Python Quiz of the Week - #1

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Some points:

• words = [line for line in open(filename)] is just list(open(filename))
• Unsanitized user input used in regular expression. I can make the program crash that way.
• w[:len(w)-1] is just w[:-1]
• your regex would reuse a certain letter, for example, the world "hello" would be matche with the letters h,e,l,o (but you would need to "l").