The following code fragment works OK. Question: why?
#======================================
from Tkinter import *
root=Tk()
lbl=Label(root,text='1').pack()
def doIt():
lbl.config(bg="yellow")
btn=Button(root,text="do", bg="cyan",command=doIt).pack()
root.mainloop()
#=======================================
My question is: how is the instance lbl.config(...) recognized in the doIt
callback fn when called from the main w/o an argument referencing lbl?
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