🌐 Mailman 3 October 2002 - Python-list - python.org

RE: Decimal arithmetic, with example code
by dougfort Oct. 1, 2002

Oct. 1, 2002

On Tue, 01 October 2002, Tim Peters wrote: <snip/> > suitable for all commercial applications, and I hope the FixedPoint project > finds a way to let users specify the rounding *their* app needs. <snip/> We're talking about a class method, or a mixin class in the constructor. Not too clear on this yet, because we want to get another release out with the initial set of proposed changes (__slots__, etc.), before we deal with it. We're also trying to accumulate test cases from c.l.p or wherever. We'd like to add a benchmark/rounding demo to the project. The more concrete examples proposed here and at fixedpoint.sourceforge.net, the better. Doug Fort <dougfort(a)dougfort.net> http://www.dougfort.net

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Re: inheritance problem
by Mike C. Fletcher Oct. 1, 2002

Oct. 1, 2002

super is a new feature in Python 2.2, it was created to make it possible to have mix-in classes where you don't _know_ what the super-class is. It also avoids some errors/maintenance work where base-classes changed names so that the sub-classes suddenly generated NameErrors. That said, it's only available in Python 2.2 and above, and although Python 2.2.x is the target for the current "stable" Python, it's not universally adopted yet, so code using super will not work on every Python installation (i.e. it won't work on Python 1.5.2 or 2.1). So, yes, it's better from a theoretical standpoint (it encodes the meaning of the call (call my super-class' method) explicitly ("explicit is better than implicit")), but in practical terms, if you are writing libraries that need to be backward compatible with old Pythons, then the explicit class-name approach is better. Also note, a number of people advocated the following approach with earlier Pythons: class B( A ): _super_b = A.b _super_a = A.a def b( self ): return self._super_b() + 'C' Which is more up-front work, but does make the inheritance and overloading of methods explicit in the code, which some people like :) . Personally, I've just moved to Python 2.2 for everything save PyOpenGL and SimpleParse and if people need to use the other modules, they need to upgrade, which lets me use all the neat 2.2 features :) . Enjoy, Mike gabor wrote: ... > > btw. "super(C,self).__init__()" is better than "A.__init(self)"? > or simply has the adventage that you don't have to specify the > superclass? > > thanks again, > gabor ...

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Scrolled list question
by mongo57a＠comcast.net Oct. 1, 2002

Oct. 1, 2002

Trying to make more than one data element appear in a scrolled list. The window is formed properly; the first piece of data is there, but I don't know how to get the rest of the data in (see comments in code below). if __name__ == '__main__': sqlcmd = sql.Build_Query (command, tables, columns, condition, sort) # custom code - works fine dbinfo = sql.Query (sqlcmd) #custom code works fine for i in range(20): symbol = dbinfo.Symbol[i] action = dbinfo.Action[i] dislist = string.join([symbol, action],' ') # joins the 2 strings ScrolledList(dislist) mainloop() class ScrolledList(Frame): def __init__(self, label, parent=None): Frame.__init__(self, parent) self.pack(expand=YES, fill=BOTH) # make me expandable self.makeWidgets(label) def handleList(self, event): index = self.listbox.curselection() # on list double-click label = self.listbox.get(index) # fetch selection text self.runCommand(label) # and call action here def makeWidgets(self,label): sbar = Scrollbar(self) list = Listbox(self, relief=SUNKEN) sbar.config(command=list.yview) # xlink sbar and list list.config(yscrollcommand=sbar.set) # move one moves other sbar.pack(side=RIGHT, fill=Y) # pack first=clip last list.pack(side=LEFT, expand=YES, fill=BOTH) # list clipped first The preceding puts the first value of dislist into the window - as it should. So how do I get the rest of them in there? I'm not a very experienced programmer...... tried dislist[i] with ScrolledList(dislist) and got errors. TIA. -----------== Posted via Newsfeed.Com - Uncensored Usenet News ==---------- http://www.newsfeed.com The #1 Newsgroup Service in the World! -----= Over 100,000 Newsgroups - Unlimited Fast Downloads - 19 Servers =-----

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py2exe, why tcl files???
by jubafre＠brturbo.com Oct. 1, 2002

Oct. 1, 2002

i have 5 modules imported: #mont.py import re from sre import * import __builtin__ from struct import * import py2exe # setup.py from distutils.core import setup import py2exe setup(name="re", scripts=["mont.py"], ) why py2exe create a tcl files??? my binary file have 5mb with tcl files, how can i take off tcl?? Juliano Freitas www.gebrasil.hpg.com.br

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Re: __call__ question
by aahz＠pythoncraft.com Oct. 1, 2002

Oct. 1, 2002

In article <mailman.1033487598.21842.python-list(a)python.org>, Rick Richardson <r.l.richardson(a)verizon.net> wrote: > >Your example gave me another variant that I should have tried but >didn't expect to work, that is adding the function to the Class, not >the instance :). It is interesting to note that the actual function >call works for either the instance or the class, but the shortcut only >works for the object if the assignment was made to the class. New-style classes only automatically call special methods if they're added to the class object. Old-style classes will work if you add special methods to the class or instance. -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ Project Vote Smart: http://www.vote-smart.org/

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Thread allready started ??
by Thomas Weholt Oct. 1, 2002

Oct. 1, 2002

I'm trying to create a TaskManager, starting a bunch of threads on given intervals. The problem is that I get an error "Thread allready started". This TaskManager is running inside a threaded webserver, so I don't know if this is the best way to have a set of tasks repeated over time on given intervals. If anybody has any pointers I'd appreciate it. Allready looking at recipies in the Python Cookbook, trying to hack one of these into something like the code below, which is failing by the way. NB! I want a Manager-thread starting/stopping sub-threads, not just a simple while loop. import threading, time class TaskManager(threading.Thread): def __init__(self, tasks): threading.Thread.__init__(self) self.tasks = tasks self.active = 1 self.wait = 5 def run(self): while self.active: for task in self.tasks: if task.doRun(): task.start() time.sleep(self.wait) if __name__ == '__main__': class T(threading.Thread): def __init__(self): threading.Thread.__init__(self) self.active = 1 def doRun(self): return 1 def run(self): print "GO :%s" % self._Thread__name threads = [] for i in range(0, 10): threads.append(T()) tm = TaskManager(threads) tm.start() tm.join() print "Main thread is ", tm.isAlive()

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ANN: Python User Group for St. Louis, MO
by Patrick K. O'Brien Oct. 1, 2002

Oct. 1, 2002

There is a new St. Louis Python User Group now forming, and we already have a website, mailing lists, SourceForge project, and more. If you live in the St. Louis, Missouri area and have any interest in using or learning Python, Jython or Zope, feel free to join us at http://www.pystl.org/. Pat -- Patrick K. O'Brien Orbtech ----------------------------------------------- "Your source for Python programming expertise." ----------------------------------------------- Web: http://www.orbtech.com/web/pobrien/ Blog: http://www.orbtech.com/blog/pobrien/ Wiki: http://www.orbtech.com/wiki/PatrickOBrien -----------------------------------------------

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Re: print images '*.tif'
by Chris Liechti Oct. 1, 2002

Oct. 1, 2002

"Janos Ponusz" <jponusz(a)hotmail.com> wrote in news:mailman.1033471032.16271.python-list@python.org: > does somebody have experience with printing *.tif images with python. nope. but have you looked at PIL (python imaging library) you can load manipulate and view images. maybe it has printing support too? and wxWindows/wxPython can load a number of image formats. it has a printing framework that works, i've used it in one app to print barcodes :) chris -- Chris <cliechti(a)gmx.net>

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file open verification
by python473＠yahoo.com Oct. 1, 2002

Oct. 1, 2002

Two questions - somewhat related: Situation - I have several files on an apache server that are being accessed by python programs that are receiving data from html forms. q1: How can the status of a file be checked? If two forms have been submitted and the data is being added to a common file, how do I know that data from both forms are being written correctly to the common file? q2: Related to above - really more of a cgi question - does the apache server keep all these file accesses separate some way?

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how to convert all warnings to errors?
by Skip Montanaro Oct. 1, 2002

Oct. 1, 2002

I thought there was a simple command line flag to turn warnings into errors, but I can't seem to find it. Pointers? Thanks, -- Skip Montanaro - skip(a)pobox.com "Airplanes don't fly until the paperwork equals the weight of the aircraft. Same with i18N." - from the "Perl, Unicode and i18N FAQ"

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