One way to get a handle on some Tcl variables from Python is to create Tkinter.Variable instances with the names of the existing Tcl variables (normally, the variable names are chosen arbitrarily). Once you've done this, you can do things like add variable traces (the trace_variable method) on the Python side. One thing to be aware of is that the Python object's __del__ will unset the variable on the Tcl side. Also, this code sets an initial value for the variable which may or may not be appropriate in your application.
The code below was ripped from a larger application, so it may or may
not work without modification.
Jeff
# This code is in the public domain
from Tkinter import *
def makevar(master, name, klass, *default):
self = newinstance(klass)
self._master = master
self._tk = master.tk
self._name = name
if default:
self.set(default[0])
else:
self.set(self._default)
return self
def makebool(master, name, *default):
return makevar(master, name, Tkinter.BooleanVar, *default)
def makeint(master, name, *default):
return makevar(master, name, Tkinter.IntVar, *default)
def makefloat(master, name, *default):
return makevar(master, name, Tkinter.DoubleVar, *default)
def makestring(master, name, *default):
return makevar(master, name, Tkinter.StringVar, *default)
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