Windows 7, Python 3.4.3 This code snippet is "Example 7-13" on page 383 from "Programming Python, 4th ed." by Mark Lutz :
import sys from tkinter import * widget = Button(None, text='Hello event world!', command=(lambda: print('Hello lambda world!') or sys.exit())) widget.pack() widget.mainloop() My question is about the lambda expression. The author states "...this version uses an or operator to force two expressions to be run..." I am not understanding how 'or' causes this to happen. I guess I am expecting the 'or' to result only in the print running without executing sys.exit(). But that is not what happens--of course. I tried substituting 'and' for 'or', but this results in only the print being run! Obviously I have a significant misunderstanding of what is going on. Thanks! -- boB _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor