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Hi I have a question about Quiz 1 #5. Why do you need to insert the two lines at the bottom for the function to meet its specification? Check out my pastebin: http://pastebin.com/HJxRKWw0

MIT 6.00 Intro Computer Science (OCW)
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the problem is that when you set result = v1 both result and v1 refer to the same address in memory - if you modify result, you also modify v1, but you are told not to modify the inputs. to avoid doing this, a copy of v1 and v2 is made: v1 = v1[:] v2 = v2[:] these are assigned new addresses in memory distinct from the v1 and v2 in the function call addVectors(v1,v2). (this would be clearer had he given them new names - w1 = v1[:] but maybe that's his point...)
Thanks snark exactly what I was looking for.

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