🌐 Mailman 3 July 2007 - Python-list - python.org

Re: Where do they tech Python officialy ?
by Neil Cerutti July 28, 2007

July 28, 2007

On 2007-07-28, Omari Norman <omari(a)smileystation.com> wrote: > On Mon, Jul 23, 2007 at 10:48:10PM -0700, Paul Rubin wrote: > >> If you're having trouble with Python because you're new at >> programming, I can sympathize--I don't think it's the most >> beginner-friendly of languages despite the efforts in that direction >> by the designers. > > Just curious--what language would you recommend as most > beginner-friendly? I recommend the symbolic logo-like Scheme used in _Simply Scheme_. It works with sentences and words polymorphically. (first smith) s (first '(smith jones cooper)) smith The books exercises revolve around writing functions like pig-latin, reverse, palindrom?, and other word and sentence manipulations. Real Scheme primitives are not introduced until lots of programming ideas have been conveyed. http://www.amazon.com/Simply-Scheme-Introducing-Computer-Science/dp/0262082… > In college I had a programming course that used C++. Big > mistake in my view, and we didn't learn much in the way of true > principles (in retrospect it would have been nice if they had > us use GCC rather than Borland on Windows.) I can imagine a course using C++ that taught basic programming concepts; it would teach the rudiments of using the STL to start, and work with vectors, lists and maps. See _Accelerated C++_ for a great example. But most C++ courses start with the lowest level functionality of C++, soon embroiling inexperienced programmers with the difficulties of manual dynamic memory management. That's a big side-show. -- Neil Cerutti

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Re: Reading data from an ISA port
by Diez B. Roggisch July 28, 2007

July 28, 2007

Gabriel Dragffy schrieb: > Dear list members > > I must admit I am a new user of Python, but it is a language that I > enjoy using. > > For one of my university projects I need to write a program that can > read several bytes from an ISA port. It has been suggested to me that I > look at using C or Pyinline. If I can I would prefer to continue to use > Python, and Pyinline won't play ball. > > I am sure Python can do this for me, but the question is how? What > modules and code do I need to look? I'd be very grateful for any > suggestions and advice. Python as-is won't help. It has no concept of memory addresses and direct access to them. However, a trivial C-extension together with the struct and/or ctypes module will help. What you essentially need to code is a C-extension that will allow you to directly access memory. Wrap that either in an extension or using ctypes. Diez

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Re: a simple string question
by Zentrader July 28, 2007

July 28, 2007

On Jul 27, 11:26 am, Wildemar Wildenburger <wilde...(a)freakmail.de> wrote: > vedrandeko...(a)v-programs.com wrote: > >> If I understand you correctly you want to replace ";" by ";\n" and ":" > >> by ":\n\t\t\t\t\t\t\t". > >> Well guess what? The replace() method does just this. Have a read: > >> <URL:http://docs.python.org/lib/string-methods.html> > > > No,that's not what I need... > > When this function detect ";" or ":" ,it must append character "\n" or > > "\n\t" ahead ":" or ";" another e.g > > > 1) text="Hello world;Hello:Hello2" > > > 2) When function detect ";" or ":" it must append character "\n" or "\n > > \t" ahead ":" or ";", so that must look like this: > > > NEW TEXT : "Hello world;\nHello:\n\t\t\n\n\n\n\n\nHello2" > > Isn't that what I said? > > Please note that appending "\n" to ";" is the very same thing as > replacing ";" with ";\n". > > Also note that the your description of the desired behavior does not > match your example. You say "append "\n\t" after ":"", but thats not > what happens in your example. There you append "\n\t\t\n\n\n\n\n\n" > instead of "\n\t". That is confusing to me. Can you explain? > > /W Confusing to me also. I read this as replace the first ";" with ";/ n", replace the first ":" with "\n\t\t\t\t\t\t\t", and on from there with different requirements. If that is the case then you have to locate the first, second, etc. and add/replace with the appropriate code. String.find and split would have to be used instead of a string.replace if you want to make different changes depending on if it is the first, second..., occurrence.

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Tkinter program with a usable interpreter console
by beginner July 28, 2007

July 28, 2007

Hi everyone, I have a question about Tkinter programs. What I want is a GUI window along with an interpreter window, so that I can do things by clicking on the GUI or typing commands in the interpreter console. For example, I wish I can type in the console: >>> modify_my_key_data() >>> update_gui() and my gui is modified for me. The problem is that the Tkinter program ends with a .mainloop() call and it is not going to give back control to the command prompt. I feel it is almost like I need to implement the python shell myself. Is there any better way of doing this? Thanks, beginner

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Tkinter -- Show Data in an Excel like Read-Only Grid
by beginner July 28, 2007

July 28, 2007

Hi All, I am really new to Tk and Tkinter. I googled the web but it was not mentioned how to build a data grid with Tkinter. Basically, I want to show an excel like data grid with fixed column and row headers and sortable columns. But the grids can be read-only. Can anyone give some hint on implementing this? Thanks, beginner

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Re: slow emails
by jjl＠pobox.com July 28, 2007

July 28, 2007

Gabriel Dragffy <gabe(a)dragffy.com> writes: > Whenever I post to this list my email invariably takes ages to show > up - perhaps two days or so. Often times not at all. Why is this? > > I am subscribed to Ubuntu mail list which is also high traffic, and > my posts show up there within minutes. No idea, but you could try posting through Google Groups or gmane.org instead. The latter is a newsfeed, so you need a newsreader program to post using that (to find the gmane newsgroup for python-list, click on "Lists" on the gmane.org front page, and type python-list in the search box). John

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Wikicodia - The code snippets wiki
by Wikicodia Admin July 28, 2007

July 28, 2007

Dears, Wikicodia is a wiki based project for sharing code snippets. We're collecting large number of code snippets for all code-based programming languages, scripts, shells and consoles. We wish you could help us. We're still BETA. Your suggestions, ideas and criticisms are very welcomed. We're waiting for you contributions. You can easily share and search our snippet using our Google Desktop Gadget. Share your Python snippets to help the world :) http://www.wikicodia.com Thanks Wikicodia Admin

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Re: Compile python with Mingw
by iwinux July 28, 2007

July 28, 2007

fdu.xiaojf(a)gmail.com 写道: > Hi all, > > > I was trying to build pymol with mingw on my windows box, but during the > compilation it said that my python.exe was built with VS2003, and in > order to build compatible binary executable file, I have to build pymol > with VS2003. I don't have VS2003, so I think I may compile both pymol > and python with mingw. > > Can somebody give me some hints on how to build python with mingw? I > have googled the web, and it seems that few people have tried mingw > with python. I have found mingwpython, but it's not for python 2.5. > > Thanks. To build python with mingw, there is a common way. First you should install msys, which can be downloaded from mingw's website. Run msys and type 'cd /path/to/source'. Then type "./configure & make & make install". And you will get a python built with mingw.

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Process Control Help
by tylerca＠jeld-wen.com July 28, 2007

July 28, 2007

I'm attempting to start some process control using Python. I've have quite a bit of literature on networking, and have made some tinkering servers and clients for different protocols HTTP, FTP, etc... But now it's time for the murky web of industrial protocol. I'm looking to start with IO and servo controls via Ethernet. Questions: Is there an existing forum on this already? What protocols are the most python friendly? i.e. are transparent enough that i can create my own python driver. (or do these drivers exist?) What ethernet accesible servo and IO industrial devices have people had success with?

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Re: removing items from a dictionary ?
by martyw July 28, 2007

July 28, 2007

Stef Mientki wrote: > hello, > > I want to remove some items from a dictionary, > so I would expect this should work: > > Nets = {} > ... fill the dictionary Nets > > for net in Nets: > if net.upper() in Eagle_Power_Nets : > del Nets [ net ] > > > But it gives me > Message File Name Line Position > Traceback > ? D:\data_to_test\JALsPy\Eagle_import.py 380 > RuntimeError: dictionary changed size during iteration > > > Now I can solve this problem in the following way > > power_nets = [] > for net in Nets: > if net.upper() in Eagle_Power_Nets : > power_nets.append ( net ) > > # remove power nets from netlist > for net in power_nets: > del Nets [ net ] > > > But I wonder if this is the best way to manipulate a dictionary, > because I've to do more "complex" operations on the dictionary, > like joining items, > I would like to have a better understanding of what can and what can't > be done. > > thanks, > Stef Mientki Remoing elements from a dict is done with del, try this; >>> d = {'a' : 1,'b' : 2} >>> del d['a'] >>> print d {'b': 2} >>> maybe you can post a working snippet to demonstrate your problem

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