Bug in v1.5.2 Websucker GUI?

Anton Vredegoor anton at vredegoor.doge.nl
Wed Jun 11 23:52:51 CEST 2003


On 30 May 1999 21:06:10 -0500, dhfx at realtime.net (David Friedman)
wrote:

>   I'm running v1.5.2 on a Win95 box. I tried wsgui.py and got the
>following error message:
>  ...
>   File "C:\ ... \WSGUI.PY", line 165, in go
>     self.sucker.rootdir = os.path.dirname(
>      [  websucker.Sucker.savefilename(self.url)) ]
>   TypeError: unbound method must be called with class instance 1st arg
>
>(the part in [ ] didn't appear in the message - I added it from the code)
>
>The object-instance  self.sucker  is an instantiation of class SuckerThread,
>which is derived from class  Sucker  of the  websucker  code module. The
>SuckerThread  class includes a method  savefilename()  which overwrites
>the method in  websucker.Sucker  of the same name. Whoever coded  wsgui
>evidently wanted to use the method of the parent class, rather than the
>method of the derived class. What seems to be giving trouble is that the
>arg of  dirname()  is a class method, rather than a method of an instance
>of the class.
>
>Here's what I did: I defined a new method  savefilename1()  in  SuckerThread
>which just calls the  savefilename()  of the parent class:
>
>    def savefilename1(self, url):
>        return websucker.Sucker.savefilename(self, url)
>
>Then I changed the code at "line 165" to the following:
>
>            self.sucker.rootdir = os.path.dirname(
>                self.sucker.savefilename1(url))
>
>and now it works. Note that the arg "self" of  savefilename1()  in the line
>above is not needed, it's implicit. In fact, when I had it in, I got an
>error message that I had too many args!

Well, it's about four years later now and the specific code in
wsgui.py seems to be unchanged. I can perhaps add that it only happens
if something is entered in the directory entry box since that triggers
the traceback.

On Win98Se, Python23:

>d:\python23\pythonw -u wsgui.py
Exception in Tkinter callback
Traceback (most recent call last):
  File "D:\PYTHON23\lib\lib-tk\Tkinter.py", line 1337, in __call__
    return self.func(*args)
  File "wsgui.py", line 163, in go
    self.sucker.rootdir = os.path.dirname(
TypeError: unbound method savefilename() must be called with Sucker
instance as first argument (got App instance instead)
>Exit code: 0

I would be in favor of finally fixing this, unless it would result in
backwardly incompatible changes :-) 

Anton

---
nobody and ghosts from the past read comp.lang.python




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