import tkinter as tk
from idlelib.configdialog import ConfigDialog
from idlelib import macosx

class FunkyPatch:
    def __init__(self, target_exp, replace_exp, locals):
        self.target_exp = target_exp
        self.replace_exp = replace_exp
        self.locals = locals
    def __enter__(self):
        self.target = eval(self.target_exp, {}, self.locals)
        self.replace = eval(self.replace_exp, {}, self.locals)
        exec(self.target_exp + ' = ' + self.replace_exp, {}, self.locals)
        self.replace.func = self.target  # So replace can call target
        return self.target, self.replace
    def __exit__(self, et, ev, tr):
        tarname = '_target_func_'
        self.locals[tarname] = self.target
        exec(self.target_exp + ' = ' + tarname, self.locals)
        del self.locals[tarname]
        del self.replace.func
        
def wrapsetup(self, master, cnf):
    wrapsetup.func(self, master, cnf)
    print(self.widgetName, self._w)

def wrapCPFT(self, locals=locals()):
    with FunkyPatch('tk.BaseWidget._setup', 'wrapsetup', locals):
        wrapCPFT.func(self)

root = tk.Tk()
macosx._initializeTkVariantTests(root)
with FunkyPatch('ConfigDialog.CreatePageFontTab', 'wrapCPFT', locals()):
    ConfigDialog(root)

#print('Setup func is now ', tk.BaseWidget._setup.__name__)