KeyPress/KeyRelease binding: PCs v. MacOS

This subject came up on the DaniWeb Python discussion board,
and I was
curious about it:

(http://www.daniweb.com/techtalkforums/thread70746.html
)

The issue is an apparent difference between PCs and Macs in
interpreting key holds.  The following code:
---
from Tkinter import *

class MyFrame(Frame):

    def __init__(self, master):
        Frame.__init__(self, master)
        self.go = False

        self.bind('<a>', self.showJudgments)
        self.bind('<KeyRelease-a>', self.makeChoice)
        self.pack(expand=YES, fill=BOTH)
        self.focus_force()

    def showJudgments(self, event=None):
        if self.go == False:
            self.go = True
            self.showJudgmentsA()
        else: 
            self.keepShowing()
            
    def keepShowing(self):
        print 'a key being pressed'

    def showJudgmentsA(self):
        print "key-press started"

    def makeChoice(self, event=None):
        print "choice made"
        self.go = False


mainw = Tk()
mainw.f = MyFrame(mainw)
mainw.f.grid()
mainw.mainloop()
---
on a PC produces this output: 
---
key-press started       # pressed 'a' here
a key being pressed
a key being pressed
...
a key being pressed
choice made            # let go here
---
and on a Mac, this output:
---
key-press started
choice made
key-press started
choice made
key-press started
choice made
key-press started
choice made
---

Apparently, Macs interpret held keys as press/release,
press/release, ...

Is this correct?

Thanks,
Jeff



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