error when using Pmw.BLT

[Yang]

On Oct 21, 12:13 pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2009-10-21 10:50 AM, Yang Yang wrote:
>
>
>
> > Hello,
>
> > I tried to follow the following code demonstrating the use of Pmw.BLT:
>
> >  >>> from Tkinter import *
> >  >>> import Pmw
> >  >>> master = Tk()
> >  >>> g = Pmw.Blt.Graph( master )
>
> > I got the following error message after I typed the last line:
>
> > Traceback (most recent call last):
> >   File "<stdin>", line 1, in <module>
> >   File "C:\Python26\lib\site-
> > packages\Pmw\Pmw_1_3\lib\PmwBlt.py", line
> > 260, in _
> > _init__
> >     Tkinter.Widget.__init__(self, master, _graphCommand, cnf, kw)
> >   File "C:\Python26\lib\lib-tk\Tkinter.py", line 1932, in __init__
> >     (widgetName, self._w) + extra + self._options(cnf))
> > _tkinter.TclError: invalid command name "::blt::graph
>
> > I am a newbie in python. Does anybody know what causes this error? I
> > am running python 2.6.3 under windows xp.
>
> You need to install BLT for Tcl. It is not a standard part of Tcl, and it is not
> included in the version of Tcl that comes bundled with Python.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
>   that is made terrible by our own mad attempt to interpret it as though it had
>   an underlying truth."
>    -- Umberto Eco

Thanks, Robert!

Here is another question on this. I am running Python 2.6.3 which uses
Tcl 8.5. I could not find the BLT binary source for Tcl 8.5. The
latest version is for Tcl 8.4. How could I install BLT? For example,
can I change the default Tcl version that Python has access to to some
older version?

Thanks!