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>>> import tkinter, tkinter.font
>>> tk = tkinter.Tk()
>>> tkinter.font.nametofont("TkHeadingFont").measure("string")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/home/proj/python/cpython/Lib/tkinter/font.py", line 154, in measure
 return self._root.tk.getint(self._call("font", "measure", self.name, *args))
AttributeError: 'Font' object has no attribute '_root'
This appears to be broken by revision cb80dd82d3da, Issue 23880, which included this change at the end of the measure() method:
-return int(self._call("font", "measure", self.name, *args))
+return self._root.tk.getint(self._call("font", "measure", self.name, *args))
The Font class does not have a "_root" attribute.