RE: jython and toString
toString() isn't supposed to be a static method. When you call
x.toString(), you're accessing x's non-static version of toString(), which
is inherited from Object.
-- Walt
ivansh ([EMAIL PROTECTED]) wrote:
For one java class (Hello) i use another (HelloPrinter) to build the
string representation of the first one. When i've tried to use this
from within jython, HelloPrinter.toString(hello) call gives results
like Object.toString() of hello has being called. The example below
shows this behaviour.
Could somebody explain this?
// Hello.java
package jythontest;
public class Hello {
private String name;
public Hello(String name)
{
this.name = name;
}
public String sayHello()
{
return Hello, +name;
}
}
// HelloPrinter.java
package jythontest;
public class HelloPrinter {
public static String toString(Hello h)
{
return h.sayHello();
}
public static String toMyString(Hello h)
{
return h.sayHello();
}
}
# calljava.py
from jythontest import *
h = Hello(theName)
print h
print HelloPrinter.toString(h)
print HelloPrinter.toMyString(h)
OUTPUT:
[EMAIL PROTECTED] // GOOD
[EMAIL PROTECTED] // WRONG
Hello, theName // GOOD
Jython 2.1 on java (JIT: null)
java version 1.5.0_03
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_03-b07)
Java HotSpot(TM) Server VM (build 1.5.0_03-b07, mixed mode)
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RE: (semi-troll): Is Jython development dead?
John Roth ([EMAIL PROTECTED]) wrote: I've had a couple of inquiries about Jython support in PyFIT, and I've had to say that it simply isn't supported. The latest point release requires Python 2.3, and 2.4 will be required in the next year or so. John Roth Python FIT Just last month, Sun hired Charles Nutter and Thomas Enebo to work on JRuby full-time. Can somebody with some street cred (like the PSF) do something to persuade Sun to support Jython the same way? -- Walt -- http://mail.python.org/mailman/listinfo/python-list
RE: Quote ? [was: John Bokma harassment]
Chris Uppal ([EMAIL PROTECTED]) wrote: Geoffrey Summerhayes wrote: After you kill Navarth, will it be nothing but gruff and deedle with a little wobbly to fill in the chinks? Where does that come from ? It sounds like a quote, and Navarth is a Jack Vance name (and /what/ a character), but I don't remember the rest of it occurring in Vance. Trullion: Alastor 2262, a planet with a collectivist, sort-of-communist government, a huge population, and a crumbling infrastructure -- 'gruff' and 'deedle' are sweet desserts much loved by the population. I think all three of the Alastor novels have been collected in a single volume... [click click click...] Yep, ISBN 0312869525. Classic Jack Vance, and well worth reading. -- Walt -- http://mail.python.org/mailman/listinfo/python-list
RE: Writing an OPC client with Python ?
Larry Bates wrote: pierlau wrote: I use an OPC server for connection to DC Drive. I would like to write a small OPC client. I have the dll OPCDAAuto.dll which contains all class and method but I wonder if its possible to instance in python the class that are in the dll ? You can call methods/functions in a .dll using ctypes. http://starship.python.net/crew/theller/ctypes/ If all you want to do is *read* data from the OPC server, there's OPC XML-DA, an XML-based access method for OPC data. It should be possible to access OPC data using a SOAP library. Warning: Some OPC servers don't support the XML-DA protocol.) I haven't seen XML-DA done in Python yet (I've been meaning to write a Python proof-of-concept for a year or more), but implementations in other languages can be found via Google. In case anybody's wondering, OPC is OLE for Process Control, the alleged 'open' standard for interfacing instruments and controls to HMI, SCADA, and MES systems in industrial environments. Microsoft's sponsorship of the OPC Foundation was a brilliant piece of anti-competitive marketing; all of the control system vendors have now standardized on OPC, and it's essentially impossible to deploy any process monitoring or control computer that doesn't speak OLE (i.e., that doesn't run Windows). (And, yes, I think it's idiotic for companies to build billions of dollars worth of new manufacturing facilities whose information infrastructures depend on a deprecated, single-vendor 'standard' like OLE. And who the heck wants a 'protocol' that isn't specified at the wire level, anyway?) -- Walt As long as you've lit one candle, you're allowed to curse the darkness. -- http://mail.python.org/mailman/listinfo/python-list
RE: New Python.org website ?
Martin Maney writes: From a quick look, the beta appears to commit the same error as every design (as opposed to usability) driven web site in the world: it makes the running text smaller than the user's default. It's as if they care more about how it looks than whether I can read it... The biggest flaw I've noticed is that the site's stylesheet displays 'visited' links the same color as 'unvisited' links, presumably to make the page look more professional to the PHBs. Unfortunately, this makes the site much less usable; see Jakob Nielsen's column at http://www.useit.com/alertbox/20040503.html for an explanation. -- Walt -- http://mail.python.org/mailman/listinfo/python-list
Re: Spelling mistakes!
Terry Hancock ([EMAIL PROTECTED]) writes: 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? That's a common spelling error, yes, but.. The number-one spelling error among today's semi-literates is writing it's for the third-person neuter possessive instead of its. (These folks frequently write her's instead of hers and who's instead of whose as well, but, strangely, hardly ever write hi's for the masculine form.) A native English speaker's spelling of its is a very accurate measure of his general literacy. [Gee, I hope their were no spelling misteaks inn that paragraph...] -- Walt -- http://mail.python.org/mailman/listinfo/python-list
RE: Problems programming with Tkinter
Svenglenn writes: But, i want the program to open a new dialogue when i press the button Visa ruta and in that dialogue will be a field where you can enter a value directly in the program, but a can't get it to work because is don't know how i shall do to open a new dialogue window in the program? For simple data entry (and file choosing, too!), use the built-in Tk dialogs. For example: .import tkSimpleDialog . .answer = tkSimpleDialog.askString( .Dialog title, .Prompt, .parent=root, .initialvalue=Howdy!) .if answer is not None: ....do something... -- Walt -- http://mail.python.org/mailman/listinfo/python-list
RE: The Industry choice
Paul Rubin writes: I don't know that C# is really that much different from Python. I haven't used it but I have the impression that it's sort of similar under the skin. Nope nope nope. C# is a statically typed, statically compiled (i.e., no eval(...) or exec(...)), single-inheritance langauge with a bondage-and-discipline syntax almost identical to Java's. It compiles to run on the Common Language Runtime, which is conceptually similar to the JVM. Other than some syntactic sugar, C#'s primary difference from the latest Java (v1.5) is that its standard libraries (the .Net stuff) are much poorer -- this is particularly noticeable in its Collections API. -- Walt -- http://mail.python.org/mailman/listinfo/python-list
RE: Is this a good use for lambda
Steven Bethard wrote: Charlie Taylor wrote: I have tried using named functions instead of using lambda functions, however, I always end up with a convoluted, hard to follow mess. ... Well, I think the jury could still be out on which version is more readable, but I don't understand the comment I have tried using named functions instead of using lambda functions, however, I always end up with a convoluted, hard to follow mess. If you know that: name = lambda *args, **kwds: expr is eqivalent to: def name(*args, **kwds): return expr then it's quite straightforward to translate from one to the other. I think that Charlie's point is that, when you use def name, you have name polluting your namespace. The whole program becomes harder to understand because you can't ignore name anywhere, even if it was only ever intended to be used in one place. It's a good point, and reasonable people can disagree about whether the namespace pollution or the unreadability of lambda is a bigger problem. I've used lambda from time to time, but only socially, and I can quit any time I want... -- Walt -- http://mail.python.org/mailman/listinfo/python-list
RE: example code sought
Sean McIlroy wrote: What I want to do is simply to move a shape around on the screen using the mouse. I've looked at Tkdnd.py but I can't seem to extract what I need from the more involved stuff in there. Here's a simple sample that displays random rectangles that can be dragged around a Canvas: =-=-=-=-=-=-=-=-=-= #!/usr/bin/python # dsimp.py -- test object dragging import sys import math import Tkinter import random class DragCanvas(Tkinter.Frame): A canvas containing 'nrect' random draggable rectangles. tilecolors = ( cyan, gold, lightgreen, green, darkgreen, lightblue, blue, darkblue, pink, red, ) def __init__(self,master,nrect=1): Create the Canvas and a bunch of rectangles. Tkinter.Frame.__init__(self,master) self.bbox = (0,0,600,400) self.master = master self.nrect = nrect self.rand = random.Random() self.dragging = 0 self.item = -1 self.xbase = 0 self.ybase = 0 self.xscroll = Tkinter.Scrollbar(self, orient=Tkinter.HORIZONTAL) self.yscroll = Tkinter.Scrollbar(self, orient=Tkinter.VERTICAL) self.xscroll.pack(side=Tkinter.BOTTOM,fill=Tkinter.X) self.yscroll.pack(side=Tkinter.RIGHT,fill=Tkinter.Y) self.world = Tkinter.Canvas(self, width=self.bbox[2], height=self.bbox[3], xscrollcommand=self.xscroll.set, yscrollcommand=self.yscroll.set, borderwidth=1, relief=Tkinter.GROOVE) self.xscroll.config(command=self.world.xview) self.yscroll.config(command=self.world.yview) self.world.pack(fill=Tkinter.BOTH) # Mouse commands for this view. self.world.bind(Button-1,self.__doimageClick) self.world.bind(ButtonRelease-1,self.__doimageUnclick) self.world.bind(B1-Motion,self.__doimageDrag) for i in range(0,self.nrect): # Compute graphics coordinates of tile. # (Note first row/col offset by 1 pixel from top/left.) xsize = self.rand.randrange(30,80) ysize = self.rand.randrange(20,50) x1 = self.rand.randrange(0,360) y1 = self.rand.randrange(0,260) # Create a random rectangle. rectnum = self.world.create_rectangle( x1,y1,x1+xsize,y1+ysize, fill=self.rand.choice(DragCanvas.tilecolors)) # Limit scrolling in the view. #self.world.config(scrollregion=self.world.bbox(Tkinter.ALL)) self.world.config(scrollregion=self.bbox) def __doimageClick(self,event): User clicked mouse; start dragging if item found. x = self.world.canvasx(event.x) y = self.world.canvasy(event.y) items = self.world.find_overlapping(x-2,y-2,x+2,y+2) if len(items) 0: self.dragging = 1 self.item = items[-1] # Topmost item is returned last. self.xbase = x self.ybase = y def __doimageUnclick(self,event): User released mouse; stop dragging. self.dragging = 0 self.item = -1 def __doimageDrag(self,event): Drag an item around the map. if not self.dragging: return x = self.world.canvasx(event.x) y = self.world.canvasy(event.y) self.world.move(self.item,x-self.xbase,y-self.ybase) self.xbase = x self.ybase = y def doexit(): Exit the program, discarding changes. sys.exit(0) root = Tkinter.Tk() root.geometry(400x300) root.title(Draggable?) mbar = Tkinter.Menu(root) root.config(menu=mbar) filemenu = Tkinter.Menu(mbar) mbar.add_cascade(label=File,menu=filemenu) filemenu.add_separator() filemenu.add_command(label=Exit,command=doexit) worldview = DragCanvas(root,12) worldview.pack() root.mainloop() -- http://mail.python.org/mailman/listinfo/python-list
