🌐 Mailman 3 February 2005 - Python-list - python.org

Save the Canvas!
by sean_mcilroy＠yahoo.com Feb. 2, 2005

Feb. 2, 2005

I'd like to be able to save a Tkinter Canvas in a format other than postscript (preferably gif). Is there a tool out there for accomplishing that? Any help will be much appreciated. Peace, STM

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Re: Next step after pychecker
by Philippe Fremy Feb. 2, 2005

Feb. 2, 2005

> I do not want to discourage Philippe Fremy but I think that this would be very > very difficult to do without modifying Python itself. That's the conclusion I reached to too after lurking on the ocaml list. > > What FP languages rely upon to achieve type inference is a feature named > "strong typing". > [...] > > This is certainly not the case for Python since one and the same variable can > have different types depending upon the execution context. Example : > > 1- if a is None: > 2- b = 1 > 3- else: > 4- b = "Phew" > 5- b = b + 1 > > One cannot statically determine the type of b by examining the line 5- alone. > There are even worse cases: 1- a=1 2- a= someObject.someMethod() someObject might not have someMethod() and this would be caught by an AttributeError exception handler and 'a' will stay at 1. > Therefore, Fremy's dream can very well turn to some very complex expert system > to make "educated" warning. Being "educated" is a lot harder than to be > "brutal". And even being brutal is not that easy to achieve... > Anyway, strong typing as defined above would change the Python language in > some of its fundamental design. It would certainly be valuable to attempt the > experience, and rename the new language (mangoose would be a pretty name). Indeed. I understood that this is one of the things that could be provided by pypy. What I understood (Jacek, this is an answer for you too) is that there are many usage patterns for python. Some people use it for all of its advanced dynamic features. I use it in a java-like fashion. One could use it without the "OO crap", like a modern pascal replacement. This is a strength of python that it lends itself to so many programming paradigm. However, one drawback is that python is not optimum in many of these paradigm (although it is sometimes the best proponent). In my case, dynamic typing is not a required feature. Typing immutability and type inferring is a lot more valuable. I really hope that pypy will provide that kind of choice. Give me python with eiffel like contracts, super speed optimisation thank to type inference and I will be super happy. Thank everyone for its feedback. Any other idea of a fun python improvement project I could join without too much hassle ? I can't help but thinking that pychecker ought to be able to do a better job. regards, Philippe > > Francis Girard > FRANCE > > Le mardi 1 Février 2005 16:49, Diez B. Roggisch a écrit : > >>>But it can be useful to restrict type variety in certain situations >>>e.g. prime number calculation :) And it would probably also be useful >>>to check violations of restrictions before running the program in >>>normal mode. >> >>But that's what (oca)ml and the like do - they exactly don't force you to >>specify a type, but a variable has an also variable type, that gets >>inferned upon the usage and is then fixed. >> >>-- >>Regards, >> >>Diez B. Roggisch > >

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RE: Python checkin driver version on windows
by Tim Golden Feb. 2, 2005

Feb. 2, 2005

[Chris Jameyson] | Is there a way to check driver version information on windows through | Python? | | I'd like to pull driver version, digital sig from the same place that | 'device manager' gets it's information. It's possible that WMI can do it, although device etc. aren't my area, so I'm not sure what to look for. If you can find what you want in here: http://groups-beta.google.com/group/microsoft.public.win32.programmer.wmi (or anywhere else), I'm happy to help you to translate it to Python WMI. TJG ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

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How do you do arrays
by tbunce＠mac.com Feb. 2, 2005

Feb. 2, 2005

I am new at Pyton and I am learning from book not classes so please forgive my being slow The below does not work I get an Error of File "Matrix[index] = k NameError: name 'iMatrix' is not defined" while index < majorlop1: index = index + 1 k = random.choice(listvalues) + 1 iMatrix[index] = k The book statement of array(typecode, initializer) does not make sence to me how it henerates ore relaes to the org name for the array. Thank You Tom

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how to separate hexadecimal
by jrlen balane Feb. 2, 2005

Feb. 2, 2005

i have a 4 digit hex number (2 bytes) and i want to separate it into 2 digit hex (1 byte each) meaning i want to get the upper byte and the lower byte since i am going to add this two. how am i going to do this? should i treat it just like a normal string? please help, thanks. ex. hexa = '0x87BE" # what i want to do is: a = 0x87, b = 0xBE # so that i could do this: c = a + b #which should be equal to 0x145

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Who should security issues be reported to?
by grahamd＠dscpl.com.au Feb. 2, 2005

Feb. 2, 2005

Who are the appropriate people to report security problems to in respect of a module included with the Python distribution? I don't feel it appropriate to be reporting it on general mailing lists.

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Re: Next step after pychecker
by Steven Bethard Feb. 2, 2005

Feb. 2, 2005

Terry Reedy wrote: > Nothing about bytecode is part of the language spec. And CPython > bytecode is version specific. If the CPython implementation changed > from a virtual stack machine to a virtual register machine, as was > once discussed, the stack-oriented byte code would be replaced by a > register-oriented byte code or virtual machine language. Thanks for the clarification. I knew the byte-code changed from version to version, but of course so does the language, so that didn't tell me much. ;) So I assume the language spec is basically the grammar and the Language Reference docs[1]? Or is there something more formal? Steve [1] e.g. http://docs.python.org/ref/ref.html

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Re: how to separate hexadecimal
by Paul Rubin Feb. 2, 2005

Feb. 2, 2005

jrlen balane <nbbalane(a)gmail.com> writes: > ex. hexa = '0x87BE" # what i want to do is: > a = 0x87, b = 0xBE # so that i could do this: > c = a + b #which should be equal to 0x145 Assuming you really want hexa to begin with the characters '0x', the string slicing way is: a, b = hexa[2:4], hexa[4:6] # a = '87', b = 'BE' c = int(a,16) + int(b, 16) A more direct arithmetic way is: x = int(hexa, 16) # x = the integer 0x87be c = (x >> 8) + (x & 0xff)

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mixing SWIG generated and Python-level usertype?
by Bo Peng Feb. 2, 2005

Feb. 2, 2005

Dear list, My SWIG generated module (myModule) needs an array-like object (carray) to work. Carray objects are created both internally (in C++ level) and through Python so I have to load it when myModule initializes. carray is modified from arraymodule.c and is quite simple: static PyMethodDef a_methods[] = { {"carray", a_array, METH_VARARGS, a_array_doc}, { /* sentinel */ NULL, NULL } }; Currently, I load a_methods directly using code (error checking ignored) PyObject* mm = PyImport_AddModule("__main__"); PyObject* dict = PyModule_GetDict(mm); PyObject* v = PyCFunction_New(a_methods, NULL); PyDict_SetItemString(dict, a_methods->ml_name, v); There are several problems with this approach: 1. use of __main__? carray can not be accessed directly within other libraries. ('from myModule import *' DOES NOT import carray!) I tried to use __builtins__ but it does not work for some reason out of my understanding of Python. I am not sure how to add carray to myModule dictionary. 2. No type object? I am not sure what is the purpose of ArrayType but the usual init_module should be m = Py_InitModule3("carray", a_methods, module_doc); d = PyModule_GetDict(m); PyDict_SetItemString(dict, "ArrayType", (PyObject *)&Arraytype); When I add ArrayType to __main__ , access to ArrayType leads to a quick core dump. I do not feel comfortable with my current approach. Could anyone tell me some better (more standard) way? Many thanks in advance. Bo

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Re: How do you do arrays
by Erik Max Francis Feb. 2, 2005

Feb. 2, 2005

Dennis Lee Bieber wrote: > Classic BASIC actually splits the difference. > > dim a(10) > > allocates 11 elements, indexed 0..10 -- but most classes tend to ignore > element 0, and algorithms are as if only 10 elements exist starting at > 1. Basic also has the OPTION BASE instruction, which affects that. -- Erik Max Francis && max(a)alcyone.com && http://www.alcyone.com/max/ San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis War is like love, it always finds a way. -- Bertolt Brecht

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