.txt in the distribution for full list. Source archive and Windows installers can be downloaded from here: http://sourceforge.net/projects/pyserial/files/ The Windows installer for Python 3.x has py3k in its name, the other one is for Python 2.x. The source archive's setup.py should automatically convert using 2to3 when run with Python 3.x. chris -- What is pySerial? Quoting from the home page: This module encapsulates the access for the serial port. It provides backends for Python running on Windows, Linux, BSD (possibly any POSIX compliant system), Jython and IronPython (.NET and Mono). The module named serial automatically selects the appropriate backend. -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
[ANNOUNCE] PyGobject 2.21.1 - unstable
I am pleased to announce version 2.21.1 of the Python bindings for GObject. The new release is available from ftp.gnome.org as and its mirrors as soon as its synced correctly: http://download.gnome.org/sources/pygobject/2.21/ What's new since PyGObject 2.21.0? - Wrap gio.Volume.eject_with_operation (Gian Mario) - Wrap gio.Mount.eject_with_operation (Gian Mario) - Wrap gio.Mount.unmount_mountable_with_operation (Gian Mario) - Wrap File.unmount_mountable_with_operation (Gian Mario) - Wrap gio.File.stop_mountable (Gian Mario) - Wrap gio.File.start_mountable (Gian Mario) - Wrap gio.File.replace_readwrite_async (Gian Mario) - Wrap gio.File.poll_mountable (Gian Mario) - Wrap gio.File.open_readwrite_async (Gian Mario) - Wrap gio.File.eject_mountable_with_operation (Gian Mario) - Wrap gio.File.create_readwrite_async (Gian Mario) - Wrap gio.Drive.stop (Gian Mario) - Wrap gio.Drive.start (Gian Mario) - Wrap gio.SocketListener.accept_socket_async|finish (Gian Mario) - Wrap gio.SocketListener.accept_finish (Gian Mario) - Wrap gio.SocketListener.accept_async (Gian Mario) - Wrap gio.SocketListener.accept_socket (Gian Mario) - Wrap gio.SocketListener.accept (Gian Mario) - Make cancellable optional in gio.SocketClient.connect_to_host (Gian Mario) - Wrap gio.SocketListener.add_address (Gian Mario) - Wrap gio.SocketClient.connect_to_service_async (Gian Mario) - Wrap gio.SocketClient.connect_to_host_async (Gian Mario) - Wrap gio.SocketClient.connect_async (Gian Mario) - Wrap gio.SocketAddressEnumerator.next_async (Gian Mario) - Add a missing object gio.InetSocketAddress new in GIO 2.22 (Gian Mario) - Make cancellable optional for gio.SocketAddressEnumerator.next (Gian Mario) - Wrap gio.Socket.condition_wait (Gian Mario) - Wrap gio.Socket.condition_check (Gian Mario) - Wrap gio.Resolver.lookup_service_finish (Gian Mario) - Wrap gio.Resolver.lookup_service_async (Gian Mario) - Wrap gio.Resolver.lookup_service (Gian Mario) - Wrap gio.Resolver.lookup_by_address_async (Gian Mario) - Wrap gio.Resolver.lookup_by_name_finish (Gian Mario) - Wrap gio.Drive.eject_with_data (Gian Mario) - Deprecate old gio.Drive methods (Gian Mario) - Wrap gio.Resolver.lookup_by_name (Gian Mario) - Make cancellable optional in gio.Resolver.lookup_by_address (Gian Mario) - Strip g_ prefix for many other functions (Gian Mario) - Strip g_ prefix from InetAddress functions (Gian Mario) - Fix function name gio.resolver_get_default (Gian Mario) - Wrap gio.FileIOStream.query_info_async (Gian Mario) - Register enums and flags in PyGI if needed (Tomeu Vizoso, #603534) - Wrap gio.IOStream.close_async (Gian Mario) - Make cancellable optional in GFile.create_readwrite (Gian Mario) - Remove a duplicate entry in gio.defs (Gian Mario) - Wrap gio.FileInfo.set_modification_time (Gian Mario) - Wrap gio.EmblemedIcon.get_emblems (Gian Mario) - Update Enums and Flags with new API (Gian Mario) - Fix handling of uchar in pyg_value_from_pyobject (Bastian Winkler) Blurb: GObject is a object system library used by GTK+ and GStreamer. PyGObject provides a convenient wrapper for the GObject library for use in Python programs, and takes care of many of the boring details such as managing memory and type casting. When combined with PyGTK, PyORBit and gnome-python, it can be used to write full featured Gnome applications. Like the GObject library itself PyGObject is licensed under the GNU LGPL, so is suitable for use in both free software and proprietary applications. It is already in use in many applications ranging from small single purpose scripts up to large full featured applications. PyGObject requires glib = 2.22.4 and Python = 2.3.5 to build. GIO bindings require glib = 2.22.4. Please remember that this is an unstable release and shouldn't be used in production. cheers -- Gian Mario Tagliaretti GNOME Foundation member gia...@gnome.org -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: Dynamic text color
John, Interesting and confusing... I tested my code on Ubuntu 8.04, Win XP and 7, and WinMob before I called it good. And of course your modifications work on all too. * rename get_position() to get_complete_text() * replace new_Rword(), new_Bword(), and new_Gword() with a single function that has an extra parameter, color. The first easy, the second is going to take some thinking Keep at it I will. I am hooked!!! Being able to write once and run on all of the above platforms is amazing!!! Thanks again!!! Dave John Posner wrote: On Sat, Jan 2, 2010 at 1:47 PM, Dave McCormick wrote: WooHoo!!! I got it!!! Yup, I am sure it can be optimized but it works!!! Dave, please ignore a couple of my bogus complaints in the previous message: ... you call function new_Rword() before you define it ... this version also has the advantage of defining each function just once, instead of multiple times on each keystroke But I stand by my overall statement that the program didn't work for me, and that rearranging the lines produces a working program. -John -- http://mail.python.org/mailman/listinfo/python-list
What is the best data structure for a very simple spreadsheet?
Hi, Not sure this is the best group to post, but I cannot think of any other. My application would contain a limited set of cells represented by the instances of a Cell class: class Cell: ... A1=Cell(7) A2=Cell(2*A1) A3=Cell(3*A1+A2) A4=Cell(A3*4) Of course, A1 = 7, A2 = 14, A3 = 35 and A4 = 140 Now, I somehow want to be able to show a dependency tree 1 level dependency trees A1: None A2: A1 A3: A1, A2 A4: A3 All levels dependency trees A1: None A2: A1 A3: A1, A2 A4: A3, A2, A1 Leaf + values dependency trees: A1: 7 A2: A1=7, 2 A3: 3, A1=7, 2 A4: 3, A1=7, 2, 4 What I'd like to know is: 1) what are, in your opinion, the basic elements of the Cell class? 2) Do I need a parser to evaluate the formulas like “3*A1+A2”? Can you recommend one library that already contains one? 3) Do I need a tree data structure to represent my data? would the tree be an attribute of the class instance? I imagine a lot can be said on these questions. What I am looking for is some hints that help me get out of where I am now. Any help is highly appreciated. Vicente Soler -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows 7 : any problems installing or running Python ?
David, Try disabling your firewall software momentarily to see if that makes a difference. IDLE uses a local port for inter-process communication - you may need to configure your firewall to allow IDLE's port usage. To test whether Python itself has been properly installed, open up a cmd prompt, change your current directory to the folder where you installed Python, create the short, 1 line script that follows, and then run it. If this works, then Python has been successfully installed on your workstation and the problem you're having is specific to IDLE. 1 line script (place in hello.py) print Hello world Command line to run above script: python hello.py You might also try installing an alternate Python build, eg. if you installed from python.org, then try one of the setups from ActiveState. Or vice-versa. We're running Python 2.6.4 on Windows XP (32-bit), Windows Vista (32 and 64-bit), and Windows 7 (32 and 64-bit) without problem. Good luck! Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the best data structure for a very simple spreadsheet?
On Sun, 03 Jan 2010 03:27:46 -0800, vsoler wrote:
My application would contain a limited set of cells represented by the
instances of a Cell class:
class Cell:
...
A1=Cell(7)
A2=Cell(2*A1)
A3=Cell(3*A1+A2)
A4=Cell(A3*4)
Of course, A1 = 7, A2 = 14, A3 = 35 and A4 = 140
Now, I somehow want to be able to show a dependency tree
1 level dependency trees
A1: None
A2: A1
A3: A1, A2
A4: A3
All levels dependency trees
A1: None
A2: A1
A3: A1, A2
A4: A3, A2, A1
Leaf + values dependency trees:
A1: 7
A2: A1=7, 2
A3: 3, A1=7, 2
A4: 3, A1=7, 2, 4
What I'd like to know is:
1) what are, in your opinion, the basic elements of the Cell class?
def Cell(object):
def __init__(self, payload):
self.payload = payload
def __str__(self):
return str(self.payload)
def __float__(self):
return float(self.payload)
def dependency(self):
try:
return self.payload.dependency()
except AttributeError:
return ['None']
Cells can contain one of three things: a number, a string, or a formula.
The first two can be supported by providing a built-in Python object
(float or str) as payload. You can support formulae two ways that I can
think of:
(1) Provide a formula as a string, with a leading '='. Then, whenever you
want to evaluate such a cell, you fetch the string from the cell, parse
it, generate an arithmetic expression, and calculate it.
(2) Instead of parsing the formula on every single spreadsheet refresh,
use a couple of helper classes:
class Indirect(object):
def __init__(self, ref, sheet=None):
if sheet is None:
self.sheet = default_sheet()
else:
self.sheet = sheet
self.ref = ref
def __str__(self):
return str(self.sheet[self.ref])
def float(self):
return float(self.sheet[self.ref])
def dependency(self):
return [self.ref]
class Formula(object):
def __init__(self, x, y, op):
self.x = x
self.y = y
self.op = op
def eval(self):
return self.op(float(x), float(y))
def dependency(self):
return self.x.dependency(level) + self.y.dependency(level)
Then do something like this:
sheet = {}
sheet['A1'] = Cell(7)
sheet['A2'] = Cell(Formula(2, Indirect('A1'), operator.mul))
sheet['A3'] = Cell(
Formula(
Formula(3, Indirect('A1'), operator.mul),
Indirect('A2'),
operator.add
))
sheet['A4'] = Cell(Formula(Indirect('A3'), 4, operator.mul))
Then you only need to parse each human-readable formula like '=2*A1' once.
2) Do I need a parser to evaluate the formulas like “3*A1+A2”?
Yes.
Can you recommend one library that already contains one?
Try PyParsing.
3) Do I need a tree
data structure to represent my data? would the tree be an attribute of
the class instance?
I suspect a dict will be faster.
To get the dependencies of each cell:
for key, value in sheet.items():
print key, value.dependency()
Keep in mind I haven't tested ANY of this -- it is entirely stream of
consciousness. I've never actually done this, so I have no idea whether
it is a good approach or not, but it seems to me that it might be.
--
Steven
--
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Re: What is the best data structure for a very simple spreadsheet?
On Jan 3, 1:28 pm, Steven D'Aprano st...@remove-this-
cybersource.com.au wrote:
On Sun, 03 Jan 2010 03:27:46 -0800, vsoler wrote:
My application would contain a limited set of cells represented by the
instances of a Cell class:
class Cell:
...
A1=Cell(7)
A2=Cell(2*A1)
A3=Cell(3*A1+A2)
A4=Cell(A3*4)
Of course, A1 = 7, A2 = 14, A3 = 35 and A4 = 140
Now, I somehow want to be able to show a dependency tree
1 level dependency trees
A1: None
A2: A1
A3: A1, A2
A4: A3
All levels dependency trees
A1: None
A2: A1
A3: A1, A2
A4: A3, A2, A1
Leaf + values dependency trees:
A1: 7
A2: A1=7, 2
A3: 3, A1=7, 2
A4: 3, A1=7, 2, 4
What I'd like to know is:
1) what are, in your opinion, the basic elements of the Cell class?
def Cell(object):
def __init__(self, payload):
self.payload = payload
def __str__(self):
return str(self.payload)
def __float__(self):
return float(self.payload)
def dependency(self):
try:
return self.payload.dependency()
except AttributeError:
return ['None']
Cells can contain one of three things: a number, a string, or a formula.
The first two can be supported by providing a built-in Python object
(float or str) as payload. You can support formulae two ways that I can
think of:
(1) Provide a formula as a string, with a leading '='. Then, whenever you
want to evaluate such a cell, you fetch the string from the cell, parse
it, generate an arithmetic expression, and calculate it.
(2) Instead of parsing the formula on every single spreadsheet refresh,
use a couple of helper classes:
class Indirect(object):
def __init__(self, ref, sheet=None):
if sheet is None:
self.sheet = default_sheet()
else:
self.sheet = sheet
self.ref = ref
def __str__(self):
return str(self.sheet[self.ref])
def float(self):
return float(self.sheet[self.ref])
def dependency(self):
return [self.ref]
class Formula(object):
def __init__(self, x, y, op):
self.x = x
self.y = y
self.op = op
def eval(self):
return self.op(float(x), float(y))
def dependency(self):
return self.x.dependency(level) + self.y.dependency(level)
Then do something like this:
sheet = {}
sheet['A1'] = Cell(7)
sheet['A2'] = Cell(Formula(2, Indirect('A1'), operator.mul))
sheet['A3'] = Cell(
Formula(
Formula(3, Indirect('A1'), operator.mul),
Indirect('A2'),
operator.add
))
sheet['A4'] = Cell(Formula(Indirect('A3'), 4, operator.mul))
Then you only need to parse each human-readable formula like '=2*A1' once.
2) Do I need a parser to evaluate the formulas like “3*A1+A2”?
Yes.
Can you recommend one library that already contains one?
Try PyParsing.
3) Do I need a tree
data structure to represent my data? would the tree be an attribute of
the class instance?
I suspect a dict will be faster.
To get the dependencies of each cell:
for key, value in sheet.items():
print key, value.dependency()
Keep in mind I haven't tested ANY of this -- it is entirely stream of
consciousness. I've never actually done this, so I have no idea whether
it is a good approach or not, but it seems to me that it might be.
--
Steven
WOW!!!
After lunch I am going to read your post thoroughly, but I can already
see that you've put into it a lot of time and expertise.
Thank you
--
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Re: Trying to run a sudo command from script
On Fri, Jan 1, 2010 at 5:08 PM, Diez B. Roggisch de...@nospam.web.de wrote:
Kent Tenney schrieb:
Howdy,
A script running as a regular user sometimes wants
to run sudo commands.
It gets the password with getpass.
pw = getpass.getpass()
I've fiddled a bunch with stuff like
proc = subprocess.Popen('sudo touch /etc/foo'.split(),
stdin=subprocess.PIPE)
proc.communicate(input=pw)
getting assorted errors with all variations I try.
Googling says use pexpect, but I'd prefer a stdlib solution.
pexpect is pure python, and it's needed. There is no easy way around the
issue, so if you insist on not using pexpect, you re-invent the wheel and
write the exact same code - just more error-prone, because of
wheel-reinvention
Indeed, the requirements of this are way more complex than I guessed.
The following seems to work well, took some fiddling with EOF.
def sudo(command, password=None, prompt=Enter password ):
import pexpect
if not password:
import getpass
password = getpass.getpass(prompt)
command = sudo + command
child = pexpect.spawn(command)
child.expect(['ssword', pexpect.EOF])
child.sendline(password)
child.expect(pexpect.EOF)
# is this necessary?
child.close()
Thanks,
Kent
Diez
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HAppy New Year
Hi guys, Jus want to wish you a happy new year to u all.. 1.Copy the content below and Paste it on a Notepad.2 . Use replace all (Ctrl + H)3. Type in ‘6’ in the ‘find what’ column 4. Type in _ (underscore) in the ‘replace with’ column 5. Click on replace all. 666 6669969966996666996996669966996666999966966 666996996699666699699999966666999969996 6669969966996699996996996699999966999999699 66699669669966996666966699996699996669966699666 6669969996996699666696669966999966999966966 666666999966996996669966999966999969996 6669996669996699666699699666996666999999699 6669969966996666996996669966666669966699666 666 666 666 66996996966666996699996996666996996 66996999996666699996999996666996996 669969966699699666999966999999669966666996699996996 6696699666996666666699699669966669966966996 66969666669999669969966669969996996 6699699999999666999999666669966 6699699666996996669999999999966669996669996 669969966996669966999999996996666996996 666 666 666 666996699666969996666699966 99996669996999999999966 69966999969969966699996699699966699999996669966 666669966699666996699696699999969669966 66699666969966699669699999966969966 6669966996699999699699699666999999966699966 666996666699699666996699666999999999966 6669966669966699669999666666666 66 Regards, Baboucarr. _ Windows Live: Friends get your Flickr, Yelp, and Digg updates when they e-mail you. http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/social-network-basics.aspx?ocid=PID23461::T:WLMTAGL:ON:WL:en-xm:SI_SB_3:092010-- http://mail.python.org/mailman/listinfo/python-list
Re: Dynamic text color
John Posner wrote
I've posted a complete solution
http://cl1p.net/jjp_dynamic_text_color/.
John
Thanks for posting your solution to Dave McCormick's query
about colorizing text
I was not familiar with the re.finditer method
for searching strings or with using tags in
Tkinter Text widgets to change text attributes
Instead of binding the Text widget to KeyRelease events
to call the colorizer on each key-stroke, I used a button
callback
http://cl1p.net/cs_static_text_color
This provides a static one-shot colorization after all
of the text is entered and should save a few cpu cycles
although it's not as nifty as the dynamic process
I used a dictionary instead of a list for position data
and also added a { term : color } dictionary so that
words other than color names can be hi-lighted
--
Stanley C. Kitching
Human Being
Phoenix, Arizona
--
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Re: Dangerous behavior of list(generator)
On Wed, 30 Dec 2009 23:20:06 -0500, Benjamin Kaplan wrote:
I used to have that a lot in cases where not finding at least one
valid foo is an actual fatal error.
What's wrong with the obvious solution?
if not any(foo for foo in foos if foo.bar):
raise ValueError('need at least one valid foo')
That would require 2 iterations through foos- once in the test, once for
the assignment if successful.
Remember though that any is a lazy test: it returns as soon as it gets a
result. In the case of an empty list, it returns immediately with False,
and in the case of a non-empty list, it returns immediately it reaches a
true item. It doesn't matter if there are twenty thousand items, it will
only look at the first so long as it is true.
Which of course answers my own question... what's wrong with using any is
that it fails if the objects are all considered false in a boolean
context, or if they might be. That means it will work for some objects
(e.g. the re module's MatchObject instances which are always true), but
not for arbitrary objects which may be false.
--
Steven
--
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Re: Bare Excepts
Why we should prefer ``if: ...'' over a ``try: ... except something: pass'' block? In http://wiki.python.org/moin/PythonSpeed/PerformanceTips#InitializingDictionaryElements it is stated that a try catch block is faster if more often no exception occurs. Happy new year, Dimitris Leventeas -- http://mail.python.org/mailman/listinfo/python-list
Re: a huge shared read-only data in parallel accesses -- How? multithreading? multiprocessing?
One thing I'm not clear on regarding Klauss' patch. He says it's applicable where the data is primarily non-numeric. In trying to understand why that would be the case, I'm thinking that the increased per-object memory overhead for reference-counting would outweigh the space gains from the shared memory. Klauss's test code stores a large number of dictionaries which each contain just 3 items. The stored items are strings, but short ones... it looks like they take up less space than double floats(?). So my understanding is that the point is that the overhead for the dictionaries is big enough that the patch is very helpful even though the stored items are small. And that the patch would be less and less effective as the number of items stored in each dictionary became greater and greater, until eventually the patch might do more use more space for reference counting than it saved by shared memory. Is this understanding correct? (I'm hoping not, because for some applications, I'd like to be able to use it for large dictionaries containing lots of numbers.) Thanks, Gary -- http://mail.python.org/mailman/listinfo/python-list
Re: Significant whitespace
On Jan 2, 10:29 am, Roy Smith r...@panix.com wrote: To address your question more directly, here's a couple of ways Fortran treated whitespace which would surprise the current crop of Java/PHP/Python/Ruby programmers: 1) Line numbers (i.e. the things you could GOTO to) were in column 2-7 (column 1 was reserved for a comment indicator). This is not quite significant whitespace, it's more like significant indentation. That would also surprise former FORTRAN programmers (who rarely referred to the language as Fortran). A comment was signified by a C in col 1. Otherwise cols 1-5 were used for statement labels (the things you could GOTO), col 6 for a statement continuation indicator, cols 7-72 for statement text, and cols 73-80 for card sequence numbers. -- http://mail.python.org/mailman/listinfo/python-list
Re: Significant whitespace
On Jan 1, 4:02�pm, Dan Stromberg drsali...@gmail.com wrote: I put together a page about significant whitespace (and the lack thereof). The real problem is your use of proportional spaced fonts. You're invited to check it out: http://stromberg.dnsalias.org/~dstromberg/significant-whitespace.html -- http://mail.python.org/mailman/listinfo/python-list
International Journal of Electronics, Information and Systems (IJEIS) Call for Paper
The International Journal of Electronics, Information and Systems (IJEIS) publish original papers on all subjects relevant to electronics, computer science, communication network, and information systems. The highest priority will be given to those contributions concerned with a discussion of the background of a practical problem, the establishment of an appropriate model, the determination of a solution, approximate or exact, analytical or numerical, and a discussion of the relevance of the results when applied to the real- life problem. Paper submissions are invited in the area of electronics and computer science, in particular the technological advances and research results in the fields of theoretical, experimental, and applied electronics, computer science and Information technology. Topics of interest include but are not limited to the following: Electronics: Analogue and digital circuit design, Microwave circuits and systems, Optoelectronic circuits, Semiconductor devices, Sensor technology, Transport in electronic materials, VLSI technology and device processing, Analogue Circuits and Signal Processing, Digital Circuits and Signal Processing, RF and Wireless Circuits Systems, Biomedical Circuits Systems, System Architectures and Applications, System Integration, SoC and Mixed-Signal disign, Design Automation of Electronics Systems, Assembly and Packaging, Sensing and Sensor Networks, Photonic and Optoelectronic Circuits, Test and Reliability, Neural Network Circuits Systems, Heterogeneous Structures, Advanced Technologies, Telecommunications and Multimedia, Electronic Materials, Electronic Devices, Integrated Electronic-Circuits, Optoelectronics Quantum Electronics, Biomedical Engineering, Electronics Applications, Sensing Systems, Communication and Networks, Electronic Commerce， All topics related Electronics Computer Science: Parallel Processing and Distributed Computing, Foundations of High- performance Computing, Graph Theory and Analysis of Algorithms, Artificial Intelligences and Pattern/Image Recognitions, Neural Networks and Biomedical Simulations, Virtual Visions and Virtual Simulations, Data Mining, Web Image Mining and Applications, Data Base Management and Information Retrievals Adaptive Systems, Bifurcation, Biocybernetics, Bioinformatics, Bio-Inspired Networks, Blind Systems, Cellular Neural Networks, Chaos, Chaos Neural Networks, Circuit Simulation, Circuit Theory, Communication Systems, Complex Systems, Control Systems, Cryptosystems, Data Compression, Data Mining, Detection, Echo Canceller, Estimation, Evolutional Computation, Filter, Filter Bank, Fractal, Fuzzy Systems, Image Processing, Image Recognition, Internet Security, Medical Applications, Modeling, Optimization, Speech Processing, Speech Synthesis, Speech Recognition, Synchronization, Video Signal Processing, Watermarking, Wavelet Transform, All topics related Computer Science Communication Network: Ad-Hoc, Mobile, Wireless Networks and Mobile Computing, Quantum Computing, Coding, and Error Controls Agent Computing and Multi-Agents Systems, Defining Spectrum Rights and Open Spectrum Solutions, Quality of Services and Communication Protocols, Satellite and Optical Communication Systems, 3G/4G Network Evolutions, CDMA/GSM Communication Protocols, Mobile Computing for e- Commerce,Transmission/Switching/Distribution technologies,Communication Theory,Signal Processing for Communications,Wireless Communications,Wireless Mobile Networking,Optical Networks and Systems,Next-Generation Networking and Internet,Communication QoS, Reliability and Modelling,Ad-hoc, Sensor and Mesh Networking,Multimedia Services, Communication Software and Services,Communication and Information System Security, System control, network/service management, Network and Internet protocols and standards,Client-server, distributed and Web-based communication systems, Broadband and multimedia systems and applications, Trials of advanced systems and services, Any topics related Communication Network Information and Systems: Cryptography and Foundation of Computer Security, Authentication/ Authorization Issues, IDS/Firewall, Anti-Spam mail, Anti-virus issues, Wireless Access Security, Network Security Applications, Biometric authentication and algorithms, Fingerprint /Hand/Biometrics Recognitions and Technologies, IC-card Security, OTP and Key Management Issues, E-commerce, Ubiquitous and RFID Applications, Metadata and Meta Modeling, XML and Data Management, Knowledge Management, Web Security and Privacy, Cyber Threats, Web Services and Web Engineering, Web Intelligence, Wireless Applications, Protocols and Standards, Network Systems, Proxies and Servers, Multimedia Applications using Web Services, Ontology and the Semantic Web, B2B, B2C and C2C, e-Business System Design and Development, e-Payment, Portal Strategies, Social Networks and Information Systems, Social and Legal Issues, Digital Ecology, e-Governance, e-Learning and Virtual
Re: detect interactivity
On 12/30/2009 11:25 PM, Roald de Vries wrote: Actually, performance is not much if an issue for what I want to do; it's mainly interest in 'how should I do this in general'. I'll just leave in all the code, and if it becomes a real issue, I'll separate the code over an interactive and a non-interactive script. Thanks for your inputs. XP summarizes it as: You ain't gonna need it (http://en.wikipedia.org/wiki/You_ain%27t_gonna_need_it ) -- http://mail.python.org/mailman/listinfo/python-list
Re: Safe file I/O to shared file (or SQLite) from multi-threaded web server
John Nagle wrote: pyt...@bdurham.com wrote: I'm looking for the best practice way for a multi-threaded python web server application to read/write to a shared file or a SQLite database. What do I need to do (if anything) to make sure my writes to a regular file on disk or to a SQLite database are atomic in nature when multiple clients post data to my application simultaneously? SQLite can do that correctly, but SQLite isn't intended for use as a database engine for a busy database being used by many concurrent operations. Especially if those operations involve updates. Any update in SQLite locks all tables involved for the duration of the operation. When SQLite hits a lock, it returns an error code, and the caller should retry after a delay. If this occurs frequently in your application, you've hit the limits of SQLite. Then it's time to move up to MySQL. Or PostgreSQL, which has superior SQL standards conformance and excellent high-volume data performance. If you have enough traffic that you need a multi-threaded web server, it's probably time to move up. Yes, but not to MySQL, please. Particularly since there is a sword of Damocles hanging over its head while the Oracle takeover of Sun is pending. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the best data structure for a very simple spreadsheet?
On 1/3/2010 10:27 PM, vsoler wrote: 1) what are, in your opinion, the basic elements of the Cell class? The user-entered formula and effective value. A Cell containing a formula abc has a value of abc; a cell containing the formula =1+5 has a value of 6. You could use the 'property' decorator for the effective value attribute. 2) Do I need a parser to evaluate the formulas like “3*A1+A2”? Can you recommend one library that already contains one? Yes you do. PyParsing, regex, write your own parser; choose your own poison depending on the expected complexity of the formulaes. 3) Do I need a tree data structure to represent my data? There are two main options for your primary data structure: - table (2x2 list) -- if you expect most of your cells to be filled, this is simple, but uses lots of memory - sparse table (list/dicts of cells) -- if you have a large table that is mostly empty cells The Dependency Tree is the side data structure; a Cell is a Node; a Cell's dependencies is the Node's children; a Cell's dependant is the Node's parent. Cells maintains a list of dependencies (or dynamically generates them when requested) by analyzing the formula attribute for references to other cells. PS: Strictly speaking, this side data structure is not a Tree as there are multiple root nodes. I think it's called Directed Acyclic Graph. However, it's true that, given a cell as a root, the cell's dependencies is a proper tree. would the tree be an attribute of the class instance? you could use 'property' decorator and make the dependency tree a computed attribute of the cell; many people recommended against a 'property' that is heavy to compute though and calculating dependencies may be quite heavy depending on the complexity of the spreadsheet. I imagine a lot can be said on these questions. What I am looking for is some hints that help me get out of where I am now. Any help is highly appreciated. Vicente Soler -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the best data structure for a very simple spreadsheet?
On Jan 3, 2:58 pm, Lie Ryan lie.1...@gmail.com wrote: On 1/3/2010 10:27 PM, vsoler wrote: 1) what are, in your opinion, the basic elements of the Cell class? The user-entered formula and effective value. A Cell containing a formula abc has a value of abc; a cell containing the formula =1+5 has a value of 6. You could use the 'property' decorator for the effective value attribute. 2) Do I need a parser to evaluate the formulas like 3*A1+A2 ? Can you recommend one library that already contains one? Yes you do. PyParsing, regex, write your own parser; choose your own poison depending on the expected complexity of the formulaes. 3) Do I need a tree data structure to represent my data? There are two main options for your primary data structure: - table (2x2 list) -- if you expect most of your cells to be filled, this is simple, but uses lots of memory - sparse table (list/dicts of cells) -- if you have a large table that is mostly empty cells The Dependency Tree is the side data structure; a Cell is a Node; a Cell's dependencies is the Node's children; a Cell's dependant is the Node's parent. Cells maintains a list of dependencies (or dynamically generates them when requested) by analyzing the formula attribute for references to other cells. PS: Strictly speaking, this side data structure is not a Tree as there are multiple root nodes. I think it's called Directed Acyclic Graph. However, it's true that, given a cell as a root, the cell's dependencies is a proper tree. would the tree be an attribute of the class instance? you could use 'property' decorator and make the dependency tree a computed attribute of the cell; many people recommended against a 'property' that is heavy to compute though and calculating dependencies may be quite heavy depending on the complexity of the spreadsheet. I imagine a lot can be said on these questions. What I am looking for is some hints that help me get out of where I am now. Any help is highly appreciated. Vicente Soler As well as what Steven Lie have mentioned, maybe you could get inspiration from http://pyspread.sourceforge.net/ Although I've not looked at it, my gut feeling is the author would've had to address these issues (take that as a disclaimer of some sort :) ) From not having to had a need for this sort of thing, I'd probably go for a sparse representation as a graph. But again, depends why you're segmenting the spreadsheet from need to tell dependencies. Jon. -- http://mail.python.org/mailman/listinfo/python-list
Re: Any Swisses here?
On Sat, Jan 2, 2010 at 10:38 PM, n00m n...@narod.ru wrote: On Jan 3, 5:30 am, Steve Holden st...@holdenweb.com wrote: Zhu Sha Zang wrote: [stuff and nonsense from a third party] WTF? We do get the occasional bigot dropping in from time to time. Best to ignore them 'til they go away. And who are YOU? What you achieved in the life? For me you is nothing I recall only Kipling, Dickens, Newton its your background. My backgroung is the best rockets Don't be so dismissive Steve. What we have here is clearly a struggling young AI trying to extrapolate the average content of an alt.group to the comp.lang community. The fact that it passed the gmail spam filters is a sign of progress. So hello new friend, and your backgroung is the best rockets! -Jack -- http://mail.python.org/mailman/listinfo/python-list
Re: twenty years ago Guido created Python
On Thu, Dec 31, 2009 at 05:06:24PM EST, Steve Howell wrote: FYI: http://twitter.com/gvanrossum Python is a truly awesome programming language. Not only is Guido a genius language designer, but he is also a great project leader. What an accomplishment. Congratulations to everybody who has contributed to Python in the last two decades! Interesting to note that Guido's achievements prompt much less response, and get much less coverage, than Xah Lee's :-) I guess Guido's not one to care much about beauty contests anyway. HNY, CJ -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the best data structure for a very simple spreadsheet?
vsoler wrote: Hi, Not sure this is the best group to post, but I cannot think of any other. My application would contain a limited set of cells represented by the instances of a Cell class: class Cell: ... A1=Cell(7) A2=Cell(2*A1) A3=Cell(3*A1+A2) A4=Cell(A3*4) Of course, A1 = 7, A2 = 14, A3 = 35 and A4 = 140 Now, I somehow want to be able to show a dependency tree 1 level dependency trees A1: None A2: A1 A3: A1, A2 A4: A3 All levels dependency trees A1: None A2: A1 A3: A1, A2 A4: A3, A2, A1 Leaf + values dependency trees: A1: 7 A2: A1=7, 2 A3: 3, A1=7, 2 A4: 3, A1=7, 2, 4 What I'd like to know is: 1) what are, in your opinion, the basic elements of the Cell class? 2) Do I need a parser to evaluate the formulas like “3*A1+A2”? Can you recommend one library that already contains one? 3) Do I need a tree data structure to represent my data? would the tree be an attribute of the class instance? I imagine a lot can be said on these questions. What I am looking for is some hints that help me get out of where I am now. Any help is highly appreciated. As well as considering the other replies, you don't necessarily need to parse the expressions yourself. If A1 is a cell then 2*A1 tries to call the __rmul__ method of A1 (and A1*2 tries to call the __mul__ method of A1), so you could have it return a formula object that will multiply and return the numeric value of self (A1) by 2 when its own numeric value is requested. This means that a cell could be initialised with either a number or a formula. -- http://mail.python.org/mailman/listinfo/python-list
Re: HAppy New Year
2010/1/2 baboucarr sanneh sanne...@hotmail.com: Hi guys, Jus want to wish you a happy new year to u all.. 1.Copy the content below and Paste it on a Notepad. 2 . Use replace all (Ctrl + H) 3. Type in ‘6’ in the ‘find what’ column 4. Type in _ (underscore) in the ‘replace with’ column 5. Click on replace all. Wow, I just love Windows users. Sending this to the Python list? Paste on a notepad?!? The Replace All function in a notepad is Ctrl-H?!?? What does H stand for?!?!? Explicit instructions how to :%s/6/_/g in a notepad?!?!? Happy new year! -- Dotan Cohen http://what-is-what.com http://gibberish.co.il -- http://mail.python.org/mailman/listinfo/python-list
Re: HAppy New Year
Dotan Cohen wrote: 2010/1/2 baboucarr sanneh sanne...@hotmail.com: Hi guys, Jus want to wish you a happy new year to u all.. 1.Copy the content below and Paste it on a Notepad. 2 . Use replace all (Ctrl + H) 3. Type in ‘6’ in the ‘find what’ column 4. Type in _ (underscore) in the ‘replace with’ column 5. Click on replace all. Wow, I just love Windows users. Sending this to the Python list? Paste on a notepad?!? The Replace All function in a notepad is Ctrl-H?!?? What does H stand for?!?!? Explicit instructions how to :%s/6/_/g in a notepad?!?!? Happy new year! What I want to know is why didn't he just write \ ... original long string ... .replace(6, _) But watch that snarkiness ... I'm a Windows user too! regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: HAppy New Year
What I want to know is why didn't he just write \ ... original long string ... .replace(6, _) Uf! Why didn't I think of that?! But watch that snarkiness ... I'm a Windows user too! That's fine, I know that fresh air has to get into the basement somehow ! -- Dotan Cohen http://what-is-what.com http://gibberish.co.il -- http://mail.python.org/mailman/listinfo/python-list
[gtk+thread] Why worker thread never wakes from time.sleep()?
Hello!
I have simple gui gtk app. It has worker thread that populates list
with strings and gtk window with main loop which pops strings
from this list and shows them in TreeView.
Thread runs get_data_from_pcap to populate list with strings.
Gtk app calls update_store() with gobject.timeout_add every second.
If I comment time.sleep() in update_store(),
worker thread never wakes up after his time.sleep().
Why?
Here's runnable example:
#!/usr/bin/python
# -*- coding: utf-8 -*-
import pygtk
pygtk.require('2.0')
import gtk
import gobject
import pcap
import sys
import threading
import time
CONSOLE_ENCODING = 'utf-8'
if sys.platform == 'win32':
CONSOLE_ENCODING = 'cp866'
global_pcap_queue = []
global_pcap_lock = threading.Lock()
global_pcap_stop_event = threading.Event()
class CityGame:
def __init__(self):
window = gtk.Window(gtk.WINDOW_TOPLEVEL)
window.connect('delete_event', self.delete_event)
window.connect('destroy', self.destroy)
store = gtk.ListStore(gobject.TYPE_STRING)
view = gtk.TreeView(store)
#name
col = gtk.TreeViewColumn('Data')
cell = gtk.CellRendererText()
view.append_column(col)
col.pack_start(cell, True)
col.add_attribute(cell, 'text', 0)
vb = gtk.VBox()
vb.pack_start(view)
window.add(vb)
window.set_size_request(400, 300)
window.show_all()
self.__store = store
def main(self):
gobject.timeout_add(1000, self.update_store)
gtk.main()
def update_store(self):
data = None
global_pcap_lock.acquire()
if len(global_pcap_queue):
data = global_pcap_queue.pop(0)
print 'Update'
global_pcap_lock.release()
time.sleep(0.01)
if data:
self.__store.append([data])
return True
def delete_event(self, widget, event, data = None):
dlg = gtk.MessageDialog(flags = gtk.DIALOG_MODAL, type =
gtk.MESSAGE_QUESTION,
buttons = gtk.BUTTONS_YES_NO,
message_format = 'Are you sure you want to quit?')
dlg.set_title('CityGame')
result = dlg.run()
dlg.destroy()
return (result != gtk.RESPONSE_YES)
def destroy(self, widget, data = None):
gtk.main_quit()
def main(args):
cg = CityGame()
cg.main()
def get_data_from_pcap():
#while True:
while not global_pcap_stop_event.isSet():
global_pcap_lock.acquire()
global_pcap_queue.append(str(time.time()))
print 'Thread'
global_pcap_lock.release()
time.sleep(0.01)
return
if __name__ == '__main__':
global_pcap_stop_event.clear()
pcap_thread = threading.Thread(target = get_data_from_pcap)
pcap_thread.start()
main(sys.argv[1:])
global_pcap_stop_event.set()
pcap_thread.join()
--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
--
http://mail.python.org/mailman/listinfo/python-list
Re: twenty years ago Guido created Python
Chris Jones cjns1...@gmail.com writes: Interesting to note that Guido's achievements prompt much less response, and get much less coverage […] The entirety of ‘comp.lang.python’ is an ongoing response to Guido van Rossum's achievements (and all the others that make Python great). Mere week- or month-long threads are paltry by comparison. -- \“If this is your first visit to the USSR, you are welcome to | `\ it.” —hotel room, Moscow | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: HAppy New Year
On Sun, 3 Jan 2010 21:18:38 +0200 Dotan Cohen dotanco...@gmail.com wrote: Wow, I just love Windows users. Sending this to the Python list? Paste I was going to ask him if his mommy and daddy knew that he was playing with the grown-ups' computer. -- D'Arcy J.M. Cain da...@druid.net | Democracy is three wolves http://www.druid.net/darcy/| and a sheep voting on +1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner. -- http://mail.python.org/mailman/listinfo/python-list
Re: What is the best data structure for a very simple spreadsheet?
Perhaps this can be useful: http://www.web2py.com/examples/spreadsheet The code is in a single file with not dependencies and it does not require web2py to run: http://code.google.com/p/web2py/source/browse/gluon/contrib/spreadsheet.py Here is a sample controller that shows you how to embed the spreadsheet in web page: http://code.google.com/p/web2py/source/browse/applications/examples/controllers/spreadsheet.py Massimo On Jan 3, 5:27 am, vsoler vicente.so...@gmail.com wrote: Hi, Not sure this is the best group to post, but I cannot think of any other. My application would contain a limited set of cells represented by the instances of a Cell class: class Cell: ... A1=Cell(7) A2=Cell(2*A1) A3=Cell(3*A1+A2) A4=Cell(A3*4) Of course, A1 = 7, A2 = 14, A3 = 35 and A4 = 140 Now, I somehow want to be able to show a dependency tree 1 level dependency trees A1: None A2: A1 A3: A1, A2 A4: A3 All levels dependency trees A1: None A2: A1 A3: A1, A2 A4: A3, A2, A1 Leaf + values dependency trees: A1: 7 A2: A1=7, 2 A3: 3, A1=7, 2 A4: 3, A1=7, 2, 4 What I'd like to know is: 1) what are, in your opinion, the basic elements of the Cell class? 2) Do I need a parser to evaluate the formulas like “3*A1+A2”? Can you recommend one library that already contains one? 3) Do I need a tree data structure to represent my data? would the tree be an attribute of the class instance? I imagine a lot can be said on these questions. What I am looking for is some hints that help me get out of where I am now. Any help is highly appreciated. Vicente Soler -- http://mail.python.org/mailman/listinfo/python-list
Re: Exception as the primary error handling mechanism?
On Jan 1, 2:47 pm, Peng Yu pengyu...@gmail.com wrote:
In the article API Design Matters by Michi Henning
Communications of the ACM
Vol. 52 No. 5, Pages 46-56
10.1145/1506409.1506424http://cacm.acm.org/magazines/2009/5/24646-api-design-matters/fulltext
It says Another popular design flaw—namely, throwing exceptions for
expected outcomes—also causes inefficiencies because catching and
handling exceptions is almost always slower than testing a return
value.
My observation is contradicted to the above statement by Henning. If
my observation is wrong, please just ignore my question below.
Seeing that quite a few people have put their own interpretation on
what I wrote, I figured I'll post a clarification.
The quoted sentence appears in a section of the article that deals
with efficiency. I point out in that section that bad APIs often have
a price not just in terms of usability and defect rate, but that they
are often inefficient as well. (For example, wrapper APIs often
require additional memory allocations and/or data copies.) Incorrect
use of exceptions also incurs an efficiency penalty.
In many language implementations, exception handling is expensive;
significantly more expensive than testing a return value. Consider the
following:
int x;
try {
x = func();
} catch (SomeException) {
doSomething();
return;
}
doSomethingElse();
Here is the alternative without exceptions. (func() returns
SpecialValue instead of throwing.)
int x;
x = func();
if (x == SpecialValue) {
doSomething();
return;
}
doSomethingElse();
In many language implementations, the second version is considerably
faster, especially when the exception may be thrown from deep in the
bowels of func(), possibly many frames down the call tree.
If func() throws an exception for something that routinely occurs in
the normal use of the API, the extra cost can be noticeable. Note that
I am not advocating not to use exceptions. I *am* advocating to not
throw exceptions for conditions that are not exceptional.
The classic example of this are lookup functions that, for example,
retrieve the value of an environment variable, do a table lookup, or
similar. Many such APIs throw an exception when the lookup fails
because the key isn't the table. However, very often, looking for
something that isn't there is a common case, such as when looking for
a value and, if the value isn't present already, adding it. Here is an
example of this:
KeyType k = ...;
ValueType v;
try {
v = collection.lookup(k);
} catch (NotFoundException) {
collection.add(k, defaultValue);
v = defaultValue;
}
doSomethingWithValue(v);
The same code if collection doesn't throw when I look up something
that isn't there:
KeyType k = ...;
ValueType v;
v = collection.lookup(k);
if (v == null) {
collection.add(k, defaultValue);
v = defaultValue;
}
doSomethingWithValue(v);
The problem is that, if I do something like this in a loop, and the
loop is performance-critical, the exception version can cause a
significant penalty.
As the API designer, when I make the choice between returning a
special value to indicate some condition, or throwing an exception, I
should consider the following questions:
* Is the special condition such that, under most conceivable
circumstances, the caller will treat the condition as an unexpected
error?
* Is it appropriate to force the caller to deal with the condition in
a catch-handler?
* If the caller fails to explicitly deal with the condition, is it
appropriate to terminate the program?
Only if the answer to these questions is yes is it appropriate to
throw an exception. Note the third question, which is often forgotten.
By throwing an exception, I not only force the caller to handle the
exception with a catch-handler (as opposed to leaving the choice to
the caller), I also force the caller to *always* handle the exception:
if the caller wants to ignore the condition, he/she still has to write
a catch-handler and failure to do so terminates the program.
Apart from the potential performance penalty, throwing exceptions for
expected outcomes is bad also because it forces a try-catch block on
the caller. One example of this is the .NET socket API: if I do non-
blocking I/O on a socket, I get an exception if no data is ready for
reading (which is the common and expected case), and I get a zero
return value if the connection was lost (which is the uncommon and
unexpected case).
In other words, the .NET API gets this completely the wrong way round.
Code that needs to do non-blocking reads from a socket turns into a
proper mess as a result because the outcome of a read() call is tri-
state:
* Data was available and returned: no exception
* No data available: exception
* Connection lost: no exception
Because such code normally lives in a loop that decrements a byte
count until the expected number of bytes have been read, the control
flow because really awkward because the successful case must be dealt
Re: IOError - cannot create file (linux daemon-invoked script)
On Jan 2, 3:46 pm, Steve Holden st...@holdenweb.com wrote: cassiope wrote: I have a daemon on a Linux system that supports a number of Windows clients. Among the functions is to send e-mails, which is sufficiently complicated that I fork() a separate process which gets setuid to a lesser user, and calls a python script which does the actual formatting and emailing (the daemon is written in C). I want to save a copy of the email in a particular directory which is accessible to the Windows clients via samba. The strange thing is that even with the right user-id, I cannot seem to write to the directory, getting an IOError exception. Changing the directory to world-writable fixes this. I can confirm the uid and gid for the script by having the script print these values just before trying to create/write the file. Becoming the same lesser user, I have no problem writing a file to the same directory. Have you looked at the IOError's errno attribute to find out exactly why the Python subprocess is unable to write to the directory? It's errno=13 ... permission denied. Is there anything that I can do to diagnose why this script is failing? For various reasons I don't want to make the directory world- writable. I'd concur on that decision. This is on a Debian squeeze system, with python 2.5. Thanks for any insights! Take a closer look at the exception, that might stimulate a thought or two. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS: http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: IOError - cannot create file (linux daemon-invoked script)
On Jan 2, 6:40 pm, Christian Heimes li...@cheimes.de wrote: cassiope wrote: The strange thing is that even with the right user-id, I cannot seem to write to the directory, getting an IOError exception. Changing the directory to world-writable fixes this. I can confirm the uid and gid for the script by having the script print these values just before trying to create/write the file. Becoming the same lesser user, I have no problem writing a file to the same directory. Are you able to write to the directory with the user id when you tried to create a file manually? Yes. Sorry that wasn't clear. How are you changing the uid and gid of your script? IIRC you have to set the effective user id with os.seteuid() and os.setegid(). I'm changing the uid and gid in the daemon (which runs with root permissions until the fork and uid/gid change). The uid and gid are confirmed by printing os.getuid() and os.getgid() in the script. Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Set variables based on dictionary
Joan Miller wrote:
How to set local variables based on dictionary contents?
def f(**d):
... for k, v in d.iteritems(): exec %s = v % k
... return locals()
...
f(a=42, b=yadda)
{'a': 42, 'k': 'b', 'b': 'yadda', 'd': {'a': 42, 'b': 'yadda'}, 'v':
'yadda'}
f(**{print 'warning: this can execute arbitrary code'; a:42})
warning: this can execute arbitrary code
{'a': 42, 'k': print 'warning: this can execute arbitrary code'; a, 'd':
{print 'warning: this can execute arbitrary code'; a: 42}, 'v': 42}
Peter
--
http://mail.python.org/mailman/listinfo/python-list
Re: IOError - cannot create file (linux daemon-invoked script)
cassiope wrote: On Jan 2, 6:40 pm, Christian Heimes li...@cheimes.de wrote: cassiope wrote: The strange thing is that even with the right user-id, I cannot seem to write to the directory, getting an IOError exception. Changing the directory to world-writable fixes this. I can confirm the uid and gid for the script by having the script print these values just before trying to create/write the file. Becoming the same lesser user, I have no problem writing a file to the same directory. Are you able to write to the directory with the user id when you tried to create a file manually? Yes. Sorry that wasn't clear. How are you changing the uid and gid of your script? IIRC you have to set the effective user id with os.seteuid() and os.setegid(). I'm changing the uid and gid in the daemon (which runs with root permissions until the fork and uid/gid change). The uid and gid are confirmed by printing os.getuid() and os.getgid() in the script. And what do os.geteuid() and os.getegid() report? I suppose it's possible there's some bizarre difference between the effective and actual process parameters. IS the filestore a local file system, or an NFS mount? regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: twenty years ago Guido created Python
On Sun, Jan 03, 2010 at 04:19:02PM EST, Ben Finney wrote: Chris Jones cjns1...@gmail.com writes: Interesting to note that Guido's achievements prompt much less response, and get much less coverage […] The entirety of ‘comp.lang.python’ is an ongoing response to Guido van Rossum's achievements (and all the others that make Python great). Mere week- or month-long threads are paltry by comparison. That I understand. But my remark was not really about Guido.. but rather in a roundabout way, more of a poke at Xah Lee, hopefully avoiding the troll-feeding trap. Sorry you missed my point. Come to think of it, since I have nothing much to say about python, but nevertheless enjoy reading most of the material on this list, this was mostly an excuse to wish everyone here a Happy New Year. CJ -- http://mail.python.org/mailman/listinfo/python-list
Re: IOError - cannot create file (linux daemon-invoked script)
On Jan 2, 8:02 pm, Cameron Simpson c...@zip.com.au wrote: On 02Jan2010 15:21, cassiope f...@u.washington.edu wrote: | [...] I want | to save a copy of the email in a particular directory which is | accessible to the Windows clients via samba. | | The strange thing is that even with the right user-id, I cannot seem | to write to the directory, getting an IOError exception. Changing the | directory to world-writable fixes this. I can confirm the uid and gid | for the script by having the script print these values just before | trying to create/write the file. Becoming the same lesser user, I | have no problem writing a file to the same directory. Can you show us: - the directory user and group ownership and permissions - the daemon's user and group values? Directory permissions: 774 Directory ownership: lesser user, special group where /etc/group has special group members including the lesser user, as well as those who are expected to use the daemon, but not root. Script ownership: lesser user; permissions 755 Daemon ownership: root; permissions: 755 (always started by root). The script also has to connect to a postgresql database for part of its work - that part works, You can also strace your daemon: strace -f -e trace=file your-daemon your-daemon-args... 2strace.out and then examine the log for the precise UNIX-level failure. Cheers, -- Cameron Simpson c...@zip.com.au DoD#743http://www.cskk.ezoshosting.com/cs/ Money won't buy happiness, but it will pay the salary of a large research staff to study the problem. - Bill Vaughan Thanks, Cameron (and Steve and Christian). My first shot with strace (it's been awhile since I've used that - I think your syntax may be a tiny bit off - but it's probably the tool I need to use. Will explore further... -- http://mail.python.org/mailman/listinfo/python-list
Re: IOError - cannot create file (linux daemon-invoked script)
On 03Jan2010 14:20, cassiope f...@u.washington.edu wrote: | On Jan 2, 8:02 pm, Cameron Simpson c...@zip.com.au wrote: | Can you show us: | - the directory user and group ownership and permissions | - the daemon's user and group values? | | Directory permissions: 774 That's unusual - why the 4? Directories with read but no search (1) are of limited use. (Not none - it's only unusual, not insane). | Directory ownership: lesser user, special group where /etc/group | has special group members including the lesser user, as well as | those who are expected to use the daemon, but not root. | Script ownership: lesser user; permissions 755 | Daemon ownership: root; permissions: 755 (always started by root). And the script/daemon _runs_ as the lesser user? If so, superficially the permissions look like they should work. -- Cameron Simpson c...@zip.com.au DoD#743 http://www.cskk.ezoshosting.com/cs/ I couldn't think of anything else to do with it, so I put it on the web. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exception as the primary error handling mechanism?
Michi wrote:
On Jan 1, 2:47 pm, Peng Yu pengyu...@gmail.com wrote:
In the article API Design Matters by Michi Henning
Communications of the ACM
Vol. 52 No. 5, Pages 46-56
10.1145/1506409.1506424http://cacm.acm.org/magazines/2009/5/24646-api-design-matters/fulltext
It says Another popular design flaw—namely, throwing exceptions for
expected outcomes—also causes inefficiencies because catching and
handling exceptions is almost always slower than testing a return
value.
My observation is contradicted to the above statement by Henning. If
my observation is wrong, please just ignore my question below.
Seeing that quite a few people have put their own interpretation on
what I wrote, I figured I'll post a clarification.
The quoted sentence appears in a section of the article that deals
with efficiency. I point out in that section that bad APIs often have
a price not just in terms of usability and defect rate, but that they
are often inefficient as well. (For example, wrapper APIs often
require additional memory allocations and/or data copies.) Incorrect
use of exceptions also incurs an efficiency penalty.
In many language implementations, exception handling is expensive;
significantly more expensive than testing a return value. Consider the
following:
int x;
try {
x = func();
} catch (SomeException) {
doSomething();
return;
}
doSomethingElse();
Here is the alternative without exceptions. (func() returns
SpecialValue instead of throwing.)
int x;
x = func();
if (x == SpecialValue) {
doSomething();
return;
}
doSomethingElse();
In many language implementations, the second version is considerably
faster, especially when the exception may be thrown from deep in the
bowels of func(), possibly many frames down the call tree.
If func() throws an exception for something that routinely occurs in
the normal use of the API, the extra cost can be noticeable. Note that
I am not advocating not to use exceptions. I *am* advocating to not
throw exceptions for conditions that are not exceptional.
The classic example of this are lookup functions that, for example,
retrieve the value of an environment variable, do a table lookup, or
similar. Many such APIs throw an exception when the lookup fails
because the key isn't the table. However, very often, looking for
something that isn't there is a common case, such as when looking for
a value and, if the value isn't present already, adding it. Here is an
example of this:
KeyType k = ...;
ValueType v;
try {
v = collection.lookup(k);
} catch (NotFoundException) {
collection.add(k, defaultValue);
v = defaultValue;
}
doSomethingWithValue(v);
The same code if collection doesn't throw when I look up something
that isn't there:
KeyType k = ...;
ValueType v;
v = collection.lookup(k);
if (v == null) {
collection.add(k, defaultValue);
v = defaultValue;
}
doSomethingWithValue(v);
The problem is that, if I do something like this in a loop, and the
loop is performance-critical, the exception version can cause a
significant penalty.
In Python, of course, there's a method for this: setdefault.
As the API designer, when I make the choice between returning a
special value to indicate some condition, or throwing an exception, I
should consider the following questions:
* Is the special condition such that, under most conceivable
circumstances, the caller will treat the condition as an unexpected
error?
* Is it appropriate to force the caller to deal with the condition in
a catch-handler?
* If the caller fails to explicitly deal with the condition, is it
appropriate to terminate the program?
Only if the answer to these questions is yes is it appropriate to
throw an exception. Note the third question, which is often forgotten.
By throwing an exception, I not only force the caller to handle the
exception with a catch-handler (as opposed to leaving the choice to
the caller), I also force the caller to *always* handle the exception:
if the caller wants to ignore the condition, he/she still has to write
a catch-handler and failure to do so terminates the program.
Apart from the potential performance penalty, throwing exceptions for
expected outcomes is bad also because it forces a try-catch block on
the caller. One example of this is the .NET socket API: if I do non-
blocking I/O on a socket, I get an exception if no data is ready for
reading (which is the common and expected case), and I get a zero
return value if the connection was lost (which is the uncommon and
unexpected case).
In other words, the .NET API gets this completely the wrong way round.
Code that needs to do non-blocking reads from a socket turns into a
proper mess as a result because the outcome of a read() call is tri-
state:
* Data was available and returned: no exception
* No data available: exception
* Connection lost: no exception
Because such code normally lives in a loop that decrements a byte
count until the expected number of bytes have been read, the control
Re: IOError - cannot create file (linux daemon-invoked script)
On Jan 3, 3:00 pm, Cameron Simpson c...@zip.com.au wrote: On 03Jan2010 14:20, cassiope f...@u.washington.edu wrote: | On Jan 2, 8:02 pm, Cameron Simpson c...@zip.com.au wrote: | Can you show us: | - the directory user and group ownership and permissions | - the daemon's user and group values? | | Directory permissions: 774 That's unusual - why the 4? Directories with read but no search (1) are of limited use. (Not none - it's only unusual, not insane). | Directory ownership: lesser user, special group where /etc/group | has special group members including the lesser user, as well as | those who are expected to use the daemon, but not root. | Script ownership: lesser user; permissions 755 | Daemon ownership: root; permissions: 755 (always started by root). And the script/daemon _runs_ as the lesser user? If so, superficially the permissions look like they should work. -- Cameron Simpson c...@zip.com.au DoD#743http://www.cskk.ezoshosting.com/cs/ I couldn't think of anything else to do with it, so I put it on the web. Strace confirms the uid and gid == lesser user. Changing the directory permissions to 775 changes nothing. Clearly get EACCES error on the attempted file creation. The only other thing is that as part of the python interpreter call, I provide a reduced environment, just UID,GID,TMP,PWD,USER, and HOME. Is anything else needed? Thanks again, Cameron! -- http://mail.python.org/mailman/listinfo/python-list
Re: IOError - cannot create file (linux daemon-invoked script)
On 03Jan2010 15:56, cassiope f...@u.washington.edu wrote: | Strace confirms the uid and gid == lesser user. Changing the | directory | permissions to 775 changes nothing. Clearly get EACCES error on the | attempted | file creation. | | The only other thing is that as part of the python interpreter call, I | provide | a reduced environment, just UID,GID,TMP,PWD,USER, and HOME. Is | anything | else needed? Should be irrelevant. Ok: does the file to be created already exist? If so, what are its permissions? If the file exists and isn't writable you may get this error. Also, did you eyeball the actual open() call to ensure the file pathname is correct, and doesn't use a bogus (non-existent) directory name? -- Cameron Simpson c...@zip.com.au DoD#743 http://www.cskk.ezoshosting.com/cs/ GOD IS MY SOURCE - Bumper sticker, Chapel Hill, NC I'll have to remember that one for the next code review meeting. - ajvan...@ingr.com (Alain van der Heide) -- http://mail.python.org/mailman/listinfo/python-list
Re: Significant whitespace
Roy Smith r...@panix.com wrote: 2) Whitespace was not required in many places. For example, the following two statements (this will only make sense in a fixed-width font) are identical: DO 10 I = 1, 10 DO10I=1,10 More than not required, it was not relevant. This led to one of the most infamous programming blunders in the early days of the space program, when one programmer accidentially typed a period instead of a comma resulting in the loss of a satellite: DO 10 I = 1. 10 What this actually does is store the floating point value 1.1 in a new variable called DO10I. -- Tim Roberts, t...@probo.com Providenza Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: DST and datetime
In message 874on82oan@benfinney.id.au, Ben Finney wrote: Or you could use the ready-made wheel maintained by others: tzinfo Objects URL:http://docs.python.org/library/datetime.html#tzinfo-objects But that’s only an abstract base class, which means it doesn’t actually implement any reading of actual timezone info. World timezone definitions, modern and historical URL:http://pypi.python.org/pypi/pytz Shame that they maintain their own duplicate of the Olson database, instead of reading the original directly from /usr/share/zoneinfo http://www.codecodex.com/wiki/Reading_time_zone_files. -- http://mail.python.org/mailman/listinfo/python-list
Re: Safe file I/O to shared file (or SQLite) from multi-threaded web server
In message mailman.367.1262529266.28905.python-l...@python.org, Steve Holden wrote: Yes, but not to MySQL, please. Particularly since there is a sword of Damocles hanging over its head while the Oracle takeover of Sun is pending. Ah, I see the FUDsters are crawling out of the woodwork here, as well. I’ve got news for you: MySQL is an open-source product. And you can’t kill Open Source. So go crawling back to your proprietary world, if that’s the only world you understand. -- http://mail.python.org/mailman/listinfo/python-list
Re: Safe file I/O to shared file (or SQLite) from multi-threaded web server
Lawrence D'Oliveiro wrote: In message mailman.367.1262529266.28905.python-l...@python.org, Steve Holden wrote: Yes, but not to MySQL, please. Particularly since there is a sword of Damocles hanging over its head while the Oracle takeover of Sun is pending. Ah, I see the FUDsters are crawling out of the woodwork here, as well. I’ve got news for you: MySQL is an open-source product. And you can’t kill Open Source. So go crawling back to your proprietary world, if that’s the only world you understand. I have no objection to you attempting to inform me about things I already understand, but I would appreciate at least some attempt on your part to maintain civility in your discourse. There is no need to be so obnoxious, or so ill-informed: I didn't get to chair the Python Software Foundation by crawling [around in a] proprietary world, so kindly mind your manners. MySQL has always been technically inferior to other choices of open source database. The current state of affairs was entirely predictable, and appears to be more to do with Monty Widenius' wish to continue exploiting a brand that he sold toSun two years ago than it has to do with technical issues, as I pointed out yesterday. http://holdenweb.blogspot.com/2010/01/wht-save-mysql-now.html regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
python xmlrpc client with ssl client certificates and standard modules
Hi,
I was googling fot quite some time and was not really succesfull.
I found one solution, which I will try soon.
It is
http://www.cs.technion.ac.il/~danken/xmlrpc-ssl.html
(found in
http://hamakor.org.il/pipermail/python-il/2008-February/29.html )
This will probably work, but it requires the module M2Crypto.
In order to avoid installing M2Crypto an all hosts that want to run the
script I wondered, whether there is no other solution.
I can do xmlrpc over ssl WITHOUT certificates with following code:
import xmlrpclib
server_url = 'https://myserver'
server = xmlrpclib.Server(server_url);
and I can perform a https get request WITH certificates with below snippet:
import httplib
conn = httplib.HTTPSConnection(
HOSTNAME,
key_file = KEYFILE,
cert_file = CERTFILE
)
conn.putrequest('GET', '/')
conn.endheaders()
response = conn.getresponse()
print response.read()
I'm just lost of how to 'combine' both.
Thanks in advance for any suggestions / hints
N
--
http://mail.python.org/mailman/listinfo/python-list
Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?
*#How to use setup.py file with py2exe:*
**
python daniesetup.py py2exe --bundle 1
*#Also the data files have to taken care off in the options* list
*#Here is a sample setup.py:*
*#*
from distutils.core import setup
import py2exe
import sys
# no arguments
if len(sys.argv) == 1:
sys.argv.append(py2exe)
# creates a standalone .exe file, no zip files
setup( options = {py2exe: {compressed: 1, optimize: 2, ascii: 1,
bundle_files: 1}},
zipfile = None,
# replace test.py with your own code filename here ...
console = [{script: 'test.py'}] )
Regards
Prakash
--
http://mail.python.org/mailman/listinfo/python-list
Re: Significant whitespace
In article eqf2k5pna25hb0v7a30p9dpcmsvt46s...@4ax.com, Tim Roberts t...@probo.com wrote: Roy Smith r...@panix.com wrote: 2) Whitespace was not required in many places. For example, the following two statements (this will only make sense in a fixed-width font) are identical: DO 10 I = 1, 10 DO10I=1,10 More than not required, it was not relevant. This led to one of the most infamous programming blunders in the early days of the space program, when one programmer accidentially typed a period instead of a comma resulting in the loss of a satellite: DO 10 I = 1. 10 What this actually does is store the floating point value 1.1 in a new variable called DO10I. 1.1 or 1.01? There were some places where a blank was equivalent to a zero in a number. I don't remember if this was one of them. -- http://mail.python.org/mailman/listinfo/python-list
Re: twenty years ago Guido created Python
i'm sobered up Yes of course Guido and his lang is both superb things -- http://mail.python.org/mailman/listinfo/python-list
Re: twenty years ago Guido created Python
Chris Jones cjns1...@gmail.com writes: On Sun, Jan 03, 2010 at 04:19:02PM EST, Ben Finney wrote: The entirety of ‘comp.lang.python’ is an ongoing response to Guido van Rossum's achievements (and all the others that make Python great). Mere week- or month-long threads are paltry by comparison. That I understand. But my remark was not really about Guido.. but rather in a roundabout way, more of a poke at [a troll], hopefully avoiding the troll-feeding trap. You didn't avoid it, since you irrelevantly raised (twice, now) discussion of a troll in a thread originally unrelated to that person. Sorry you missed my point. I didn't, since I attempted to bring it back on topic by expunging the off-topic part of your message. Sorry I failed to salvage the thread. -- \ “If sharing a thing in no way diminishes it, it is not rightly | `\ owned if it is not shared.” —Augustine of Hippo (354–430 CE) | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Any Swisses here?
What Imeant by what waht try to solve e.g. http://acm.sgu.ru/problem.php?contest=0problem=482 99% people here are 0 in this. They know this they know that, but they can't nothing, they simply are sitting on this group and apraised themselves But you can nothing -- http://mail.python.org/mailman/listinfo/python-list
Re: Significant whitespace
On Sun, Jan 3, 2010 at 8:09 PM, Tim Roberts t...@probo.com wrote: More than not required, it was not relevant. This led to one of the most infamous programming blunders in the early days of the space program, when one programmer accidentially typed a period instead of a comma resulting in the loss of a satellite: Interesting story. Did you make it up? -- http://mail.python.org/mailman/listinfo/python-list
Re: Exception as the primary error handling mechanism?
On Sun, 03 Jan 2010 13:44:29 -0800, Michi wrote:
The quoted sentence appears in a section of the article that deals with
efficiency. I point out in that section that bad APIs often have a price
not just in terms of usability and defect rate, but that they are often
inefficient as well.
This is very true, but good APIs often trade-off increased usability and
reduced defect rate against machine efficiency too. In fact, I would
argue that this is a general design principle of programming languages:
since correctness and programmer productivity are almost always more
important than machine efficiency, the long-term trend across virtually
all languages is to increase correctness and productivity even if doing
so costs some extra CPU cycles.
(For example, wrapper APIs often require additional
memory allocations and/or data copies.) Incorrect use of exceptions also
incurs an efficiency penalty.
And? *Correct* use of exceptions also incur a penalty. So does the use of
functions. Does this imply that putting code in functions is a poor API?
Certainly not.
In many language implementations, exception handling is expensive;
significantly more expensive than testing a return value.
And in some it is less expensive.
But no matter how much more expensive, there will always be a cut-off
point where it is cheaper on average to suffer the cost of handling an
exception than it is to make unnecessary tests.
In Python, for dictionary key access, that cut-off is approximately at
one failure per ten or twenty attempts. So unless you expect more than
one in ten attempts to lead to a failure, testing first is actually a
pessimation, not an optimization.
Consider the following:
int x;
try {
x = func();
} catch (SomeException) {
doSomething();
return;
}
doSomethingElse();
Here is the alternative without exceptions. (func() returns SpecialValue
instead of throwing.)
int x;
x = func();
if (x == SpecialValue) {
doSomething();
return;
}
doSomethingElse();
In some, limited, cases you might be able to use the magic return value
strategy, but this invariably leads to lost programmer productivity, more
complex code, lowered readability and usability, and more defects,
because programmers will invariably neglect to test for the special value:
int x;
x = func();
doSomething(x);
return;
Or worse, they will write doSomething() so that it too needs to know
about SpecialValue, and so do all the functions it calls. Instead of
dealing with the failure in one place, you can end up having to deal with
it in a dozen places.
But even worse is common case that SpecialValue is a legal value when
passed to doSomething, and you end up with the error propagating deep
into the application before being found. Or even worse, it is never found
at all, and the application simply does the wrong thing.
In many language implementations, the second version is considerably
faster, especially when the exception may be thrown from deep in the
bowels of func(), possibly many frames down the call tree.
This is a classic example of premature optimization. Unless such
inefficiency can be demonstrated to actually matter, then you do nobody
any favours by preferring the API that leads to more defects on the basis
of *assumed* efficiency.
If your test for a special value is 100 times faster than handling the
exception, and exceptions occur only one time in 1000, then using a
strategy of testing for a special value is actually ten times slower on
average than catching an exception.
If func() throws an exception for something that routinely occurs in the
normal use of the API, the extra cost can be noticeable.
Can be. But it also might not be noticeable at all.
[...]
Here is an example of this:
KeyType k = ...;
ValueType v;
try {
v = collection.lookup(k);
} catch (NotFoundException) {
collection.add(k, defaultValue);
v = defaultValue;
}
doSomethingWithValue(v);
The same code if collection doesn't throw when I look up something that
isn't there:
KeyType k = ...;
ValueType v;
v = collection.lookup(k);
if (v == null) {
collection.add(k, defaultValue);
v = defaultValue;
}
doSomethingWithValue(v);
The problem is that, if I do something like this in a loop, and the loop
is performance-critical, the exception version can cause a significant
penalty.
No, the real problems are:
(1) The caller has to remember to check the return result for the magic
value. Failure to do so leads to bugs, in some cases, serious and hard-to-
find bugs.
(2) If missing keys are rare enough, the cost of all those unnecessary
tests will out-weigh the saving of avoiding catching the exception. Rare
enough may still be very common: in the case of Python, the cross-over
point is approximately 1 time in 15.
(3) Your collection now cannot use the magic value as a legitimate value.
This last one can be *very* problematic. In the early
Re: Exception as the primary error handling mechanism?
In article pan.2010.01.04.03.30...@remove.this.cybersource.com.au, Steven D'Aprano ste...@remove.this.cybersource.com.au wrote: This last one can be *very* problematic. In the early 1990s, I was programming using a callback API that could only return an integer. The standard way of indicating an error was to return -1. But what happens if -1 is a legitimate return value, e.g. for a maths function? One of the truly nice features of Python is the universally distinguished value, None. -- http://mail.python.org/mailman/listinfo/python-list
Re: Significant whitespace
In article mailman.386.1262576043.28905.python-l...@python.org, David Robinow drobi...@gmail.com wrote: On Sun, Jan 3, 2010 at 8:09 PM, Tim Roberts t...@probo.com wrote: More than not required, it was not relevant. This led to one of the most infamous programming blunders in the early days of the space program, when one programmer accidentially typed a period instead of a comma resulting in the loss of a satellite: Interesting story. Did you make it up? It's a fairly well known story. http://catless.ncl.ac.uk/Risks/5.64.html#subj4.2 -- http://mail.python.org/mailman/listinfo/python-list
Re: Significant whitespace
On Sun, Jan 3, 2010 at 10:42 PM, Roy Smith r...@panix.com wrote: In article mailman.386.1262576043.28905.python-l...@python.org, David Robinow drobi...@gmail.com wrote: On Sun, Jan 3, 2010 at 8:09 PM, Tim Roberts t...@probo.com wrote: More than not required, it was not relevant. This led to one of the most infamous programming blunders in the early days of the space program, when one programmer accidentially typed a period instead of a comma resulting in the loss of a satellite: Interesting story. Did you make it up? It's a fairly well known story. http://catless.ncl.ac.uk/Risks/5.64.html#subj4.2 Sure. But the question is, Who made it up? http://en.wikiquote.org/wiki/Fortran Computer folklore has incorrectly attributed the loss of the Mariner 1 space probe to a syntax error in a Fortran program. For example, Recall the first American space probe to Venus, reportedly lost because Fortran cannot recognize a missing comma in a DO statement…[ -- http://mail.python.org/mailman/listinfo/python-list
Re: twenty years ago Guido created Python
Now tell me: what ahat this mobs of yellow, africans, asiats, are doing in Stockholm? Do you think your govs let me in just to vist England, Norway? Never. Its all conditionally. But the fact is. IS. You roll our world into abyss of stupidity -- http://mail.python.org/mailman/listinfo/python-list
Question about an application
I am thinking of installing a python webserver I coded in every computer at my work. This would allow me to run specific tasks in them, like creating backups, installing things, etc. Is there another way to run programs in remote computers? Thanks for your opinions. -- View this message in context: http://old.nabble.com/Question-about-an-application-tp27009118p27009118.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list
Re: Question about an application
Take a look at ssh Sent from my iPhone 3GS. On Jan 4, 2010, at 12:50 AM, rieh25 robertoedw...@gmail.com wrote: I am thinking of installing a python webserver I coded in every computer at my work. This would allow me to run specific tasks in them, like creating backups, installing things, etc. Is there another way to run programs in remote computers? Thanks for your opinions. -- View this message in context: http://old.nabble.com/Question-about-an-application-tp27009118p27009118.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: twenty years ago Guido created Python
n00m wrote: Ok, let me evolve a bit my thought. Guido is Eropean Culture. Now say what was invented by Japanese, by Chinese? Nothing. Barbaric cultures, they are animals inborn animals. Russian Sikorsky built choppers for Eisenhower. Look at letter S on them -- its his name What you know about his destiny? You know knothing. Yuou don't know that only the greatest Russian composer Rakhmaninov helped him, in America. Literally -- by money, the composer gave him all his fortune ~$1500 Be not this help -- no choppers in America Announcement: You can download the latest version of this cutting edge bot from here... http://www.illiteratexenophobicrantingracistsimulator.ru/usenet_spambot.py Plugins available here... http://www.illiteratexenophobicrantingracistsimulator.ru/terrible_spelling.py http://www.illiteratexenophobicrantingracistsimulator.ru/inconsequential_facts.py http://www.illiteratexenophobicrantingracistsimulator.ru/rabid_nationalism.py Happy new year everybody! Roger. -- http://mail.python.org/mailman/listinfo/python-list
Re: Question about an application
Thanks, I had forgotten about it. I'll investigate if there are ways to automate using it to run programs in several computers at the same time. Rodrick Brown wrote: Take a look at ssh Sent from my iPhone 3GS. On Jan 4, 2010, at 12:50 AM, rieh25 robertoedw...@gmail.com wrote: I am thinking of installing a python webserver I coded in every computer at my work. This would allow me to run specific tasks in them, like creating backups, installing things, etc. Is there another way to run programs in remote computers? Thanks for your opinions. -- View this message in context: http://old.nabble.com/Question-about-an-application-tp27009118p27009118.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- View this message in context: http://old.nabble.com/Question-about-an-application-tp27009118p27009252.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list
Re: twenty years ago Guido created Python
On Sun, Jan 03, 2010 at 10:18:18PM EST, Ben Finney wrote: Chris Jones cjns1...@gmail.com writes: [..] Sorry you missed my point. I didn't, since I attempted to bring it back on topic by expunging the off-topic part of your message. Er.. what's 'off-topic' about mentioning that a couple of trolls on this list often seem to attract far more interest than a genuine testimonial to Guido's achievement? Sorry I failed to salvage the thread. Man with a Mission, hehe.. CJ -- http://mail.python.org/mailman/listinfo/python-list
Re: Significant whitespace
David Robinow wrote: On Sun, Jan 3, 2010 at 10:42 PM, Roy Smith r...@panix.com wrote: In article mailman.386.1262576043.28905.python-l...@python.org, David Robinow drobi...@gmail.com wrote: On Sun, Jan 3, 2010 at 8:09 PM, Tim Roberts t...@probo.com wrote: More than not required, it was not relevant. This led to one of the most infamous programming blunders in the early days of the space program, when one programmer accidentially typed a period instead of a comma resulting in the loss of a satellite: Interesting story. Did you make it up? It's a fairly well known story. http://catless.ncl.ac.uk/Risks/5.64.html#subj4.2 Sure. But the question is, Who made it up? http://en.wikiquote.org/wiki/Fortran Computer folklore has incorrectly attributed the loss of the Mariner 1 space probe to a syntax error in a Fortran program. For example, Recall the first American space probe to Venus, reportedly lost because Fortran cannot recognize a missing comma in a DO statement…[ Wow you're totally right! It was a missing UNDERSCORE not a DOT being typed instead of a COMMA! We've been lied to ALL ALONG! What kind of sickos would do this? Let's find this Tim character, flay him alive and then go crown you the KING OF EVERYTHING for rescuing us from that deadly nugget of misinformation! Honestly I might have believed those dot/comma LIES if it wasn't for your noble selfless efforts to uncover the SHOCKING TRUTH. Imagine what might have happened! The character in question being an UNDERSCORE COMPLETELY CHANGES the meaning and point of the story. As for it being LEFT OUT rather than TRANSPOSED, well, anyone can see how that TURNS THE WHOLE STORY UPSIDE DOWN. Of course there are the naysayers who might claim absolute accuracy is no big deal in stories that are essentially parables but they do not understand the HARM that can come from not remembering really tiny, almost inconsequential details. For what it's worth I DO NOT consider you a tiresome pedant and I think your taunting, patronising style is completely appropriate and proportional to Tim's sickening crimes against fact. Roger. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exception as the primary error handling mechanism?
On Sun, 03 Jan 2010 22:36:44 -0500, Roy Smith wrote:
In article pan.2010.01.04.03.30...@remove.this.cybersource.com.au,
Steven D'Aprano ste...@remove.this.cybersource.com.au wrote:
This last one can be *very* problematic. In the early 1990s, I was
programming using a callback API that could only return an integer. The
standard way of indicating an error was to return -1. But what happens
if -1 is a legitimate return value, e.g. for a maths function?
One of the truly nice features of Python is the universally
distinguished value, None.
What happens if you need to return None as a legitimate value?
Here's a good example: iterating over a list. Python generates an
exception when you hit the end of the list. If instead, Python returned
None when the index is out of bounds, you couldn't store None in a list
without breaking code.
So we produce a special sentinel object EndOfSequence. Now we can't do
this:
for obj in [, 12, None, EndOfSequence, [], {}]:
print dir(obj) # or some other useful operation
The fundamental flaw of using magic values is that, there will always be
some application where you want to use the magic value as a non-special
value, and then you're screwed.
This is why, for instance, it's difficult for C strings to contain a null
byte, and there are problems with text files on DOS and CP/M (and Windows
under some circumstances) that contain a ^Z byte.
--
Steven
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Re: Significant whitespace
On Sun, 03 Jan 2010 23:42:44 -0500, David Robinow wrote: On Sun, Jan 3, 2010 at 10:42 PM, Roy Smith r...@panix.com wrote: In article mailman.386.1262576043.28905.python-l...@python.org, David Robinow drobi...@gmail.com wrote: On Sun, Jan 3, 2010 at 8:09 PM, Tim Roberts t...@probo.com wrote: More than not required, it was not relevant. This led to one of the most infamous programming blunders in the early days of the space program, when one programmer accidentially typed a period instead of a comma resulting in the loss of a satellite: Interesting story. Did you make it up? It's a fairly well known story. http://catless.ncl.ac.uk/Risks/5.64.html#subj4.2 Sure. But the question is, Who made it up? http://en.wikiquote.org/wiki/Fortran Computer folklore has incorrectly attributed the loss of the Mariner 1 space probe to a syntax error in a Fortran program. For example, Recall the first American space probe to Venus, reportedly lost because Fortran cannot recognize a missing comma in a DO statement…[ What makes you believe it is incorrect? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Question about an application
rieh25 wrote: Thanks, I had forgotten about it. I'll investigate if there are ways to automate using it to run programs in several computers at the same time. Rodrick Brown wrote: Take a look at ssh There are. Take a look at paramiko if you want to interface with SSH within python. Depending on what you need to do it may well be easier to use bash scripts / batch files or simply the CLI instead e.g. ssh account_n...@192.168.x.x 'ls /' root_folder_listing.txt This line... starts ssh logs into account on machine 192.168.x.x executes ls pipes the data back to a file on your local machine Easy peasy :) Roger. -- http://mail.python.org/mailman/listinfo/python-list
python mechanize proxy support question
Hello All
Happy New Year!
i have some question about python mechanize 's proxy support.
im making some web client script, and i would like to insert proxy support
function into my script.
for example ,if i have such like following some script.
how can i add proxy support into my mechanize script?
i was look for some reference , but not so much good hint from google.
params = urllib.urlencode({'id':id, 'passwd':pw})
rq = mechanize.Request(http://www.example.com; params)
rs = mechanize.urlopen(rq)
whenever i open this 'www.example.com' website , i would like open go
through proxy.
Thanks in advance!
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TypeError: can only concatenate list (not tuple) to list
This py [1,2,3] + (4,5) Traceback (most recent call last): File stdin, line 1, in module TypeError: can only concatenate list (not tuple) to list -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
[issue7618] optparse library documentation has an insignificant formatting issue
Ezio Melotti ezio.melo...@gmail.com added the comment: Fixed in r77267 (trunk), r77268 (release26-maint), r77269 (py3k), r77270 (release31-maint), thanks! -- priority: - normal resolution: - fixed stage: - committed/rejected status: open - closed versions: +Python 2.6, Python 2.7, Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7618 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7532] Extended slicing with classic class behaves strangely
Mark Dickinson dicki...@gmail.com added the comment: Closing as won't fix. -- resolution: - wont fix status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7532 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7610] Cannot use both read and readline method in same ZipExtFile object
Nir Aides n...@winpdb.org added the comment: I uploaded a possible patch for Python 2.7. The patch converts ZipExtFile into subclass of io.BufferedIOBase and drops most of the original implementation. However, the patch breaks current newline behavior of ZipExtFile. I figured this was reasonable because zipfile newline behavior: a) was introduced in Python 2.6 b) was incompatible with behavior of io module files. c) was not documented. Reading zip content as text with newline functionality may be done with io.TextIOWrapper. A bonus of sub classing io.BufferedIOBase is significantly better read performance. -- keywords: +patch Added file: http://bugs.python.org/file15723/zipfile_7610_py27.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7610 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3754] minimal cross-compilation support for configure
Changes by Roumen Petrov bugtr...@roumenpetrov.info: -- versions: +Python 2.7 Added file: http://bugs.python.org/file15724/python-trunk-20100103-CROSS.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3754 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3871] cross and native build of python for mingw32 with distutils
Changes by Roumen Petrov bugtr...@roumenpetrov.info: Added file: http://bugs.python.org/file15725/python-trunk-20100103-MINGW.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3871 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue4294] Macros for PyLong: sign, number of digits, fits in an int
Mark Dickinson dicki...@gmail.com added the comment: Closing this. I like the PyLong_IS_NEGATIVE and PyLong_IS_ZERO macros, but I can't find anywhere outside longobject.c where they'd actually be useful (with the possible exception of marshal.c, but that currently depends on knowing lots about the long implementation anyway). And I don't really see much benefit from doing a mass replacement of uses of 'Py_SIZE(a) 0', etc. in Objects/longobject.c; I think it's the code is readable enough as it stands. -- resolution: - rejected status: open - pending ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4294 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3366] Add gamma function, error functions and other C99 math.h functions to math module
Mark Dickinson dicki...@gmail.com added the comment: Will close this unless there's an outcry of support for exp2 and log2. nirinA, if you're still interested in adding the euler constant, please open another issue. -- status: open - pending ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3366 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1755841] Patch for [ 735515 ] urllib2 should cache 301 redir
Antoine Pitrou pit...@free.fr added the comment: Here is the corrected patch for caching the 301 redirections. * It caches only the redirection not the response. * It retains cacheable=True kwarg for http_error_301 method. ( I feel, it should be useful) * Have made the cached dict as private. I'm still not sure what this patch is trying to do. It seems you are using the cached URL *after* getting the 301 response. But the whole point of caching redirections is to avoid emitting the initial request at all. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1755841 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3972] Add Option to Bind to a Local IP Address in httplib.py
Antoine Pitrou pit...@free.fr added the comment:
It seems to break at least one buildbot:
==
ERROR: testSourceAddress (test.test_socket.NetworkConnectionAttributesTest)
--
Traceback (most recent call last):
File
/var/lib/buildslave/trunk.murray-gentoo-wide/build/Lib/test/test_socket.py,
line 120, in _tearDown
self.fail(msg)
AssertionError: Tuples differ: ('199.125.120.107', 40732) != ('127.0.0.1',
40732)
First differing element 0:
199.125.120.107
127.0.0.1
- ('199.125.120.107', 40732)
+ ('127.0.0.1', 40732)
--
Ran 100 tests in 11.505s
By the way, does the new source_address parameter have to be of the
same family as the target address? That is, if I pass e.g. 127.0.0.1
as source address, what happens if the target host resolves to an IPv6
address?
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[issue7607] stringlib fastsearch could be improved on 64-bit builds
Changes by Giampaolo Rodola' billiej...@users.sourceforge.net: -- nosy: +giampaolo.rodola ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7607 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7607] stringlib fastsearch could be improved on 64-bit builds
Florent Xicluna la...@yahoo.fr added the comment: Another place where this optimization will apply: Objects/unicodeobject.c for the bloom filters: #define BLOOM(mask, ch) ((mask (1 ((ch) 0x1F -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7607 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3451] Asymptotically faster divmod and str(long)
Changes by Mark Dickinson dicki...@gmail.com: -- versions: -Python 3.1 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3451 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7585] [patch] difflib should separate filename from timestamp with tab
Antoine Pitrou pit...@free.fr added the comment: Is there any reason why you changed some of the examples in the docstrings (e.g. 'Sat Jan 26 23:30:50 1991' - '1991-01-26 23:30:50')? -- nosy: +pitrou ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7585 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7585] [patch] difflib should separate filename from timestamp with tab
Changes by Antoine Pitrou pit...@free.fr: -- nosy: +tim_one priority: - normal stage: - patch review versions: -Python 2.6, Python 3.1 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7585 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7610] Cannot use both read and readline method in same ZipExtFile object
Antoine Pitrou pit...@free.fr added the comment: I don't think we can remove the U option from 2.6/2.7; it was certainly introduced for a reason and isn't inconsistent with the U option to the built-in open(). On 3.x, behaviour is indeed inconsistent with the standard IO library, so maybe we can either wrap the object in a TextIOWrapper, or remove support for U. -- nosy: +pitrou priority: - normal stage: - patch review versions: +Python 3.2 -Python 2.6 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7610 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7585] [patch] difflib should separate filename from timestamp with tab
anatoly techtonik techto...@gmail.com added the comment: It is the same reason as for removing recommendation from docstring to generate timestamps in the format returned by time.ctime(). See issue #7582 -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7585 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3972] Add Option to Bind to a Local IP Address in httplib.py
R. David Murray rdmur...@bitdance.com added the comment: Ah, and I was even the one that suggested the bind to 127.0.0.1 strategy for the test :( My buildbots run in linux-vserver virtual hosts, and they way they handle localhost (127.0.0.1) is to alias it to the IP address assigned to the virthost (otherwise multiple virthosts opening ports on 127.0.0.1 would potentially conflict with each other). I'd consider this a bug in the virthost software (lack of feature?). Not sure what the best workaround is, but if all else fails we could put in some special case skip code. Would be good enough to have the test check that the returned IP address is *not* 0.0.0.0? Or perhaps issue a warning if the address is not 0.0.0.0 but isn't 127.0.0.1. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3972 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7622] [patch] improve unicode methods: split() rsplit() and replace()
New submission from Florent Xicluna la...@yahoo.fr: Content of the patch: - removed code duplication between bytearray/string/unicode - new header stringlib/split.h with common methods: stringlib_split/_rsplit/_splitlines - added maxcount argument to stringlib_count - better performance for split/replace unicode methods Benchmark coming soon... -- components: Interpreter Core files: stringlib_split_replace.diff keywords: patch messages: 97168 nosy: flox severity: normal status: open title: [patch] improve unicode methods: split() rsplit() and replace() type: performance versions: Python 2.7 Added file: http://bugs.python.org/file15726/stringlib_split_replace.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7622 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7623] PropertyType missing in Lib/types.py
New submission from Winfried Plappert winfried.plapp...@gmail.com: I wonder why there is not PropertyType defined in Lib/types.py. I found it out the hard way when I was xref'ing my Python files and the program died missing a key type 'property'. It can easily be defined as PropertyType = type(property()). See also Issue1327971 where PropertyType gets defined locally and the matching diff file, http://bugs.python.org/file13036/test_pyclbr_property.diff. -- components: Library (Lib) messages: 97169 nosy: wplappert severity: normal status: open title: PropertyType missing in Lib/types.py type: behavior versions: Python 2.6, Python 2.7, Python 3.1 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7623 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7623] PropertyType missing in Lib/types.py
Benjamin Peterson benja...@python.org added the comment: We are not adding new types to types.py. See #1605 -- nosy: +benjamin.peterson resolution: - rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7623 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1545] shutil fails when copying to NTFS in Linux
Valentín valentin.depa...@gmail.com added the comment: I think this one is solved now. I recommend just to put as solved and kill it from the list ;) -- nosy: +Val ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1545 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7622] [patch] improve unicode methods: split() rsplit() and replace()
Antoine Pitrou pit...@free.fr added the comment: The split.h file is missing from your patch. -- nosy: +pitrou ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7622 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7622] [patch] improve unicode methods: split() rsplit() and replace()
Changes by Florent Xicluna la...@yahoo.fr: Removed file: http://bugs.python.org/file15726/stringlib_split_replace.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7622 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7622] [patch] improve unicode methods: split() rsplit() and replace()
Florent Xicluna la...@yahoo.fr added the comment: You're right. Oups. -- Added file: http://bugs.python.org/file15727/stringlib_split_replace_v2.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7622 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7622] [patch] improve unicode methods: split() rsplit() and replace()
Antoine Pitrou pit...@free.fr added the comment: The patch looks wrong for bytearrays. They are mutable, so you shouldn't return the original object as an optimization. Here is the current (unpatched) behaviour: a = bytearray(babc) b, = a.split() b is a False On the other hand, you aren't doing this optimization at all in the general case of stringlib_split() and stringlib_rsplit(), while it could be done. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7622 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1545] shutil fails when copying to NTFS in Linux
Changes by Benjamin Peterson benja...@python.org: -- resolution: - fixed status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1545 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7624] isinstance(... , collections.Callable) fails with oldstyle class i nstances
New submission from Roger Gammans rgamm...@computer-surgery.co.uk: The following sequence causes isinstance to raise an exception rather than to return False. class foo: ... pass ... import collections isinstance(foo,collections.Callable) True isinstance(foo(),collections.Callable) Traceback (most recent call last): File stdin, line 1, in module File /usr/lib/python2.6/abc.py, line 131, in __instancecheck__ return (cls.__subclasscheck__(subclass) or File /usr/lib/python2.6/abc.py, line 147, in __subclasscheck__ ok = cls.__subclasshook__(subclass) File /usr/lib/python2.6/_abcoll.py, line 117, in __subclasshook__ if any(__call__ in B.__dict__ for B in C.__mro__): AttributeError: class foo has no attribute '__mro__' -- components: Library (Lib) messages: 97175 nosy: rgammans severity: normal status: open title: isinstance(... ,collections.Callable) fails with oldstyle class i nstances versions: Python 2.6 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7624 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7625] bytearray needs more tests for b.some_method()[0] is not b
New submission from Florent Xicluna la...@yahoo.fr:
There's not enough tests to verify such cases:
- b.split()[0] is not b
- b.rsplit()[0] is not b
- b.splitlines()[0] is not b
- b.partition('.')[0] is not b
- b.rpartition('.')[0] is not b
- (other ?)
However similar tests exist in Lib/test/test_bytes:
* ByteArrayTest.test_copied()
- some tests for ('replace', 'translate')
* ByteArrayTest.test_partition_bytearray_doesnt_share_nullstring
- some tests for ('partition', 'rpartition')
* BytearrayPEP3137Test.test_returns_new_copy()
- some tests for ('zfill', 'rjust', 'ljust', 'center')
--
components: Tests
messages: 97176
nosy: flox
priority: low
severity: normal
stage: needs patch
status: open
title: bytearray needs more tests for b.some_method()[0] is not b
versions: Python 2.7
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[issue7625] bytearray needs more tests for b.some_method()[0] is not b
Florent Xicluna la...@yahoo.fr added the comment:
And each test comes with a new bug :)
x = bytearray('abc')
x.partition('.')[0] is x
True
x.rpartition('.')[2] is x
True
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[issue7625] bytearray needs more tests for b.some_method()[0] is not b
Changes by Florent Xicluna la...@yahoo.fr: -- components: +Interpreter Core versions: +Python 2.6, Python 3.1, Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7625 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7626] Entity references without semicolon in HTMLParser
New submission from Stefan Schweizer steve.schwei...@gmail.com: HTMLParser should only handle entity references that are terminated with a semicolon. I know that the semicolon can be omitted in some cases (http://www.w3.org/TR/html4/charset.html#h-5.3) and that some browsers are more tolerant, but the following example causes some odd output: import HTMLParser class EntityrefParser(HTMLParser.HTMLParser): ... def handle_data(self, data): ... print handle_data '%s' % data ... def handle_entityref(self, name): ... print handle_entityref '%s' % name ... p = EntityrefParser() p.feed(pspameggs are delicious/p) Expected Result: handle_data 'spameggs are delicious' Actual Result: handle_data 'spam' handle_entityref 'eggs' handle_data ' are delicious' -- components: Library (Lib) messages: 97177 nosy: stefan.schweizer severity: normal status: open title: Entity references without semicolon in HTMLParser type: behavior versions: Python 2.6 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7626 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3972] Add Option to Bind to a Local IP Address in httplib.py
Gregory P. Smith g...@krypto.org added the comment: I took the easy route and remove the test of the hostname all together. The fact that the source port was used is sufficient indication that the bind call was made. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3972 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
