Hmm.. link broke. Is this right? https://www.google.com/url?sa=t&source=web&rct=j&url=https://homepages.cwi.nl/~storm/teaching/reader/Dijkstra68.pdf&ved=2ahUKEwi8lqHYqfDcAhXImOAKHeAzDmsQFjAEegQIBhAB&usg=AOvVaw1CZug_36-PbevItYXTb7SR
On Wed, Aug 15, 2018, 8:35 PM David Mertz <me...@gnosis.cx> wrote: > Goto considered harmful. > > > https://homepages.cwi.nl/~storm/teaching/reader/Dijkstra68.pdf&ved=2ahUKEwi8lqHYqfDcAhXImOAKHeAzDmsQFjAEegQIBhAB&usg=AOvVaw1CZug_36-PbevItYXTb7SR > > On Wed, Aug 15, 2018, 3:52 PM Jacob Solinsky <jacobsolin...@gmail.com> > wrote: > >> -Jumping to a function as opposed to calling a function >> >> When a function is jumped to, it inherits the variables in the caller’s >> local namespace and is free to modify them or add new local variables, >> unlike a normal function call, wherein the caller’s namespace is >> inaccesible. At present, the only way I know of to accomplish this is to >> bundle all variables in the caller method’s namespace as properties of the >> method’s instance and have the callee method modify those properties. >> Though it is easier to read code written this way, it resulted in a great >> deal of redundancy in the code I was writing. The task I was attempting to >> accomplish was approximately this: >> >> class Verb: >> def __init__(self, parameters): >> self.parameters = parameters >> def conjugate(self): >> #Using the parameters, chose an appropriate list of >> morphemes to prefix and suffix to the verb >> self.morphemelist = morphemelist >> for morpheme in self.morphemelist: >> morpheme.mutate() >> returnstring = ‘' >> for morpheme in self.morphemelist: >> returnstring = returnstring + morpheme.form >> returnstring = returnstring >> >> class Morpheme: >> def __init__(self, verb, form, precedingmorpheme, >> succeedingmorpheme): >> self.verb = verb >> self.form = form >> self.precedingmorpheme = precedingmorpheme >> self.succeedingmorpheme = succeedingmorpheme >> def mutate(self): >> #Using the verb’s parameters and the type and form of the >> preceding and succeeding morpheme, mutate this morpheme’s form so that >> #a correct verb form is produced >> self.form = newform >> >> class Ban(Morpheme): >> def __init__(self, verb, form): >> super().__init__(verb, ‘ban’) >> def mutate(self): >> #This morpheme has mutation logic unique to itself but >> with many similarities to the default morpheme’s mutation logic >> self.form = newform >> >> Each subclass of Morpheme has its own slightly different mutate method. >> Some subclasses of Morpheme needed to access and manipulate a great deal of >> information about the verb and their surroundings, while other subclasses’ >> mutate methods differed little from the default. Most of the variables >> manipulated by the mutate method are not used by any other methods of class >> Morpheme and thus should not be made properties of the attached instance. >> What I wish I were able to do is write many little methods that modify the >> same set of local variables and compose them together into a complete >> mutate method. This would be effectively equivalent to having the “jump to >> function” calls be replaced with the text in the function’s body, like a C >> language macrosubstitution, but without using anything like preprocessor >> directives. >> >> Let foo(a, b) be the syntax to call foo(a, b), and foo(a, b)% be the >> syntax to jump to foo(a, b) >> >> def foo(a): >> return a + c >> >> def bar(a, c): >> return foo(a) >> >> def bazz(a, c): >> return foo(a)% >> >> c = 5 >> >> call = bar(1, 3) >> >> jump = bazz(1, 3) >> >> >> After execution, call in the above code would be 6 and jump in the above >> code would be 4. >> >> >> _______________________________________________ >> Python-ideas mailing list >> Python-ideas@python.org >> https://mail.python.org/mailman/listinfo/python-ideas >> Code of Conduct: http://python.org/psf/codeofconduct/ >> >
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