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

Debugging ActiveX Control Events in wxPython/PythonWin
by Charles Medcoff Sept. 4, 2000

Sept. 4, 2000

I am attemping to create a window (wxWindow) that hosts an ActiveX control. I have not had any problems getting through the window/control creation process but my control subclass event handlers are never called. I've stepped (debugged) all the way thought wxPython and into the Control.HookOleEvent() method in the PythonWin activeX.py module. I have observed the successful search for event handler methods in my subclass. Where do I go from here to debug the problem? Here is the code ##import win32com.client from wxPython.wx import * g_rslinx = None if wxPlatform == '__WXMSW__': from wxPython.lib.activexwrapper import MakeActiveXClass import win32com.client.gencache try: rsWhoLibModule = win32com.client.gencache.EnsureModule ('{172C823C-7624-11D0-A1BF-0060B01A661C}', 0, 1, 0) except: raise ImportError("Can't load RSWho Type Library") # Class for event handling class PyRsWho(wxWindow): def OnEnter(self, Selection): print "OnEnter" def OnSelChanged(self, Selection): print "OnSelChangled" def OnClientMenuItemSelected(self, Path, MenuID): print "OnClientMenuItemSelected(self, Path, MenuID):" def OnRightClick(self, Path, ClientMenu): print "OnRightClick(self, Path, ClientMenu):" def OnDoubleClick(self, Selection): print "OnDoubleClick(self, Selection):" class App(wxApp): def OnInit(self): self.frame = wxFrame(NULL, -1, "Py RsPath", wxPoint(200,200), wxSize(400,400)) self.frame.Show(true) self.SetTopWindow(self.frame) rsWhoClass = MakeActiveXClass(rsWhoLibModule.RSWho, PyRsWho) self.rsWho = rsWhoClass(self.frame, -1, wxPoint(0,0), self.frame.GetClientSize()) return 1 app = App(0) app.MainLoop() I know the control works becase I've hosted it in C++ and VB. I've written nearly identical python code for hosting another control and have had no problems there. Suggestions? Regards, Chuck -- Charles Medcoff Senior Systems Engineer Pyramid Solutions 1850 Research Drive, Suite 300 Troy, MI 48083 Sent via Deja.com http://www.deja.com/ Before you buy.

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dont laugh
by Ken Mossman Sept. 4, 2000

Sept. 4, 2000

I have some JUNIOR staff and they are asking if there any CBT or multi-media courses for Python They are NEWBIES !!

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Augmented assignment again
by Rpoeland Rengelink Sept. 4, 2000

Sept. 4, 2000

Hi, Since I expect the following to be(come) a common problem with the introduction of augmented assignment in Python, I thought I'd put this up for review I've been working recently on wrapping an image manipulation library that only provides in-place arithmetic operators. I've tried to overload the normal arithmetic operators in terms of copies and augmented assignment operators with somewhat mixed results. The simplest implementation is of course: class Obj: ... def __add__(self, other): result = self.copy() return result+=other Unfortunatly, that means: >>> a = Obj(data1) >>> b = Obj(data2) >>> c = Obj(data3) >>> d = a+b+c is equivalent to >>> tmp = a.copy() >>> tmp+=b >>> tmp = tmp.copy() >>> tmp+=c >>> d = tmp (maybe I should've stopped here and just warn my users) while we would like this to be equivalent to. >>> tmp = a.copy() >>> tmp += b >>> tmp += c >>> d = tmp Note that the whole reason that the library only supplies in-place operations is because copies are horrendously expensive. My first attempt to solve this: class Obj: def __init__(self, data): ... self.is_temporary = 0 def __add__(self, other): if self.is_temporary: return self+=other else: result = self.copy() // expensive result.is_temporary = 1 return result+=other The above implementation works nicely in the sense that >>> d = a+b+c only results in one copy() operation. (a is copied, and b and c are subsequently added in-place). The problem is that d.is_temporary is now 1. Hence, subsequent expressions will behave unexpectedly. >>> e = (d-a)/(d-b) # e = d == '1'!! Hence, this implementation is wrong. I've solved this with the following hack def __add__(self): if self.is_temporary and self.is_named(): self.is_temporary = 0 if self.is_temporary: return self+=other else: result = self.copy() // expensive result.is_temporary = 1 return result+=other def is_named(self): try: raise "GetTraceback" except "GetTraceback": frame = sys.exc_info()[2].tb_frame while frame: for key, val in frame.f_locals.items(): if self == val and key != 'self': return 1 frame = frame.f_back return 0 That is: before any aritmhetic operation on a temporary object, check to see if that object has been named and change the is_temporary to 0 if this is the case. This seems to work, but I find it ugly (and I'm not entirely sure it is correct). What I would really like is something like: class Obj: ... def __assign__(self): self.is_temporary = 0 I.e., a function that's invoked whenever an instance is named Any thoughts/comments? Cheers, Roeland

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Re: FAQ
by pehr anderson Sept. 4, 2000

Sept. 4, 2000

Ho Ho! It's easy as pie, CGI works by calling shell scripts, which can tell the shell what program to use in their execution. #!/usr/bin/python should be the first line of your program. It looks like a comment but tells the shell to launch python to parse the rest. Read more about it in the introductory section in the CGI module /usr/lib/python1.5/cgi.py It is a good idea to get comfortable poking through the library code in python! This is one of the best ways to get true understanding, not just documentation on how to use, but also direct examples of good python form. -pehr matle wrote: > > Hello there > > Is there any FAQ or reference on setting up Python+Apache Web server. > I just discovered Python and would like to give it a try. > > How do i configure Apache (I'm on RH6.2) to recognize Python script > and is there any sample script to try on. My machine already came with > Python and sample, but just don't know how to use them > > Thanks > Matle

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SlickEdit Users......Python setup...
by Amir Mistric Sept. 2, 2000

Sept. 2, 2000

Can someone who uses Visual Slick Edit post config file for Python ??? Thanks Amir

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print without newline?
by noahspurrier＠my-deja.com Sept. 2, 2000

Sept. 2, 2000

Is there a way to print without the newline (carriage return or line feed)? This does not do what I want: print "Hello.", because it puts a space after the "Hello." So I've been doing this: sys.stdout.write ("Hello.") but this seems ugly, plus I have to import sys. Yours, Noah Sent via Deja.com http://www.deja.com/ Before you buy.

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RE: gratuitous new features in 2.0
by Mike Fletcher Sept. 2, 2000

Sept. 2, 2000

Afraid I'm not really finding the ">>" syntax very beautiful/clear/obvious either. It's recognisable to Unix and C++ people, but it's not a particularly obvious reference for non-C++ programmers or those not accustomed to using shell redirection. Of the alternates proposed, "to" (which has problems with not currently being a keyword, and thereby introducing some potential for code breakage, but is the most intuitive word) or "in" seem the clearest. That said. I'm one of those who don't see why this needs to be a syntax-level construct, a function would seem just as useful and readable (more readable than the >> syntax, at least), and doesn't introduce the cryptic symbols of the current PEP. Enjoy yourselves, Mike -----Original Message----- From: Robin Becker [mailto:robin@jessikat.fsnet.co.uk] Sent: Friday, August 25, 2000 3:25 AM To: python-list(a)python.org Subject: Re: gratuitous new features in 2.0 ... here here, I hate the >> construct, why not print in stderr items,.... print + stderr items,....... print[stderr] items,..... print to stderr items,..... ...

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JPthon, a viable alternative to Java???
by Colin Meeks Sept. 1, 2000

Sept. 1, 2000

While I'm learning Python, I was just wondering. Is JPython an alternative to Java. I mean can I write apps in JPython that work within web pages in the same way that java applets do??? Colin

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Problem with JPython!
by ARG3000 Sept. 1, 2000

Sept. 1, 2000

Running the following string "\nif 1.0 > 2.0:\n\tprint 1.0\nelse:\n\tprint 2.0\n" using org.python.util.PythonInterpreter exec I get result '2.0' printed to stdout. this is what I would expect Running the same string through eval it bombs. Is there anything I should be aware of that i'm doing wrong? I did a byte for byte comparison between the 'working' string which i'm declaring in class, and 'code' which i'm building from a file... working Code 10 10 105 105 102 102 32 32 49 49 46 46 48 48 32 32 62 62 32 32 50 50 46 46 48 48 58 58 10 10 9 9 112 112 114 114 105 105 110 110 116 116 32 32 49 49 46 46 48 48 10 10 101 101 108 108 115 115 101 101 58 58 10 10 9 9 112 112 114 114 105 105 110 110 116 116 32 32 50 50 46 46 48 48 10 10 Any pointers would be greatly appreciated, thanks!

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what happened to wxpython.org/wxwindows.org?
by Leonardo B. Lopes Sept. 1, 2000

Sept. 1, 2000

It's all in the subject... I have been unable to resolve the addresses for a couple of days now. Does anyone know what's going on? -- ======================================================================== Leonardo B. Lopes leo(a)iems.nwu.edu Ph.D. Student (847)491-8470 IEMS - Northwestern University http://www.iems.nwu.edu/~leo

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