On Tue, Aug 14, 2018 at 10:25 AM, David Mertz
Great work! There are a few typos, I'll try to get to a PR on those.
I wonder if it's worth noting that None is a singleton, while 42 is just a value. I.e. there might be several distinct objects that happen to be the int 42, but not so with None.
very much worth nothing -- and I think re-wording that example. The fact that you can't assign to None is orthogonal to the fact that it's immutable. in fact, [42] is a llteral for a list with one element, the integer with the value of 42 in it. It is very much a mutable. and yet: In [7]: [42] = 34 File "<ipython-input-7-b919f2b4d30d>", line 1 [42] = 34 SyntaxError: can't assign to literal whereas: [5].append(3) works -- at least it does not result in an error -- even though it's useless. And the reason this matters is that name binding (and rebinding) is very much a different operation than mutating -- we should not conflate those. -CHB -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception Chris.Barker@noaa.gov