🌐 Mailman 3 September 2016 - Python-list - python.org

Re: What's the best way to minimize the need of run time checks?
by Gregory Ewing Sept. 1, 2016

Sept. 1, 2016

Chris Angelico wrote: > You might have won the 100m dash, except that we couldn't verify your > velocity of locomotion without a... run time check. Badumtish. All is not lost. You just need to devise a type system capable of proving that his time is faster than any other runner in all possible races. -- Greg

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Re: [OT] Altair
by Gregory Ewing Sept. 1, 2016

Sept. 1, 2016

Grant Edwards wrote: > The file containing the list of coordinates generated by a CAD program > for holes in a circuit board is still often referred to as a "drill > tape". Yep, and we talk about "core" memory, use a "tape archive" program to produce compressed files, and have "drives" with no moving parts. Terminological fossils abound! (When I first heard the term "core" used to refer to RAM, I thought it just meant that it was a central part of the machine... until I realised it was actually talking about those little magnetic doughnuts!) (And I suppose a "core dump" is what would happen if any of the fragile little wires broke...) -- Greg

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Re: [OT] Altair
by Gregory Ewing Aug. 31, 2016

Aug. 31, 2016

Christopher Reimer wrote: > The first time I came across a paper tape reader when I > visited the university as a teenager in 1984. A CNC machine read the paper > tape to drill six holes in a piece of metal. I think that would have just been called NC (Numerical Control). CNC (Computer Numerical Control) is where a computer drives the machine directly. -- Greg

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Variables visibility for methods
by ast Aug. 31, 2016

Aug. 31, 2016

Hello I made few experiments about variables visibility for methods. class MyClass: a = 1 def test(self): print(a) obj = MyClass() obj.test() Traceback (most recent call last): File "<pyshell#16>", line 1, in <module> obj.test() File "<pyshell#7>", line 4, in test print(a) NameError: name 'a' is not defined =========== RESTART: Shell ============== a = 1 class MyClass: def test(self): print(a) obj = MyClass() obj.test() 1 So it seems that when an object's méthod is executed, variables in the scope outside the object's class can be read (2nd example), but not variables inside the class (1st example). For 1st example, I know that print(MyClass.a) or print(self.a) would have work. Any comments are welcome.

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