Re: symbolic links, aliases, cls clear
On 2006-04-13, Barry Margolin wrote: In article [EMAIL PROTECTED], Chris F.A. Johnson [EMAIL PROTECTED] wrote: In fact, my scripts are portable to other terminal types by use of files for each terminal, generated with tput. Using a different terminal is as easy as . /usr/share/term-sh/$TERM or something similar. I generated a lot of files a few years ago, but I have never had any call for them, so I'd have to hunt for them. So you've essentially reinvented the whole termcap/terminfo mechanism? No, I've used the termcap/terminfo mechanism via tput to create a more efficient (and customizable) method of terminal-dependent control. -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: symbolic links, aliases, cls clear
On 2006-04-12, Floyd L. Davidson wrote: [EMAIL PROTECTED] wrote: If I may recommend an alternative, print \033[H\033[J the ansi sequence to clear the screen. Or so you would hope (however, that is *not* what you have listed!). Unfortunately, it is poor practice to hard code such sequences. I was bitten by that shortly after I started shell scripting. However, since all such code was isolated in functions, converting to a new terminal type was simple -- and quick. These days, the ISO-6429 standard (almost the same as the older ANSI x3.64) is so close to universal that I don't bother writing for anything else any more. If the need arises, I'll do it, but it will be simple to do, and much faster (both in coding and script execution) than trying to accommodate all terminals from the start. Instead the proper sequence should be obtained from the appropriate database (TERMINFO or TERMCAP), and the easy way to do that is, tput clear I still have a system which does not have tput. -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: symbolic links, aliases, cls clear
On 2006-04-12, Floyd L. Davidson wrote: Keith Thompson [EMAIL PROTECTED] wrote: tput clear (Or clear.) But /clear/ merely uses tput clear. Not on systems without tput. -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: symbolic links, aliases, cls clear
On 2006-04-12, jpd wrote: Begin [EMAIL PROTECTED] On 2006-04-12, Chris F.A. Johnson [EMAIL PROTECTED] wrote: These days, the ISO-6429 standard (almost the same as the older ANSI x3.64) is so close to universal that I don't bother writing for anything else any more. Oh, wonderful. ``All the world's a vax^W^WISO-6429 compatible'' all over again. If the need arises, I'll do it, but it will be simple to do, and much faster (both in coding and script execution) than trying to accommodate all terminals from the start. Yes, why use a perfectly good abstraction when you can hardcode stuff. If it were perfectly good, there would be no question; however, it's not. I still have a system which does not have tput. And that justifies everything else. Of course. If I want to write portable scripts, then yes, it does. -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: symbolic links, aliases, cls clear
On 2006-04-12, Christos Georgiou wrote: On Wed, 12 Apr 2006 15:59:05 -0400, rumours say that Chris F.A. Johnson [EMAIL PROTECTED] might have written: I still have a system which does not have tput. And that justifies everything else. Of course. If I want to write portable scripts, then yes, it does. Well, either port your system out of the window or port tput.c to your system and then start writing portable scripts. tput is part of the POSIX 1003.1 standard, and guess what the 'P' stands for in POSIX. It may be part of the POSIX standard, but there's nothing in the POSIX definition of tput that provides for cursor positioning or font attributes. The only defined operands are clear, init and reset. In fact, my scripts are portable to other terminal types by use of files for each terminal, generated with tput. Using a different terminal is as easy as . /usr/share/term-sh/$TERM or something similar. I generated a lot of files a few years ago, but I have never had any call for them, so I'd have to hunt for them. If you insist, I will retort to using Terry Pratchett references. UNCLE! -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: symbolic links, aliases, cls clear
On 2006-03-29, mp wrote: i have a python program which attempts to call 'cls' but fails: sh: line 1: cls: command not found i tried creating an alias from cls to clear in .profile, .cshrc, and /etc/profile, but none of these options seem to work. Why not call 'clear', since 'cls' does not exist? my conclusion is that a python program that is executing does not use the shell (because it does not recognize shell aliases). is this correct? Even shell scripts do not normally expand aliases. should i use a symbolic link? if so, where should i place it? what is the difference between aliases and symbolic links? What's the difference between a raven and a writing desk? if i execute a command like 'clear' to clear the screen, where does the shell look to find the command 'clear'? In a directory listed in the PATH variable. -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: Spelling mistakes!
On 2006-01-08, Terry Hancock wrote: BTW, one of the most common programming spelling errors is deprecate versus depreciate -- I wonder how many people actually realize that both words exist, but have entirely different meanings? The words overlap in meaning. Both can mean to disparage or belittle. Some dictionaries give 'depreciate' as a definition of 'deprecate'. -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: Spelling mistakes!
On 2006-01-08, Robin Becker wrote: Chris F.A. Johnson wrote: On 2006-01-08, Terry Hancock wrote: BTW, one of the most common programming spelling errors is deprecate versus depreciate -- I wonder how many people actually realize that both words exist, but have entirely different meanings? The words overlap in meaning. Both can mean to disparage or belittle. Some dictionaries give 'depreciate' as a definition of 'deprecate'. Well if someone told me my investments were deprecated I'd take that differently to them being depreciated. That's why I said overlap, not that they are the same. -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: reading files into dicts
On 2005-12-30, Tim Williams (gmail) wrote: Apologies for the top post, it was my first attempt at using gmail's pda-enabled web interface. There is no option to bottom post. Can you not move the cursor? -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: i=2; lst=[i**=2 while i1000]
On 2005-12-06, Steve Holden wrote: Daniel Schüle wrote: hi, [...] # pseudo code i=2 lst=[i**=2 while i1000] of course this could be easily rewritten into i=2 lst=[] while i1000: i**=2 lst.append(i) Neither of these loops would terminate until memory is exhausted. Do you have a use case for a 'while' in a list comprehension which would terminate? unless I am missing something obvious, I can not see why the loop should not terminate In that case, kindly explain how the condition i1000 can become false when it starts at 2 and never changes! [In other words: you *are* missing something obvious]. What does i**=2 do if not change i? i=2 lst=[] while i1000: ... i**=2 ... lst.append(i) ... lst [4, 16, 256, 65536] -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: wxPython Licence vs GPL
On 2005-11-26, Steven D'Aprano wrote: If you don't like that clause, you have two very simple options: don't redistribute the GPLed software. Or use some other software provided under a different licence. There is a third option: persuade the owner of the copyright to give you a different license. -- Chris F.A. Johnson, author |http://cfaj.freeshell.org Shell Scripting Recipes: | My code in this post, if any, A Problem-Solution Approach | is released under the 2005, Apress | GNU General Public Licence -- http://mail.python.org/mailman/listinfo/python-list
Re: os.popen('alias')
On 2005-11-18, Belebele wrote:
From an interactive python shell, I execute the following:
import os
for line in os.popen('alias').readlines():
print line
No aliases are printed.
I started python from an bash environment that had many aliases
defined. I expected to see the list of aliases from within the
interactive python shell.
Since bash does not export aliases, they cannot be seen by a child
process.
What could I do to see those aliases defined in the shell from where
I started python?
Store them in a file before calling python, and read that file.
--
Chris F.A. Johnson, author |http://cfaj.freeshell.org
Shell Scripting Recipes: | My code in this post, if any,
A Problem-Solution Approach | is released under the
2005, Apress | GNU General Public Licence
--
http://mail.python.org/mailman/listinfo/python-list
Re: os.popen('alias')
On 2005-11-19, Chris F.A. Johnson wrote:
On 2005-11-18, Belebele wrote:
From an interactive python shell, I execute the following:
import os
for line in os.popen('alias').readlines():
print line
No aliases are printed.
I started python from an bash environment that had many aliases
defined. I expected to see the list of aliases from within the
interactive python shell.
Since bash does not export aliases, they cannot be seen by a child
process.
What could I do to see those aliases defined in the shell from where
I started python?
Store them in a file before calling python, and read that file.
Or redefine them as functions and use:
import os
for line in os.popen('typeset -f').readlines():
print line
--
Chris F.A. Johnson, author |http://cfaj.freeshell.org
Shell Scripting Recipes: | My code in this post, if any,
A Problem-Solution Approach | is released under the
2005, Apress | GNU General Public Licence
--
http://mail.python.org/mailman/listinfo/python-list
Re: Goto XY
On 2005-11-09, [EMAIL PROTECTED] wrote: Is there some command in python so that I can read a key's input and then use a gotoxy() function to move the cursor on screen? e.g.: (psuedo-code) You can use curses, but that may be more trouble than it's worth. If you don't mind limiting your program to an ANSI-type terminals (vt100, xterm, rxvt, linux, putty, etc), then you can just use the codes to position the cursor: ESC = '\033' CSI = ESC + [ def printat(row,col,arg=): sys.stdout.write( CSI + str(row) + ; + str(col) + 'H' + str(arg)) When the right arrow is pushed, cursor gotoxy(x+1,y) To read a single keystroke, see Claudio Grondi's post in the thread python without OO from last January. Function and cursor keys return more than a single character, so more work is required to decode them. The principle is outlined in http://www.unixreview.com/documents/s=9920/ur0511a/ur0511a.html; the code there is for the shell, but translating them to python should be straightforward. I'll probably do it myself when I have the time or the motivation. -- Chris F.A. Johnson | Author: http://cfaj.freeshell.org | Shell Scripting Recipes: Any code in this post is released| A Problem-Solution Approach, under the GNU General Public Licence | 2005, Apress -- http://mail.python.org/mailman/listinfo/python-list
Re: Goto XY
On 2005-11-09, Jean-Paul Calderone wrote: On Tue, 8 Nov 2005 22:33:47 -0500, Chris F.A. Johnson [EMAIL PROTECTED] wrote: [snip] To read a single keystroke, see Claudio Grondi's post in the thread python without OO from last January. Function and cursor keys return more than a single character, so more work is required to decode them. The principle is outlined in http://www.unixreview.com/documents/s=9920/ur0511a/ur0511a.html; the code there is for the shell, but translating them to python should be straightforward. I'll probably do it myself when I have the time or the motivation. Like this? http://cvs.twistedmatrix.com/cvs/trunk/twisted/conch/insults/insults.py?view=markuprev=14863 More or less; probably much less. -- Chris F.A. Johnson | Author: http://cfaj.freeshell.org | Shell Scripting Recipes: Any code in this post is released| A Problem-Solution Approach, under the GNU General Public Licence | 2005, Apress -- http://mail.python.org/mailman/listinfo/python-list
Re: Goto XY
On 2005-11-09, Grant Edwards wrote: On 2005-11-09, Chris F.A. Johnson [EMAIL PROTECTED] wrote: Is there some command in python so that I can read a key's input and then use a gotoxy() function to move the cursor on screen? e.g.: (psuedo-code) You can use curses, but that may be more trouble than it's worth. In which case you could always use tput -- and it will still be portable. Not necessarily. There are differences in tput from system to system, not to mention how much it slows things down to call it for every sequence you need. Then there are some old systems which don't have tput. -- Chris F.A. Johnson | Author: http://cfaj.freeshell.org | Shell Scripting Recipes: Any code in this post is released| A Problem-Solution Approach, under the GNU General Public Licence | 2005, Apress -- http://mail.python.org/mailman/listinfo/python-list
Re: Getting Python Accepted in my Organisation
On 2005-11-05, Steven D'Aprano wrote: On Fri, 04 Nov 2005 20:55:48 -0500, Chris F.A. Johnson wrote: quoting deliberately removed to make a point So that people reading your reply know what you are commenting about. (Now, imagine that you're reading from a newsgroup where Chris' post has disappeared off the server, or perhaps never showed up at all.) Did I say something??? -- Chris F.A. Johnson | Author: http://cfaj.freeshell.org | Shell Scripting Recipes: Any code in this post is released| A Problem-Solution Approach, under the GNU General Public Licence | 2005, Apress -- http://mail.python.org/mailman/listinfo/python-list
Re: Getting Python Accepted in my Organisation
On 2005-11-04, [EMAIL PROTECTED] wrote: Alex Martelli wrote: It would still be easier to respond to your posts if you didn't top-post, though (i.e., if you didn't put your comments BEFORE what you're commenting on -- that puts the conversation in a weirdly distorted order, unless one give up on quoting what you're commenting on, or invests a lot of time and energy in editing...;-). oops. I developed this habit because I found I like to read it this way. As I usually would read just the first few lines to see if I want to read on. top post serve me well for this purpose. And I assume other may also find my stuff not worth reading and skip quick so why force them to scroll all the way down? If I want to read that way, I just tell my newsreader not to display the quoted material (actually it displays the first line of each block). Or I press TAB to jump to the next original material. I would only do in-line response type when there is a need for specific response in context. If there's not, why would you quote anything? -- Chris F.A. Johnson | Author: http://cfaj.freeshell.org | Shell Scripting Recipes: Any code in this post is released| A Problem-Solution Approach, under the GNU General Public Licence | 2005, Apress -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows vs Linux [was: p2exe using wine/cxoffice]
On 2005-10-26, Tim Golden wrote: [Sybren Stuvel] Tim Golden enlightened us with: Well, I'm with you. I'm sure a lot of people will chime in to point out just how flexible and useful and productive Linux is as a workstation, but every time I try to use it -- and I make an honest effort -- I end up back in Windows I'm curious, what do you mean with it in the part every time I try to use it? Fair question. I have, over the years, installed and used Gentoo, Vector, RH, Ubuntu Breezy (my current choice) and various other flavours and distros. When I use it I mean typically that I use whatever desktop-type thing presents itself to me -- Gnome or XFCE or Fluxbox, say -- one or more editors (I tend to try things out to see if they suit), and one or more command shells. All distros look the same to me, because I have an environment that I like, and I keep my home directory acros distros. As it happens, (and I suspect I'll have to don my flameproof suit here), I prefer the Windows command line to bash/readline for day-to-day use, including in Python. Why? Because it does what I can't for the life of me get readline to do: you can type the first few letters of a previously-entered command and press F8. This brings up (going backwards with further presses) the last command which starts like that. And *then* you can just down-arrow to retrieve the commands which followed it. If someone can tell me how to do this with bash/readline I will be indebted to them and it will increase my chances of switching to Linux a bit! (Although not at work where I have no choice!) In my ~/.inputrc: \e[a: history-search-backward ## shift+up-arrow \e[b: history-search-forward ## shift+down-arrow -- Chris F.A. Johnson http://cfaj.freeshell.org == Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress http://www.torfree.net/~chris/books/cfaj/ssr.html -- http://mail.python.org/mailman/listinfo/python-list
Re: An interesting question about print '\a'
On 2005-10-24, Anthony Liu wrote: We know that if we do print '\a' the bell will sound. Now, why do I hear the sound on my local machine when I run a python script on a remote host? I understand if I hear it when I do print '\a' on my local machine. Does the command get sent back to the client machine? The code is printed to stdout, which is your terminal. Your terminal interprets ^G as a beep. -- Chris F.A. Johnson http://cfaj.freeshell.org == Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress http://www.torfree.net/~chris/books/cfaj/ssr.html -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to replace first word in string?
On 2005-10-22, William Park wrote: [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I am looking for the best and efficient way to replace the first word in a str, like this: aa to become - /aa/ to become I know I can use spilt and than join them but I can also use regular expressions and I sure there is a lot ways, but I need realy efficient one I doubt you'll find faster than Sed. On the contrary; to change a string, almost anything will be faster than sed (except another external program). If you are in a POSIX shell, parameter expansion will be a lot faster. In a python program, one of the solutions already posted will be much faster. -- Chris F.A. Johnson http://cfaj.freeshell.org == Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress http://www.torfree.net/~chris/books/cfaj/ssr.html -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to replace first word in string?
On 2005-10-22, William Park wrote: Chris F.A. Johnson [EMAIL PROTECTED] wrote: On 2005-10-22, William Park wrote: [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I am looking for the best and efficient way to replace the first word in a str, like this: aa to become - /aa/ to become I know I can use spilt and than join them but I can also use regular expressions and I sure there is a lot ways, but I need realy efficient one I doubt you'll find faster than Sed. On the contrary; to change a string, almost anything will be faster than sed (except another external program). If you are in a POSIX shell, parameter expansion will be a lot faster. In a python program, one of the solutions already posted will be much faster. Care to put a wager on your claim? In a shell, certainly. If one of the python solutions is not faster than sed (e.g., os.system(sed .)) I'll forget all about using python. -- Chris F.A. Johnson http://cfaj.freeshell.org == Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress http://www.torfree.net/~chris/books/cfaj/ssr.html -- http://mail.python.org/mailman/listinfo/python-list
Re: Set an environment variable
On 2005-10-21, Christian wrote: Erik Max Francis wrote: Christian wrote: Can I write a .py script that calls a .sh script that executes the export command and then calls another .py script (and how would the first .py script look)? No, the shell script that the Python program would invoke would be a different process and so commands executed in it would have no effect on the state of another. So executing an .sh script that calls a .py script works different when executed from a command promt than when executed from a starter .py script? No; it's always the same: an environment variable will only be effective in the process in which it is set, and its children. When you call another program, whether it's a shell script, python script, or binary executable, you are starting a new process. Environment variables set in that process will not affect its parent (i.e., the process that called it). -- Chris F.A. Johnson http://cfaj.freeshell.org == Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress http://www.torfree.net/~chris/books/cfaj/ssr.html -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve simple python shell script (to compile list of files)
On 2005-10-15, Jari Aalto wrote:
[Keep CC, thank you]
Please suggest comments how can I make this script to work
from bash. Also how can I skip better the [0] argument from
command line without hte extra variable i?
#!/bin/bash
function compile ()
{
python -c '
import os, sys, py_compile;
i = 0;
for arg in sys.argv:
file = os.path.basename(arg);
dir = os.path.dirname(arg);
i += 1;
if i 1 and os.path.exists(dir):
os.chdir(dir);
print compiling %s\n % (file);
py_compile.compile(file);
' $*
}
Don't indent:
function compile ()
{
python -c '
import os, sys, py_compile;
i = 0;
for arg in sys.argv:
file = os.path.basename(arg);
dir = os.path.dirname(arg);
i += 1;
if i 1 and os.path.exists(dir):
os.chdir(dir);
print compiling %s\n % (file);
py_compile.compile(file);
' $*
}
compile $(find path/to -type f -name *.py)
# End of example
The error message reads:
File string, line 2
import os, sys, py_compile;
^
SyntaxError: invalid syntax
Jari
--
Chris F.A. Johnson http://cfaj.freeshell.org
==
Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress
http://www.torfree.net/~chris/books/cfaj/ssr.html
--
http://mail.python.org/mailman/listinfo/python-list
Re: HELP: Searching File Manager written in Python
On 2005-10-11, anton wrote: I am googeling some hours now ... still without result. So I have a question: Does somebody know a filemanager: - which looks like Norton Commander/7-Zip Filemanager What does Norton Commander/7-Zip look like? - where I can add python scripts which I can execute on a selected file I use gentoo (the file manager, not the Linux distro). It's not written in Python, but you can define buttons that will run any commands you like with the selected file[s] as arguments. http://www.obsession.se/gentoo/ -- Chris F.A. Johnson http://cfaj.freeshell.org == Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress http://www.torfree.net/~chris/books/cfaj/ssr.html -- http://mail.python.org/mailman/listinfo/python-list
Re: How do i read just the last line of a text file?
On Sun, 29 May 2005 at 05:57 GMT, John Machin wrote: Chris F.A. Johnson wrote: file = open(argv[1]) ## Open the file given on the command line all_lines = file.readlines() ## Read all the lines I see your shadowing and raise you one obfuscation: ;) open = file(argv[1]) ## File the open given on the command line all_lines = open.readlines() ## Read all the lines Such verbosity! (I excuse mine on the grounds that it was my first attempt at a Python program.) all_lines = file(argv[1]).readlines() And to answer the question in the subject line: last_line = file(argv[1]).readlines()[-1] Both of which assume from sys import argv. Now I have to get serious and forget those bad habits. -- Chris F.A. Johnson http://cfaj.freeshell.org == Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress http://www.torfree.net/~chris/books/cfaj/ssr.html -- http://mail.python.org/mailman/listinfo/python-list
Re: need help of RE
On Sun, 29 May 2005 at 07:39 GMT, cheng wrote: hi all a string like (word1 (Word2|woRd3)) how can i use the re to split it to ['word1', 'word2', 'word3'] This splits the string on one or more occurrences of any character that is not alphanumeric: import re str = (word1 (Word2|woRd3)) s = re.sub([^a-zA-Z0-9]+, ,str).split() -- Chris F.A. Johnson http://cfaj.freeshell.org == Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress http://www.torfree.net/~chris/books/cfaj/ssr.html -- http://mail.python.org/mailman/listinfo/python-list
Re: How do i read just the last line of a text file?
On Sun, 29 May 2005 at 04:42 GMT, nephish wrote: Hey there. i want to set a variable to represent the last line of a text file how do i do that? or even better, how do i create a list of the lines of a text file? from sys import argv ## Import argv from sys module file = open(argv[1]) ## Open the file given on the command line all_lines = file.readlines() ## Read all the lines last_line = all_lines[-1] ## Assign the last line -- Chris F.A. Johnson http://cfaj.freeshell.org == Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress http://www.torfree.net/~chris/books/cfaj/ssr.html -- http://mail.python.org/mailman/listinfo/python-list
