there is a code:
#coding:utf-8
from Tkinter import *
from sys import stdout, exit # lambda generates a function
widget = Button(None, # but contains just an expression
text='Hello event world',
command=(lambda: stdout.write('Hello lambda world\n') or exit()) )
widget.pack()
widget.mainloop()
when you click the button,there is output : Hello lambda world, then exit the
program.
i am confused, why not use "and" ? i made a try, if i use "or",the program
will not exit ,why?
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