[Tutor] Search for hex data in file
I've been reading about ways to convert strings and what not to hex and back and forth. I'm looking for the fastest and least memory intensive way to search through a file for a hex value and gets its byte offset in the file. This hex value (that I'm looking for in the file) is of course a hex representation of the binary data and its 8 bytes long. I figured reading the whole file and converting it to hex from ascii..etc.. would be overkill, especially if its a large file. What do you guys recommend? I want to search the file for certain hex value and get the byte offset within the file. Thanks for reading. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Find a good linux distribution with python.
On Sun, May 24, 2009 at 4:44 PM, Alan Gauld wrote: > "Michael Bernhard Arp Sørensen" wrote > Most folks get by with the standard libraryb and a small number of > specialist modules to meet their specific needs. If you need a new > one install it, but loading lots of stuff just because its there is just a > waste of disk space IMHO. > >> create my own python repo to set up a good working environment for >> development. That way I could use any distro. > > By defaulyt Python keeps all its installed packages in the Python > directory structure so, effectively, you do build up your own repo. But > don't do it in advance just add to it as you need to. > >> On the other hand, any code I might write would be difficult >> for others to use. > > If you stick to the a standard Python package tools it should be fine. > Not just on Linux but on any other OS too. > > > -- > Alan Gauld > Author of the Learn to Program web site > http://www.alan-g.me.uk/ I agree with Alan. These days the trend seems to be in the opposite direction. I'm seeing developers keeping a "clean" Python environment and then installing additional packages into virtual environments. That keeps conflicts to a minimum and solves the problem of uninstalling unwanted packages. http://pypi.python.org/pypi/virtualenv Some developers even go so far as putting their Python environment under version control using something like Bazaar, git, or Mercurial (alphabetical order). This is in an effort to keep the contents of their Python environment under control. Once you have setuptools installed, it just too easy to type "easy_install spam" and get that package installed into your environment. The challenge is to control clutter in your environment. http://pypi.python.org/pypi/setuptools If you can keep your dependencies under control, then you can give users a reasonable set of requirements. If necessary, you can bundle things up for end users: http://www.py2exe.org/ http://svn.pythonmac.org/py2app/py2app/trunk/doc/index.html http://pypi.python.org/pypi/zc.buildout On the other hand, I do believe that Python needs an expanded distro for developers, but it would only contain a few extra things, such as the items mentioned above. -- Walker Hale ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] strings using Czech language characters
[ wish to make a dictionary of english to czech words / Unsupported
characters in input / ISO-8859-2 ]
have a look at the manual, in my case, section 4.9.2 on stand
encodings p. 149 of the 2.4.3 (lib.pdf) Python Library Reference and
at the python prompt try
>>> help('modules codecs')
-- vy
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Re: [Tutor] Find a good linux distribution with python.
"Michael Bernhard Arp Sørensen" wrote I'm on an eternal quest to find the perfect linux distro Don't wste your time. The distro doesn't make much difference beyond: - The basic file system structure and if it sticks to (one of) the standard then thats not a big issue - The package manager - you may prefer apt-get or yast or rpm or whatever - the installer, but you only use it once (sort of!) I've used Slackware, Redhat, Mandrake/Mandiva, Suse, Debian(briefly!) and a couple of lesser known ones. Once they were up and trunning I didn't find much difference with any of them! Therefore there's a lot of python stuff in the repository. The beauty of Python is that because it is platform independant it is also distro independant. Thus if you dowenloasd a python package and install it it will work regardless of distro. Another point: There's so many modules on the Internet, that it's difficult to get some sort of overview. Most folks get by with the standard libraryb and a small number of specialist modules to meet their specific needs. If you need a new one install it, but loading lots of stuff just because its there is just a waste of disk space IMHO. create my own python repo to set up a good working environment for development. That way I could use any distro. By defaulyt Python keeps all its installed packages in the Python directory structure so, effectively, you do build up your own repo. But don't do it in advance just add to it as you need to. On the other hand, any code I might write would be difficult for others to use. If you stick to the a standard Python package tools it should be fine. Not just on Linux but on any other OS too. -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few very basic questions
"M Tramp" wrote I've started trying ot learn about Python because ... Gramps, a genealogical To run Gramps on a Mac, I need to get GTK up and running. Have you checked fink? There's a MacOS Gimp toolkit package available. (Well 3 actually, gtk, gtk-data and gtk-shlibs) I generally use fink rather than try apt-get because I know the fink stuff is tested against MacOS. And fink packages are pre-built usually... (FYI, I have a Mac, running OS X 10.4.11. Xcode 2.5) 1) GTK has several dependencies, according to http://library.gnome.org/devel/gtk-faq/stable/c192.html ... pkg-config; GNU make; JPEG, PNG and TIFF image libraries; These should all be in place already FreeType; fontconfig; GNU libiconv library; GNU gettext; GLib; Pango; ATK. Not so sure about these though. Each of these may have dependencies as well. Is there someplace to go to figure out the order they should be compiled? apt-get should sort most of that out for you, it checks depemdencies and dependencies on dependencies etc. And if they are apt-get packages they should be either pre bu8ilt or apt-get should initiate the builds for you (I think, its been a while since I used it!) 2) Once each library is compiled, what should I have and where should it be on my hard drive? Using make (either directly or via apt-get) should sort that out. For example, when Python sees "import gtk" in which directory is it looking for GTK? Thats a different question because you need pygtk too and Python looks for the pygtk file which in turn looks for the real gtk library... And that should be a standard place that make knows about. How will GTK and the other libraries appear on my hard disk? As Unix executables or as frameworks or as something else entirely? In normal Unix it would be as libraries but under MacOS its entirely possible they show up as a Framework... 3) I am likely to do my Python programming inside Eclipse using pydev, though I have Xcode. In my experience Eclipse is a better option than XCode unless you are doing Aqua GUI programming XCode is great for Objective C but I never liked it for Python. The libraries will be in C, correct? Yes, mostly, some of the pygtk stuff may be in python. Will I be able to use Xcode to compile GTK and the rest, and then access the libraries inside Eclipse? You should be able to. You may have to set up some paths in Eclipe's preferences. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Find a good linux distribution with python.
On Sun, May 24, 2009 at 4:02 PM, Michael Bernhard Arp Sørensen wrote: > > What distro do you run? > Debian GNU/Linux > > Another point: There's so many modules on the Internet, that it's difficult > to get some sort of overview. That's why a distro is such a great idea > because so many packages with python stuff is included. Could you get any > kind of overview over python modules/libs other than a repo in a distro? > Like anything else that is huge, just tackle the parts of it that you need. > > I have concluded that there's no such thing as a perfect distro. Only some > distros come close to perfection. In that case I was wondering if I should > create my own python repo to set up a good working environment for > development. That way I could use any distro. On the other hand, any code I > migth write would be difficult for others to use. > > Any ideas or comments? > "Ubuntu" is an African word that means "I can't configure Debian." 8^D Knoppix, Ubuntu, and several other distributions are all based on the fine work that the Debian GNU/Linux community does. Debian GNU/Linux is completely Free, and is developed by volunteers from around the world. > > I use emacs with rope, ipython and python. I like those in newer versions if > not bleeding edge. > If you're really serious about having the 'perfect' distro, you can start with Debian GNU/Linux and make your own, the way you want it to be. While it is not a trivial matter to re-master a Linux Live CD, it is much easier than it used to be! You could pack it full of Python! It is this reason that there are hundreds of Linux Live CD distributions. Each person thinks that their distro is the best. This is one reason why GNU/Linux is so fantastic! > Med venlig hilsen/Kind regards > > Michael B. Arp Sørensen > Programmer / BOFH > Denmark > > "If you want to enter my network while I'm out, you can find my SSH-key > under my mouse mat" - Michael Bernhard Arp Sørensen > Why don't you make a Python-centric Linux Live CD? -- b h a a l u u at g m a i l dot c o m Kid on Bus: What are you gonna do today, Napoleon? Napoleon Dynamite: Whatever I feel like I wanna do. Gosh! ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] serious problem with graphics module
hello everyone i have a problem with python 3.0 graphics module: no problem while importing the module >>> import turtle but when i issue any command like: >>> t = turtle.pen() >>> t = turtle.forward(60) nothing appears on the screen, only a blank window, with nothing inside; may you give me some hint ? OS: win Xp thank you in advance ! -- roberto ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Find a good linux distribution with python.
Hi there. I'm on an eternal quest to find the perfect linux distro to base my work on. I'm currently running Ubuntu because its told that the Ubuntu creator Mark Shuttleworth is a python hacker. Therefore there's a lot of python stuff in the repository. What distro do you run? Another point: There's so many modules on the Internet, that it's difficult to get some sort of overview. That's why a distro is such a great idea because so many packages with python stuff is included. Could you get any kind of overview over python modules/libs other than a repo in a distro? I have concluded that there's no such thing as a perfect distro. Only some distros come close to perfection. In that case I was wondering if I should create my own python repo to set up a good working environment for development. That way I could use any distro. On the other hand, any code I migth write would be difficult for others to use. Any ideas or comments? I use emacs with rope, ipython and python. I like those in newer versions if not bleeding edge. Med venlig hilsen/Kind regards Michael B. Arp Sørensen Programmer / BOFH Denmark "If you want to enter my network while I'm out, you can find my SSH-key under my mouse mat" - Michael Bernhard Arp Sørensen ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] A few very basic questions
Hello all ... I've started trying ot learn about Python because I'm intrigued by what I've read about Gramps, a genealogical data manager. To run Gramps on a Mac, I need to get GTK up and running. Here's where I have a few, hopefully basic, questions. (FYI, I have a Mac, running OS X 10.4.11. Xcode 2.5) 1) GTK has several dependencies, according to http://library.gnome.org/devel/gtk-faq/stable/c192.html ... pkg-config; GNU make; JPEG, PNG and TIFF image libraries; FreeType; fontconfig; GNU libiconv library; GNU gettext; GLib; Pango; ATK. Each of these may have dependencies as well. Is there someplace to go to figure out the order they should be compiled? (I started with pkg-config, but it needs GLib) Possibly the best answer is to download the source for each and just start compiling? 2) Once each library is compiled, what should I have and where should it be on my hard drive? For example, when Python sees "import gtk" in which directory is it looking for GTK? How will GTK and the other libraries appear on my hard disk? As Unix executables or as frameworks or as something else entirely? 3) I am likely to do my Python programming inside Eclipse using pydev, though I have Xcode. The libraries will be in C, correct? Will I be able to use Xcode to compile GTK and the rest, and then access the libraries inside Eclipse? mt ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] strings using Czech language characters
On Sat, May 23, 2009 at 11:31 PM, Leon Williams wrote: > Hello, > > I wish to make a dictionary of english to czech words. I thought I would > first see if python will print a czech character. I used the example in the > tutorial (it uses a euro symbol, and a different iso character set so I > changed mine to include a character set that includes eastern european > characters). My results follow: > # -*- coding: iso_8859-2 -*- cz_c = u"č" > Unsupported characters in input The coding declaration only affects the encoding of program files, not the interactive interpreter. I have some notes here hthat may help: http://personalpages.tds.net/~kent37/stories/00018.html Try cz_c = "č".decode(sys.stdin.encoding) Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] need help opening a file in idle
"Meital Amitai" wrote
I am not sure how to open a file in my computer in idle.
You need to be clear what you are doing. You are not
opening the file in IDLE you are opening the file in Python.
IDLE is just the tool you use to write Ptython programs.
For my python class the homework states to write a function that accepts
the
name of a file and returns a tuple containing the number of lines, words
and
characters in the file. My problem is how do I get idle to first accept
the
name of a file.
You need to get Python to accept the name of the file.
And the biggest problem there is to identify the full path
of the file. To program successfully you will need to understand
where and how your computer stores files. On modern computers casual
users don't really need to know that kind of stuff but programmers do.
I created a file in text edit program saved with a .doc
extension, saved on my desktop. However the only way I have learned to
open
a file in my class is to write something like:
f = open('inputfile','r')
line = f.readline()
but when i type exactly that into my idle i get the following error
message:
Traceback (most recent call last):
File "", line 1, in
f = open('inputfile','r')
IOError: [Errno 2] No such file or directory: 'inputfile'
I'm assuming you realise that inputfile is a symbol that stands for
any file name it doesn't have to be literally inputfile... But the file
must exist before you can read it (the 'r' bit says you want to
read the file)
and when i ask it to open the actual file i created in my text edit
program:
file1.doc
f = open('file1.doc','r')
I get the same message.
You didn't tell Python to look in the Desktop folder
(Although that's not a good place to store files unless
you want a very confusing desktop! You would be better
to store it in MyDocuments)
I am not sure how to tell it to go to desktop folder in my computer where
i
saved that file. Am I missing something, and completely not getting the
point?
It's up to you to know where the file is and tell Python.
You might try this to find out where Python is looking for
the file by default.
import os
print os.getcwd()
Which prints what Python considers the Current Working Directory.
You will find a lot more on this topic, including a program for
counting words in a file in the Handling files topic of my tutorial.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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