🌐 Mailman 3 March 2000 - Python-list - python.org

how to install numpy on win nt ?
by j vickroy March 2, 2000

March 2, 2000

hello, i have downloaded python-numpy-15_2.zip and Disutils-0_1_3.zip. could someone tell a python novice how to install numpy on a win nt platform. i saw no readme file in the numpy zip archive and do not know where to begin. thanks for your time

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whats a good book on python/c/c++ integration?
by Shaun Hogan March 2, 2000

March 2, 2000

can anyone recomend a good book that goes a bit in depth on python/c/c++ integration, embedding python and the like?

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Re: Object Databases
by Ulf Engström March 2, 2000

March 2, 2000

Andrew M. Kuchling wrote: >1) Buy an object database (Versant, Matisse, POET, etc.) Pro: many We're getting a Poet database in the coming days, and I'd like to work on it with Python. Has anyone done this? Is there an interface for the Poet? If anyone has, or at least have some pointers, I'd really apprechiate to hear about it:) Regards Ulf Engström

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runtime code loading
by Jp Calderone March 2, 2000

March 2, 2000

(First, I'm a realtive newbie to Python, so if this is dumb, please excuse me) I've got the following code and I can't figure out why it freezes at the marked line: def connectionMade(self, sock, addr): print 'Getting pObj...', pObj = self.bootstrapObjects['Player'] print 'Done\nGetting lObj...', lObj = self.bootstrapObjects['LoginParser'] print 'Done\nCreating player...' self.connections[addr] = pObj(lObj, sock, addr) # Freezes here print 'Done' pObj and lObj are loaded with this code: def load(name): infile = open('../lib/code/' + name, 'r') source = infile.readlines() result = compile(string.join(source, '\n'), '../lib/code/' + name, 'single' return result and the code files contain:" class Player: socket = None address = None def __init__(self, socket, addr): print 'Player init' self.socket = socket self.address = addr def hasData(self): return self.socket.ready() def parse(self): if not self.hasData(): return else: pass class LoginParser: state = -1 def __init__(self): self.state = 0 Anything obvious that I'm doing wrong (or am I approhacing this from completely the wrong angle?) Thanks in advance

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PythonWin and auto completion
by Charles Marais March 2, 2000

March 2, 2000

Hi All I've just installed python on a NT box (I'm new to python), and can't get the auto completion features (mentioned in Mark's book on p52-53) to work. Neither attribute expansion, nor call tips, nor autocompletion seems to work. What am I missing ? Please email. Thanks! -- ====================== Charles Marais chuckra(a)icon.co.za Mobile +27-82-890-1664 Phone +27 21 786 1644 ======================

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RE: Python and Windows Scripting Host
by Gaetan Corneau March 2, 2000

March 2, 2000

The idea is to be able to use any ActiveX Scripting compliant language in your application without change, and be able to use the same debugger for any language. For some applications, it's great. ______________________________________________________ Gaetan Corneau Software Developer Copernic Technologies inc. http://www.copernic.com E-mail: corg(a)copernic.com ______________________________________________________ "Tu l'as trop écrasé, César, ce Port Salut" > It's been a while since I looked at it, but I remember being > unimpressed. WSH looks to be more useful for more braindead languages. > It may offer python a little bit in GUI capabilities. > > Python's win32 stuff is great, and it has a very python feel to it.

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String printing behavior?
by ted.drain＠jpl.nasa.gov March 2, 2000

March 2, 2000

Hi all, I've got a question about the string printing behavior. If I define a functions as: >>> def foo(): ... return "line1\nline2" >>> foo() 'line1\013line2' >>> print foo() line1 line2 >>> It seems to me that the default printing behavior for strings should match behavior of the print routine. I realize that some people may want to see embedded control codes, but I would advocate a seperate method for printing raw byte sequences. We are using the python interactive prompt as a pseudo-matlab like user interface and the current printing behavior is very confusing to users. It also means that functions that return text (like help routines) must print the string rather than returning it. Returning the string is much more flexible because it allows the string to be captured easily and redirected. Any thoughts? Ted -- Ted Drain Jet Propulsion Laboratory Ted.Drain(a)jpl.nasa.gov

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Python Knowledge Base Update -- March 1st, 2000
by Nathan Wallace March 2, 2000

March 2, 2000

I've spent some time going back through newsgroup postings for the last couple of days to start building the knowledge base: http://python.faqts.com There are now 31 answers to 50 questions in the Python Knowledge Base. Please contribute and help build this resource. It's generally a good idea to post these summarized answers back to the newsgroup so people can see where their answers have been used, and correct any mistakes I've made. Sorry if you feel this post is inappropriate. Cheers, Nathan ## New Entries ################################################# ------------------------------------------------------------- Why can I run an executable program using "python prog.py" but not as "./prog.py"? http://www.faqts.com/knowledge-base/view.phtml/aid/1353 ------------------------------------------------------------- Nathan Wallace Michael Hudson The only thing I can think of is that the hash-bang line has some control characters or other gunk in it - have you tried `cat -v'-ing it? ------------------------------------------------------------- Are there any Python functions to help with linear algebra? What is numpy used for? http://www.faqts.com/knowledge-base/view.phtml/aid/1354 ------------------------------------------------------------- Nathan Wallace William Park, Gary Herron I'm looking for a module or a set of functions that does linear algebra, things like inverses, multiplication, eigenvalues, etc.. That would be Numeric Python, which is a wrapper around Fortran libraries, one of which does some matrix operations. It was recently made available on sourceforge: http://numpy.sourceforge.net/ ------------------------------------------------------------- How can I determine if a string is contained in a bigger string? How can I find the position of a substring in a string? http://www.faqts.com/knowledge-base/view.phtml/aid/1355 ------------------------------------------------------------- Nathan Wallace Fredrik Lundh if string.find(mystring, "foo") >= 0: ... or string.index(mystring, "foo") ... The latter raises a ValueError exception if the substring isn't found. For more info, see the "string" chapter in the library reference: http://www.python.org/doc/current/lib/module-string.html ------------------------------------------------------------- I'm new to Python, where should I start? Can you give me an overview of the Python Documentation? Do I need books to learn Python? http://www.faqts.com/knowledge-base/view.phtml/aid/1356 ------------------------------------------------------------- Nathan Wallace Tom Funk The handbook is part of the on-line documentation available at the Python web site and with the Python installation -- and it's free. You may not need to go to a bookstore if you peruse the following page: http://www.python.org/doc/ The tutorial is quite complete: http://www.python.org/doc/current/tut/tut.html If you work through the tutorial, it should carry you pretty far along in your quest. I found it to be *quite* useful. The Library Reference discusses the modules that ship with Python. http://www.python.org/doc/current/lib/lib.html The Language Reference is a bit more abstract, and *much* more dry. However, it does completely describe the core Python language constructs, grammar and syntax. It's often referred to as material for "Language Lawyers." http://www.python.org/doc/current/ref/ref.html I like the Module Index: http://www.python.org/doc/current/modindex.html It allows you to jump straight to the module of your choice. If you're using Win32 (as I do), then you may find the MS HTML Help version to be useful (it's my favorite). If you use Win32, you might want to check out: http://www.orgmf.com.ar/condor/pytstuff.html Best of all, these very complete works of non-fiction are FREE.... gotta love that! I own five Python books, but I still find myself referring back to the Python documentation regularly. ------------------------------------------------------------- How can I catch an error in re.compile? How can I test for a bad regular expression? http://www.faqts.com/knowledge-base/view.phtml/aid/1357 ------------------------------------------------------------- Nathan Wallace Fredrik Lundh Why not just compile a bad expression and see what happens? ;-) >>> re.compile("(") Traceback (innermost last): File "<stdin>", line 1, in ? File "C:\py152\lib\re.py", line 79, in compile code=pcre_compile(pattern, flags, groupindex) pcre.error: ('missing )', 1) (to catch the exception, use try/except re.error) ------------------------------------------------------------- How can I use a Microsoft Access database from Python? http://www.faqts.com/knowledge-base/view.phtml/aid/1359 ------------------------------------------------------------- Nathan Wallace Andy Robinson, Robert Roy This is well covered in our book "Python Programming for Win32" (O'Reilly 2000), and the examples can be downloaded from the book's page: http://starship.python.net/crew/mhammond/ppw32/ Also see: http://starship.python.net/crew/bwilk/access.html ------------------------------------------------------------- How can I choose an element from a list at random? http://www.faqts.com/knowledge-base/view.phtml/aid/1361 ------------------------------------------------------------- Nathan Wallace Bruce Wolk import random random.choice(list) ------------------------------------------------------------- Is there a extended library of Python functions for X windows? Can I track the X-Y co-ordinates of the mouse from Python even over other application windows? http://www.faqts.com/knowledge-base/view.phtml/aid/1362 ------------------------------------------------------------- Nathan Wallace Gerrit Holl, Sjoerd Mullender Sjoerd Mullender has done that. Parnassus links to his homepage http://www.cwi.nl/ftp/sjoerd/index.html for an extensive X library in Python. An update to this stuff is long overdue, but I have so little time to make that update... ------------------------------------------------------------- Where can I get a complete version history of Python? http://www.faqts.com/knowledge-base/view.phtml/aid/1363 ------------------------------------------------------------- Nathan Wallace Michael Hudson Misc/HISTORY in the source distribution has more than 200k of what you ask for; Misc/NEWS has the changes since 1.5.1. ------------------------------------------------------------- Where can I find a good simple example using threads in Python? http://www.faqts.com/knowledge-base/view.phtml/aid/1364 ------------------------------------------------------------- Nathan Wallace Jeff Blaine, Steve Holden Ripped straight from Aahz Maruch's post the other day and simplified as more of a 'visual learning tool' demo. Added a few comments... whatever...just posting in case someone finds this one more graspable at a thread-beginner level like me. #!/usr/local/bin/python import time, threading, whrandom class MyThread(threading.Thread): """ Each thread picks a 'random' integer between 0 and 19 and reports in once per second for that many seconds. """ def run(self): iterations = whrandom.randint(0, 19) for i in range(iterations): print " ", self.getName(), "is reporting in" time.sleep(1) print self.getName(), "is DONE" if __name__ == '__main__': threadList = [] # Create 5 MyThread() threads for i in range(5) : thread = MyThread() threadList.append(thread) # Start all threads for thread in threadList: thread.start() # As long as we have more than just the 'main' thread running, print # out a status message while threading.activeCount() > 1 : print str(threading.activeCount()), "threads running incl. main" time.sleep(1) Please note, you should not expect this to run under Idle, which gave somewhat incomprehensible results to a newbie like me, but it works fine as a standalone. ------------------------------------------------------------- Where can I get more information about books on Python? What are some good Python books? http://www.faqts.com/knowledge-base/view.phtml/aid/1368 ------------------------------------------------------------- Nathan Wallace Fredrik Lundh "Learning Python" and "The Quick Python Book" are probably your best bets at the moment. they're a bit different in style; you may wish to check them out in your local bookstore to see which one you prefer. You can more info via the page: http://www.python.org/psa/bookstore/ ------------------------------------------------------------- What does del do for an instance of a wrapped C++ class? Does del call the destructor of a wrapped C++ class? http://www.faqts.com/knowledge-base/view.phtml/aid/1369 ------------------------------------------------------------- Nathan Wallace Remco Gerlich For example, let's say 'my_object' is a instance of wrapped C++ class. >>del my_object All it's supposed to do is remove the name from the current namespace. _If_ nothing else is still referring to it, then it may be removed, and the destructor would be called then. You can't assume that 'del' will call your destructor. ------------------------------------------------------------- Can I get the variable name of an object instance? http://www.faqts.com/knowledge-base/view.phtml/aid/1370 ------------------------------------------------------------- Nathan Wallace Fredrik Lundh Sorry, you can't do that. Names are just names, not identities. Any object can have lots of different names, or none at all. an example: clown = Hello(1) bobo = clown # here, bobo and clown both point to # the same instance del clown # now, only bobo points to that instance mylist = [bobo] del bobo # and here, nobody points directly to the # instance. If you want to get the name of the class for an object instance, see here: http://www.faqts.com/knowledge-base/view.phtml/aid/1328/fid/242 ------------------------------------------------------------- How can I get the state of the other mouse buttons in the callback for a button1 event? How can I get the state of buttons and keys in an event instance? http://www.faqts.com/knowledge-base/view.phtml/aid/1371 ------------------------------------------------------------- Nathan Wallace Fredrik Lundh The event instance has a "state" member which reflects the state of modifier keys and mouse buttons. iirc, the relevant bitmasks are: Button1Mask = 1<<8 Button2Mask = 1<<9 Button3Mask = 1<<10 ------------------------------------------------------------- How do I use python code in ASP tags? http://www.faqts.com/knowledge-base/view.phtml/aid/1372 ------------------------------------------------------------- Nathan Wallace Tom Funk There are a couple of things you might want to check: That the Win32 Python Extensions are properly installed. Your Python version is 1.5.2. <%@Language=Python%> as the first executable line in the ASP file. Between the <% %> delimiters, leading spaces are important. For instance: <% import sys pyVersion = sys.version %> will work. Whereas <% import sys pyVersion = sys.version %> will fail. The interpreter doesn't like the leading spaces in front of import and pyVersion. Here's a sample ASP file that should work as-is (it works for me). Copy and paste it into an ASP file and execute it from your server. It should display the current Python version and a list of server environment variables. If this doesn't work, your Win32 Extensions installation may be hosed up. -----------[ copy after this line ]-------------- <%@Language=Python%> <html> <body> <% # NO leading spaces here indent = " " * 5 def emitEnv(): # leading spaces needed here... import os for key in os.environ.keys(): Response.Write("<br>%s<b>%s</b>=%s\n" % (indent, key, os.environ[key])) # again, NO leading spaces here import sys pyVersion = sys.version %> <h3>Current Python Version</h3> <p><%=indent + pyVersion%></p> <h3>Server Environment Variables</h3> <% # no leading spaces, yet again emitEnv() %> <body> <html> -----------[ copy before this line ]-------------- ------------------------------------------------------------- How can I convert a floating point number to a string? http://www.faqts.com/knowledge-base/view.phtml/aid/1373 ------------------------------------------------------------- Nathan Wallace Gerrit Holl, Carel Fellinger >>> str(1.5) '1.5' You can use the builtin 'str' function if you want to convert _anything_ to a string: not only integers, lists, and dictionairies, but also file objects and class instances. Please read the documentation for more information. If more control over the layout is needed you might use the "%" trickery like: >>> '%5.2f' % 123.4567 123.45 >>> '%5.2e' % 123.4567 1.23e+02 ------------------------------------------------------------- How can I run my Python programs in Windows? How can I setup Python file extensions on Windows? http://www.faqts.com/knowledge-base/view.phtml/aid/1374 ------------------------------------------------------------- Nathan Wallace Tom Funk, Fredrik Lundh, David C. Ullrich If you're running under Win32, you could download and install the Win32 Extensions: http://www.python.org/download/download_windows.html The installer will add the necessary registry entries to allow you to run a .py or .pyw file from a command line or from within Windows Explorer. Also, most IDE's (including IDLE, PythonWin, emacs, etc) have commands that run your Python program and displays the output. Otherwise, if you're using Windows with any non-Python aware editor, fire up a command window (aka MS-DOS prompt) and run the script from there. e.g: c:\mydir> python myscript.py If you want to add the file associations by hand it's not hard to make Windows understand what you want to do. Like you can make a file py.reg that looks like this: REGEDIT4 [HKEY_CLASSES_ROOT\.py] @="DUPythonFile" [HKEY_CLASSES_ROOT\DUPythonFile] @="DUPythonFile" [HKEY_CLASSES_ROOT\DUPythonFile\DefaultIcon] @="D:\\Python\\Py.ico" [HKEY_CLASSES_ROOT\DUPythonFile\shell] @="Edit" [HKEY_CLASSES_ROOT\DUPythonFile\shell\Edit] [HKEY_CLASSES_ROOT\DUPythonFile\shell\Edit\command] @="C:\\windows\\notepad.exe %1" [HKEY_CLASSES_ROOT\DUPythonFile\shell\Run(DOS)] [HKEY_CLASSES_ROOT\DUPythonFile\shell\Run(DOS)\command] @="d:\\python\\py.bat %1" [HKEY_CLASSES_ROOT\DUPythonFile\shell\Initialize Interpreter] [HKEY_CLASSES_ROOT\DUPythonFile\shell\Initialize Interpreter\command] @="d:\\python\\python.exe -i %1" [HKEY_CLASSES_ROOT\DUPythonFile\shell\PyWin(Edit)] [HKEY_CLASSES_ROOT\DUPythonFile\shell\PyWin(Edit)\command] @="d:\\Python\\Pythonwin\\pythonwin.exe /edit %1" [HKEY_CLASSES_ROOT\DUPythonFile\shell\PyWin(Run)] [HKEY_CLASSES_ROOT\DUPythonFile\shell\PyWin(Run)\command] @="d:\\Python\\Pythonwin\\pythonwin.exe /run %1" The REGEDIT4 should be the first line of the file. If you execute that file then *.py files will have associations just like on my machine here - if you edit the path names, etc then you get what you want. And you save the py.reg file, so when installing something changes the associations you re-merge the py.reg file and they're back the way you want. Very handy for fixing things when some new program thinks you want it to take over every file extension it can think of.

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Re: multi-arg append (was RE: will python 3000 break my code?)
by Daniel Berlin March 2, 2000

March 2, 2000

>>>>> "TP" == Tim Peters <tim_one(a)email.msn.com> writes: TP> [/F] TP> Now for the question: has anyone else <wink>? That is, in my TP> experience so far, checkappend.py has found all the cases that were TP> actually broken (verfied by running the fixed code under a Python TP> fiddled to raise an exception on multi-arg append). I've seen two cases, both were where a function was passed in as an argument, and then applied with some other arguments, and the function happened to be append on a list. >> ... calling professional programmers idiots is not okay. TP> That really depends on the professional programmer in question, right? TP> For example, I enjoy being called an idiot. See, it depends. I'm all for being called a complete idiot, but i won't settle for anything less than halfwit. TP> it's-amusing!-ly y'rs - tim | -- | http://www.python.org/mailman/listinfo/python-list

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Re: Splitting comp.lang.python
by rmeegan＠murlmail.com March 2, 2000

March 2, 2000

Greetings - I find it very hard to seperate the technical and non-technical aspects of c.l.py. For example, are newbie questions technical? What if the response brings up a technical aspect? Does the thread somehow move to the correct newsgroup? In what Tim would surely rate as no more than a <0.5 wink>, I propose that a more useful split would be to create a seperate newsgroup for messages that advocate the end of whitespace for block delimiting and the addition of functional programming features, along with John Skaller's explanations of the superiority of Viper (Vyper?) to Python. This split alone should remove roughly 42% of the postings in any given month. Your humble servant, - Robert > Hello, > > Quoting Fredrik Lundh <effbot(a)telia.com>, > > this month, comp.lang.python has seen nearly > > 50% more posts than any month before: > > > > http://www.egroups.com/group/python-list/info.html > > http://starship.python.net/crew/just/FindMailStats/ > > 4000 messages in 29 days is a lot. it's 138 messages a day. Previous > discussions on splitting c.l.py always ended up in jokes and just > disappeared; I want to resurrect an informal discussion on wheter > to split the newsgroup or not; an RFD should be posted, of course, > but IANAL: does anyone have time to create an RFD? > > I propose to split c.l.py in a technical part and a non-technical part. > > regards, > Gerrit. > > -- > Comparison Python GUI's: http://www.nl.linux.org/~gerrit/gui.html > Please comment! > > -- > http://www.python.org/mailman/listinfo/python-list

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