🌐 Mailman 3 July 2002 - Tutor - python.org

Backslashes inside of variable
by Phoebus Nov. 24, 2003

Nov. 24, 2003

I am running Python 2.2 on Win2k. I have a program which writes a filename, with backslashes to a file, along with other stuff. I read the file in using readlines() and put each line into a variable. My problem is I want to use the filename, but I can't use it because of the backslashes. I know about doing open(r"d:\test\file.txt","w") or even open(`d:\test\file.txt`,"w"), but the filename is inside of a variable so when I do open(filename,'w'), I have problems. Can anyone help? Thanks, Steve --

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FW: Embedding Python
by BELSEY, Dylan Dec. 5, 2002

Dec. 5, 2002

Hi Tutor list, I posted the below mail last week and haven't seen any replies on the topic so I am not sure if it got through or if the questions were out of the scope of this list. If it is out of scope, any suggestions to what list would be more appropriate. Further to the information provided, I compiled the code in "Release" mode and still obtained the same error. When I refer to error I mean the 'import site' failure message. I would appreciate any help on this. Thanks, Dylan > -----Original Message----- > From: BELSEY, Dylan > Sent: Wednesday, 24 July 2002 15:51 > To: tutor(a)python.org > Subject: Embedding Python > > Hi, > I am attempting to try and get the embedding of Python running on my > system (WinNT). I am using VC++ and I copied the code from "5.1 Very High > Level Embedding" within "Extending and Embedding the Python Interpreter" > from the Python docs. I have also installed the latest release of Python, > version 2.3a0. The code from the documentation is pasted below: > > #include <Python.h> > > int > main(int argc, char *argv[]) > { > Py_Initialize(); > PyRun_SimpleString("from time import time,ctime\n" > "print 'Today is',ctime(time())\n"); > Py_Finalize(); > return 0; > } > > It compiles OK but when I go to run it I get the following error: > > 'import site' failed; use -v for traceback > Today is Wed Jul 24 15:39:04 2002 > Press any key to continue > > Any ideas why this error is occurring. Has anyone seen this error > and if so why is it occurring? The code is compiled in debug mode so > maybe the error is an artefact of that?? I have noticed that when I put > the produced executable in the directory where python.exe lives I don't > get the error. Unfortunately I don't know enough about the guts of Python > to follow this discovery through. > Any help would be appreciated. > Dylan

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Planning out your program
by Britt A. Green Sept. 14, 2002

Sept. 14, 2002

I made a very crude little text adventure in Python a few months ago. However, as I began to add on functionality to it, it became apparent that a lot of the underlying code wasn't capable of being improved. The original code basically let one player walk amongst a dozen rooms and pick things up. To get it to do much more would mean a huge rewrite of what I'd already done. So I'm going to have a lot of free time this summer and want to write something a bit more complex. What would be the best way to plan out my code before I start writing? Britt -- "My mom says I'm cool."

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IOError exception handling
by Allyn Weaks Aug. 23, 2002

Aug. 23, 2002

Python 2.1 until I can get 2.2.1 installed properly (linux 7.1), but I'll also be using 2.0 on another (aix) server. Can one get a more detailed error back than IOError? I'm counting lines in files that may or may not exist, and if one doesn't exist, I can set the number of lines to zero and continue with the rest. But, if the file can't be opened because of any other problem, such as a permission error, I want it to bail with whatever error message is appropriate (preferably without handling each and every case.) def countlines(filename): try: f = open(filename, 'r') text = f.readlines() f.close() return len(text) except (file doesn't exist): return 0 Many thanks from a first instar pythonista... -- Allyn Weaks allyn(a)tardigrade.net Seattle, WA Sunset zone 5 Pacific NW Native Wildlife Gardening: http://www.tardigrade.org/natives/ "The benefit of even limited monopolies is too doubtful, to be opposed to that of their general suppression." Thomas Jefferson

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A few comparative perl/python questions
by Kyle Babich Aug. 23, 2002

Aug. 23, 2002

I just have a few Perl-to-Python questions: Does python have anything like Perl's || die, flock(), or seek() functions? (What are they?) If Python doesn't have something like flock(), what happens what multiple scripts are trying to write to one file at the same time? Thank you, -- Kyle

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Tkinter Editor
by Terje Johan Abrahamsen Aug. 21, 2002

Aug. 21, 2002

Hello, Does anyone know about a good editor for graphical Python creation? I would like to know if there is an editor that can help me create the code for boxes, pictures and so forth. Then I can paste that code into my own code, without having to write it. For example something along the lines of the object creator for VBA that comes with Excel. Preferably one that has somewhat more possibilities. However, just something that simple would also save me some time.. Thanks in advance, Terje _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com

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Use? Abuse? Amusement? Amendments?
by Gregor Lingl Aug. 20, 2002

Aug. 20, 2002

Hi! If you, incidentally, are going to have a coffee-break, please, run the code of the attachment. Your opinion? Gregor from __future__ import generators from turtle import * def ttree(t,l): if l > 12.0: t.forward(l) yield 1 t.left(25) for x in ttree(t, l * 0.65 ): yield x t.right(60) yield 1 for x in ttree(t, l * 0.52 ): yield x t.left(35) t.backward(l) yield 1 turtles = (leonardo, raphael, donatello) = (Pen(), Pen(), Pen()) for turtle in turtles: turtle.left(90) turtle.up() leonardo.goto(-100,-100) leonardo.color("red") raphael.goto( 0, -100) raphael.color("green") donatello.goto(100,-100) donatello.color("orange") for turtle in turtles: turtle.down() turtle.width(3) ltree = ttree(leonardo,79.0) rtree = ttree(raphael, 100.0) dtree = ttree(donatello, 66.0) done = 0 while done < 3: done = 0 for tree in (ltree, rtree, dtree): try: tree.next() except: done += 1 leonardo.up() leonardo.goto(-140,-135) leonardo.write("HOW CAN THIS BE DONE WITHOUT GENERATORS?") raw_input("Press Enter!")

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RE: [Tutor] Re: Why x+=y instead of x=x+y?
by alan.gauld＠bt.com Aug. 6, 2002

Aug. 6, 2002

> > in it I expect to be able to slow the loop down by changing > > x++ to x+=1 > > I cant get any of my compilers (Digital UNIX Compiler Driver 3.11 > and gcc) to compile (with -O0 to turn off all optimization) > i=i+1, i+=i and i++ differently. Interesting, I must go do some experimentation when I get into work tomorrow. It could be a change in the latest ANSI standard but I hope not, an awful lot of code relies on those differences! I'm particularly alarmed at i = i + 1 having the same behaviour since if i is a 'register' variable then that potentially changes the whole CPU semantics! > But they _are_ equivalent IIRC. > But I don't have a copy of the > Standard at hand to look it up *wink*. The last time I used raw C (as opposed to C++) was pre ANSI compilers(~1993/4), so the standard may have changed the rules. I'll check tomorrow... > Now I am really courious what compilers You use. The Sun Workbench, An HP EPROM programmer and the VAX VMS standard C compiler. Also occasionally the PSOS and OS/9 compilers. We also used gcc(v2.something) for one job cross compiling to a Texas Instruments chip (can't recall which!) so I'm interested to see gcc in your list. Alan G

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What file is calling the cgi ???
by runsun Aug. 3, 2002

Aug. 3, 2002

I have a cgi: /cgi-bin/py/whocalledme.py It was called by a shtml file "caller.shtml" as such:  The full path name of "caller.shtml" is: /testfolder/caller.shtml Now, what code should I put in the whocalledme.py such that its execution (when called by caller.shtml) displays the folder name ('testfolder') and the caller name ('caller.shtml') on a browser ??? Here were somethings I tried but they seem to offer the host info (namedly, /cgi-bin/py/whocalledme.py, but not /testfolder/caller.shtml) : print os.getcwd() print "<br>", os.environ.get("HTTP_REFERER", "--noreferer--") print "<br>", os.environ.get("HTTP_HOST", "--nohost--") print "<br>", os.curdir print "<br>", os.path.abspath(os.curdir) I could have used:  but I really want to see if a python cgi can get the caller's name. Thx in advance. pan ============================================ ~~ Be like water, be shapeless ~~ Runsun Pan, PhD, 773-834-3965 Ecology & Evolution, U of Chicago ============================================

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Problem - how to solve it ?
by A July 31, 2002

July 31, 2002

Hi, I have a program that I compiled( with Installer) into exe for using on Win32 systems. It works well on Windows Me, Windows 9x but on some computers with Windows 2000 it causes General Protection Error and the programs is finished. It would be nice if the program wrote a line number or something similar that could help a user find out which command caused that General Protection Error. Is there any solution for that? Thank you for help Ladislav

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