CRC16

Anyone know a module that does CRC16 for Python? I have an aplication that I need to run it, and am not having alot of sucess. I have a program in C that uses a CRC16 according to CCITT standards, but need to get a program that tests it with python as well. Thanks! -- http://mail.python.org/mailm

Re: CRC16

I should probably have mentioned that my code is just 6 bytes long, we send an 8 byte data packet with 2 bytes CRC. There's a CRC poly of 0x1021. Still having a bit of problems, but it's coming, thanks for the help! -- http://mail.python.org/mailman/listinfo/python-list

The ^ operator

What exactly does the ^ operator do? I've seen, for example, that 3^4=7, 3^5=8. but 3^3=0. Is it just adding them together if they are not equal, and if they are equal, outputs 0, or what? Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Re: The ^ operator

Thanks alot! That sure makes lots of sense! -- http://mail.python.org/mailman/listinfo/python-list

ASCII

Is there a function that will take a char. and return the ascii value? Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Re: ASCII

Thanks alot! -- http://mail.python.org/mailman/listinfo/python-list

Extending Python

I am looking for a good tutorial on how to extend python with C code. I have an application built in C that I need to be able to use in Python. I have searched through various sources, starting of course with the Python site itself, and others, but I felt a bit lacking from the Python site, it seem

Re: Extending Python

Perhaps it would be nice if they could include in the python documents a link to download a sample code, the one that they were building in the whole program, or at least a page that puts it all together? I get a much better idea of how thing work when they are all put together personally, and then

Library functions

I am writing a program that mimics a program written in C, but using Python-supiorior techniques. The C program calles a library function, non-open source, I only know that it sends it a command LINUX_CAN_Open() as for a few others as well. Is there a way I can call this function from Python withou

Re: Library functions

How exactly do you do that? Just to get some kind of an idea, perhaps you could share bits of code? Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Re: Mutual module imports

The trick is via something called Extending. Pyrex just makes extending a bit easier, but, depending on the complexity of the function, it might be easier just to extend it yourself. Basically you make a function that translates python into C. There are some instructions on the Python website, http

Extention Module/ list of chars-> string

I am currently writing an extention module that needs to recieve a list of characters that might vary in size from 0 to 8. This is written as a list of characters rather than a string because it's easier to manipulate. However, when I pass this list of characters into the extention module, it keeps

Extention Woes

I am in the process of writing an extention module, and am coming up with lots of problems. Perhaps someone could be of use. I keep getting data that isn't what I'm sending the program. Let me give the line of C code and Python Code and output to illistrate the problem. write_can(can_han,0x0140,'a

Re: Extention Woes

I tried Ctypes, but it was giving me tons of problems in the install phase, and so I decided it'd just be better to use an extention module. It's the type of stuff that could be perfectly done with ctypes, but... Oh well. Also, I've done all but this last little piece with extentions, might as well

Re: Extention Woes

Forgot, var declartions int can_han; int com; char len; char dat[8]; -- http://mail.python.org/mailman/listinfo/python-list

Re: Extention Woes

Well, the point of declaring it as a char was to have it as an 8 bit integer, as is requested later on in the program. Anyways, I tried making the changes, similar results. The len value was always right, the problem seems to be in this com value. BTW, it doesn't give me one single warning, so I do

Re: Extention Module/ list of chars-> string

Thanks for the help, I actually ended up writing my own simple charlist2string function, I realized it was only about 4 lines of code, but, appreciate the help! -- http://mail.python.org/mailman/listinfo/python-list

Re: Extention Woes

Never mind, problem solved. The other problem I was having was I forgot to put the .so at the end of a file, so it didn't change anything. Thanks for all of the help! -- http://mail.python.org/mailman/listinfo/python-list

Extention String returning

I have been writing a program that is designed to return an 8 byte string from C to Python. Occasionally one or more of these bytes will be null, but the size of it will always be known. How can I write an extention module that will return the correct bytes, and not just until the null? I would thi

Re: Extention String returning

Thanks for the help! -- http://mail.python.org/mailman/listinfo/python-list

Jpg

I am building a GUI interface at the moment, and would like to have support for displaying a jpg file, and a FITS file if possible. Is there any way to do this? My interface has been written in Tkinter at the moment, especially because of it's great portability, I wouldn't have to install the other

Tkinter Frame Size

I'm tyring to set the size of the window that is opened when you open a Tkinter window, without much sucess. I have tried changing the heigth and width atributes, but it doesn't do anything. I tried using the grid_propagate command that I saw to use, but made the window even smaller... What can I d

Re: Tkinter Frame Size

Okay. I have alot of items that are put on the basic frame already, using a grid method. Will this change anything? -- http://mail.python.org/mailman/listinfo/python-list

Threading

I am trying to write a thread that will execute a function every 2 seconds until the program is close, in which case it will stop. I can write the program easy enough to execute the command every 2 seconds, the problem comes when I try to close the program. It won't close the thread. Any ideas as t

Re: Threading

That helps alot with the Daemon and recipe! Thanks for the help! -- http://mail.python.org/mailman/listinfo/python-list

Threading-> Stopping

Is there a way to stop a thread with some command like t.stop()? Or any other neat way to get around it? Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Re: Threading-> Stopping

Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Tkinter- checkbutton

I want to have a checkbutton that when it is pushed will do a function depending on if it was pushed before or not. Ei: b=checkbutton(command=check) b.grid(row=0,column=0) def check(): if (b.value==0): do_stuff_here() elif(b.value==1) do_other_stuff_here() However,

Re: Tkinter- checkbutton

Ere, ignore the mis-capped Checkbutton and the missed master call in it... -- http://mail.python.org/mailman/listinfo/python-list

Tkinter- New Window

Is there a way to make a new window pop up using Tkinter? I have some functions that require more data in my interface than I have space for, and would like to be able to pop up a new window to request this information. Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Re: Tkinter- New Window

Okay, never mind about my first question, I got that answer by using Toplevel. However, there' s still a question to be answered. I popped up this new window with the intent to have something like this: "what is your question" Ei, there's a question popped up, a label that

Re: Tkinter- checkbutton

That solved the problem. Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Tkinter- Building a message box

I've been trying to build a fairly simple message box in tkinter, that when a button is pushed, will pop up a box, that has a line of text, an entry widget, and a button, that when the button is pushed, will return the value in the line of text. However, while I can read the value of the button, I

Re: Tkinter- Building a message box

Do you have any info on dialogs? I've been trying to find some, without alot of success... -- http://mail.python.org/mailman/listinfo/python-list

Re: Tkinter- Building a message box

Thanks alot, that helped TONS! Just had to modify it slightly, but, well, it works great now. Thanks! -- http://mail.python.org/mailman/listinfo/python-list

PIL-> Tkinter

Is there a way to put an image loaded from PIL into a TKinter GUI? Without converting the image to a .bmp, and using a canvas? If that's the only way it'll work, I'll take it, but... It would be nice otherwise... -- http://mail.python.org/mailman/listinfo/python-list

Re: PIL-> Tkinter

That would be extremely useful.Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Floating numbers and str

I would like to limit a floating variable to 4 signifigant digits, when running thorugh a str command. Ei, x=.13241414515 y=str(x)+" something here" But somehow limiting that to 4 sign. digits. I know that if you use the print statement, you can do something like %.4d, but how can I do this with

Re: Floating numbers and str

Yep, I was thinking in C, not python. Thanks for the help! -- http://mail.python.org/mailman/listinfo/python-list

Re: Floating numbers and str

Wait, one more question. If the number is something like: 1.32042 It is like "1.32 stuff" I would like it's size to remain constant. Any way around this? -- http://mail.python.org/mailman/listinfo/python-list

LARGE numbers

I've been thinking about writing a program to generate the world's largest prime numbers, just for the fun of it. This would require being able to hold an 800 digit number into memory (25 megabits, or a little over 3 megs of memory for just one variable...) I would also need several smaller var

PIL- error message- cannot open libtiff.so.3

Okay, so I've been getting this error message when trying to use PIL to open a JPEG, that there isn't a library by the name of libtiff.so.3 . I've been searching the documentation, there isn't any reference to this library. Also, I don't know why it's doing this as I'm trying to open a JPEG, and no

Re: LARGE numbers

Well, as I'll be doing lots of multiplication, guess that GMPY is the way to go. I'll use DecInt only for converting to strings if I find anything interesting. This is all just kind of a theoretical aproach, but, it can be lots of fun. Who knows if Python'll help find the largest prime number ever?

Re: PIL- error message- cannot open libtiff.so.3

I got it from the PIL website, version 1.1.5. I guess it's possible that there's another library Image on the computer that it could be confusing? I'm looking for new things. Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Re: PIL- error message- cannot open libtiff.so.3

Oddly enough, that seems to have solved the problem. Duh. Take the simple solution first. Thanks for the wake up call! -- http://mail.python.org/mailman/listinfo/python-list

Re: PIL- error message- cannot open libtiff.so.3

Well, it seems to have resolved the problem. Don't know what was causing it to begin with, but I'll take it... -- http://mail.python.org/mailman/listinfo/python-list

Tkinter Images

I've been trying to use a canvas to display different pictures on a Tkinter interface. However, it doesn't seem to update the information. Ei, I have something like this. canvas=Canvas(master,blah...) canvas.pack() def change_pic(path): global pic image=Image() #I'm using PIL to

Re: Tkinter Images

Update: I can put the image in, but it spits out errors, adding this to it: canvas.insert(pic) BTW, I noted that my code was written incorectly The function should be as follows: def change_pic(path): global pic image=Image() #I'm using PIL to use the images, but I don't think

Quene

I am trying to write a function that holds a variable-length quene. The quene has 2 bits of information. At some point, I would like to remove bits of this quene, when they are completed. Is there a way to do this with something as follows? quene=[] quene.append((4,2)) quene.append((3,6)) if(4 in

Re: My Python Website

Thanks for the suggestions, I've put them on the page already. I used .zips so as not to confuse anyone that it's some kind of a file, but, I have used the formentioned sourcecode 2 HTML colorizer to put up nice web previews, as well as commenting the code a bit more. Thanks for your help! -- htt

Python GUIs

I have a program that I am devoloping, that uses python as a GUI interface for a camera that we am building. Our camera is controlled using an 8 byte control squence, depending on the command, will have several configurations for each byte. I need to be able to have some way to manage all 8 bytes w

Re: Python GUIs

As a bit more of an update, I have decided to create a list of strings, but am having a problem. To illistrate this in a simple manner. B='\x12','\x32' B[0]='\x12' I cannot get this to work, and I need to get it to work somehow. How can I make it happen? Is there a function that I should use, a s

Re: Python GUIs

Thank you very much! That managed to fix the problem! -- http://mail.python.org/mailman/listinfo/python-list

IsString

I need a function that will tell if a given variable is a character or a number. Is there a way to do this? Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Re: IsString

LOL. As to me being a newbie to programming, well, I've been programming to some extent for the last 10 years, although never professionally. The first few questions were enough to help me solve the problem that I had. And I've been programming Python for 4 months or so, but it's been pretty intens

Re: IsString

I don't know if I can help with this much, I'm still somewhat new to python, but it is my understanding that "simple" variable, ei, strings, ints, etc, although they don't have such names, behave like variables, ei, if you pass them to a function, the function will copy them into a new spot. Howeve

Tuples

Let's say I make a program something like follows: x=[] x.append([1,2,3]) x.append([4,5,6]) print x print x[0] print x[0][1] x[0][1]=5 Okay, everything works here as expected except the last line. Why won't this work? Thanks for the help! -- http://mail.python.org/mailman/listinfo/python-list

Re: Tuples

Never mind, I just realized that my code was actually a list inside of a tuple, and not a tuple inside of a tuple, thus giving the confusion that it had. Thanks for the help! -- http://mail.python.org/mailman/listinfo/python-list

Browse type function

I am building a GUI interface with Tkinter. I need to have a way to open and save files. Is there a nice GUI that can do that for me, ei, show what files are avaliable, a choose file type function? If it matters any, I am planning on running this on both windows and linux. Thanks for the help! --

Re: Browse type function

Thanks for the help! -- http://mail.python.org/mailman/listinfo/python-list

tkinter canvas tag stuff

I'm trying to display a picture on a Tkinter Canvas. It seems to work fine the first time that it is displayed. However, subsequent times running shows an error like this: TCLerror: Wrong # args: should be ".-1211472948 .-1211470996 addtag tag searchCommand ?arg arg ...? My code works like this:

Raw images

I have an image that is in a "raw" format, ei, no place markers to tell the dimensions, just a big group of numbers. I happen to know the dimension of this array from a different source. I would like to be able to display it. Is there a way to do this easily? I know that several libraries use a "ra

Re: Raw images

That will definatly help. Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Re: Raw images

Well, the numbers are in a string of variable length. My camera can read specific parts of it's display, so an image of 1024x1024 is just as likely to happen as one of 16x342. Well, not really, but they both could happen. The data is passed by giving the dimentions via a seperate protocol, and then

Re: tkinter canvas tag stuff

It's funny, I can put in more variables than needed, it doesn't even call the function, and yet, magically, the picture appears. Odd... Just wish I could solve the problem... -- http://mail.python.org/mailman/listinfo/python-list

Re: Raw images

Well, it's a custum-built camera, so it's not standard by any means. That being the case, I know it's exact format, which is as follows. It is a stream of 16 bit numbers, each representing a point on a grid. The grid is define in a seporate way, outside of the format, but is given a number of rows

Re: Raw images

That did the trick, I can now remove the bad tag statement, and it all works just nicely. Thank you very much! -- http://mail.python.org/mailman/listinfo/python-list

Resizing of PIL images

I am seeking a way to resize a PIL image, even if the original is a smaller dimention than the new size. Resizing seems to only make an image smaller, and not larger. I have a 700x700 sized picture, sometimes that will display an image larger and other times smaller. Is there an easy way to do this

Tk not displaying correctly

I am building a TK interface, that has several threads. If all threads are running actively, including the main one, the interface doesn't update. For example, I have something like this, although more complex import time, threading master=Tk() def thread: global x x=0 while(TRUE): x=x

Re: Resizing of PIL images

I used thumbnail originally, and am using resize now. Perhaps it has to do with the image type (That is based on strings), but the resize function just didn't do it for me. No idea why... Oh well, probably just a problem for me, but, I've found a way around it, for the time being. -- http://mail.

Re: Tk not displaying correctly

Any way you could provide a fairly simple example, or a website that shows it? I understand that I must create a thread for mainloop, however, I can't see how to make that work, every time I do, it ends the program only a few seconds late. Will I have to make an even for all buttons, etc that are o

Oddities of Tkinter

I am building a tkinter program. A part of this program is to read data from an incoming interface, and depending on the data, will display a bit of text on the tk dialog, it decodes this data, so to speak. If one command is sent, everything's just fine. When multiple are sent, the program will sto

Re: Oddities of Tkinter

Nope, that's the oddest thing about it all... Perhaps the statement is called twice or something along those lines, but there again, I can't see how it would be... -- http://mail.python.org/mailman/listinfo/python-list

Re: Oddities of Tkinter

Only 1 process initiated Tkinter.Tk. I guess this'll just be a tough bug hunt... It drives me nuts that it should work, it just doesn't for some reason... I guess I can try various things to make it work, but, well, I would rather that it just works to start out with... -- http://mail.python.org/

Re: Oddities of Tkinter

I thought I mentioned that I'm running in linux, and yes, there are threads involved. I just don't know why on one machine that it would run so differently than another. As to re-writing my whole code, well, I've got around 2500 lines of code, and while re-writing would be faster I'm sure, I still

Possible memory leak?

I have a function in a program that works something like this. def load_pic_data(width,heigth,inpdat, filt=TRUE): data='' total=0 tnum=0 size=100 for y in range(0,heigth): row='' for x in range(0,width):

Re: Possible memory leak?

Hmm. The problem is that the required form for the image is as a string of characters to convert with the tkimage interface, at least, as I understood it. Perhaps an array would work, I'll try that when I get ahold of the computer in question (One thing required is a linux only library, and I don't

Re: Possible memory leak?

Oh, I should also mention, I used a memory monitor and saw the amount of memory being used go up with time, even when the function ended, meaning I did the 10 128x128 pictures, never was any memory dealocated until I exited the program. -- http://mail.python.org/mailman/listinfo/python-list

Re: Possible memory leak?

FYI, to all who asked, I was indeed just simply monitering the system memory. I changed my approach to one that uses arrays and simply joins the statements together at the end, it seems to have improved the speed. However, for some reason it still takes a small eternity to process on one computer,

Re: Possible memory leak?

Very interesting results with the last test. I guess I go back to my other code then, even if it is only a hair faster, it's still faster... It's odd, I just ran another test. There's 2 ways I can call my load_pic function, first of all, through taking a picture, secondly by loading a picture. Fo

Re: Possible memory leak?

Fredrik Lundh wrote: > Giovanni Bajo wrote: > > > --- foo.py - > > def iters(n): > > s = '' > > for i in xrange(n): > > s += chr(i%64) > > return s > > > > def iters2(n): > > L = [] > > for i in xrange(n): > > L.append(chr(i%64)) > > return "".join(L

Re: Possible memory leak?

The times that I posted was the time that it took to perform ONE row iteration. As you can see, the time was going up, fairly dramatically. Why on earth could it be doing this? I understand the the time will fluctuate somewhat depending upon what else the CPU is doing, but, why is the base time inc

Re: Possible memory leak?

I have made one confirmation. The only identifiable difference that I have seen is that one runs on python 2.4.2, and the other 2.4.1. Oddly enough, it's the first one that's the one that is having more problems than the second... Why that is, I don't know. It still could be something else, but...

Re: Possible memory leak?

The reason it's done in width and heigth is that there is some other non-related processing functions that were going on in the mean time with the problem. I found the source of the slow-down, when 2 non-important lines of code were commented out, the program worked perfectly.

determinant

I am trying to find a nice function that quickly determines the determanant in python. Anyone have any recommendations? I've heard about numpy, but I can't get it to work (It doesn't seem to like the import Matrix statement...). Thanks! -- http://mail.python.org/mailman/listinfo/python-list

Re: determinant

I am using Windows, using Python 2.4. Perhaps I just did the import statement wrong? I've never installed a library in Windows before, perhaps I did something wrong there too.. But anyways, it just doesn't seem to work. The import statements were: import Matrix, LinearAlgebra Neither seem to work

Re: determinant

Never mind, I realized I was using a bit of code way too old. I just needed to change the import statements to: import numpy.matrix import numpy.linalg Thanks for the help! -- http://mail.python.org/mailman/listinfo/python-list

Thread imbalance

I have a program running several threads. One of them must be done every (Specified time, usually 1 second). The whole point to having a thread is do this. However, I've noticed the following. When there is another part of the program that is active, this thread slips into disuse, ei, it's only ran

Re: Thread imbalance

The stuff that it runs aren't heavily processor intensive, but rather consistant. It's looking to read incoming data. For some reason when it does this, it won't execute other threads until it's done. Hmmm. Perhaps I'll just have to work on a custom read function that doesn't depend so much on proc

Re: Thread imbalance

The read function used actually is from a library in C, for use over a CAN interface. The same library appears to work perfectly find over C. I wrote an extention module for it. The function t_config is the threaded function that will call a function called config once per second. Note the time.tim

Re: Thread imbalance

Adding that bit of code seems to have fixed the problem, thanks alot! -- http://mail.python.org/mailman/listinfo/python-list

Canvas clicking stuff

I have a picture that is being displayed on a canvas interface, that I want to do the following. When a mouse button is clicked on the canvas, I want to pass to a function the X and Y coordinates of where this mouse button was pushed. Futhermore, and I don't know if this is possible, I would like t

Re: Canvas clicking stuff

I guess I should have mentioned that the canvas is a Tkinter canvas, but, well, I guess that could be infered. -- http://mail.python.org/mailman/listinfo/python-list

Re: Canvas clicking stuff

Ahh, exactly what I was looking for. Thanks for the help! Fredrik Lundh wrote: > Tuvas wrote: > > > I have a picture that is being displayed on a canvas interface, that I > > want to do the following. When a mouse button is clicked on the canvas, > > I want to pass t

Tkinter Event Binding Double-click

I am trying to execute a function with a tkinter event binding double click. With 2 mouse clicks done quickly, the function should happen, otherwise, it should not. However, I am noticing that the time that the event binding of a double-click is quite long, on the order of a second or so. I am doub

Module question

I know this is probably a very simple question, but I am building a program that is now at about 2400 lines of code in the main module. I need to break it up, however, there are certain variables that I would like to use among all of them, namely the TKinter background. It's build using tkinter, so

Re: Module question

Could I just do this then? from foo import x? One more question now that I've tried this. In my main function, I have alot of init code. I don't want this code to be re-ran when the second module imports the first. Is there any way around this? Thanks! -- http://mail.python.org/mailman/listinfo

Re: Module question

Most of these are indeed independed of Tkinter, except for a status report message that is often sent in response. I' have a few small files already that do this, however, I would ike to be able to put several that do in fact need to post status messages as well. There are about 2400 lines of code

Re: Module question

Ahhh. Actually, I realized my problem was the fact that not everything had been loaded yet. Circular loading can be a bit difficult I can see... I guess I need to import the new module after x has been declared? Ei, I need this. Mod1.py x=1 from mod2.py import * = Mod2.py from mod1

Random Prime Generator/Modular Arithmetic

I have made and recently posted a libary I made to do Modular Arithmetic and Prime numbers on my website at http://www.geocities.com/brp13/Python/index.html . I am currently in a crypotology class, and am working on building a RSA public key cryptology system for a class project. I am building the

  1   2   >