On 2011-05-30, at 20:52 , Benjamin Kaplan wrote: > On Mon, May 30, 2011 at 5:28 PM, Henry Olders <henry.old...@mcgill.ca> wrote: >> >> On 2011-05-29, at 4:30 , Henry Olders wrote: >> > > Python doesn't have true globals. When we say "global" what we mean is > "module or built-in". Also, consider this code > > from math import sin > def redundant_sin(x) : > return sin(x) > > In Python, everything is an object. That includes functions. By your > definition, that function would either have to be written as > def redundant_sin(sin, x) : > and you would have to pass the function in every time you wanted to > call it or have a "global sin" declaration in your function. And you > would need to do that for every single function that you call in your > function body. > I don't believe so. Within redundant_sin, x is local, so if I change x, it will not change any objects named x outside of the function. As far as sin is concerned, if it were passed to redundant_sin via the parameter list, then it would be local, but otherwise sin would be looked for in the function definition; if not found there, it would be looked for in the module, where it would be found. I am not suggesting any changes to how names are looked up or scoped.
Henry
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