Can global variable be passed into Python function?
breamoreboy at yahoo.co.uk
Sat Mar 1 02:07:33 CET 2014
On 01/03/2014 00:40, Ned Batchelder wrote:
> On 2/28/14 6:36 PM, Mark H. Harris wrote:
>> On Friday, February 28, 2014 3:03:25 PM UTC-6, Marko Rauhamaa wrote:
>> ... and between me and you, here is a snip from dmath.py from the
>> atan(x) function:
>> if (n**2 < D(1)):
>> a = __atan__(n)
>> elif (n == D(1)):
>> a = gpi/4
>> elif (n == D(-1)):
>> a = -(gpi/4)
>> elif (n < D(-1)):
>> a = __atan__Lt_neg1__(n)
>> a = __atan__Gt_1__(n)
>> This if--elif--else is not only ugly, its just not readable
>> either, and besides that, its not elegant, nor is it humanly
>> helpful... its does work though, and its absolutely necessary. ugh.
>> First, its not immediately clear what it does. Well, there isn't
>> just one atan(x) routine, there are at least four of them, depending
>> on whether you're a purist, and they must be selected.
>> Second, because of the strict intent ideology of python in the
>> first place, I can't indent this code to make it more readable without
>> breaking python's syntax.
>> Third, this is a VERY simple if elif block. More complex ones are
>> much worse... for human reading that is...
>> I know its a pain in the neck, but python does need a switch
>> statement. Is it a stubborn question? I don't really think that
>> almost every modern computer language has a switch block because of
>> some C paradigm. I think its because most coders find them useful, at
>> least readable, and therefore essential.
> I don't understand: you show an if/elif chain that cannot be expressed
> as a switch statement (because it uses < ), and then conclude that
> Python needs a switch statement? That doesn't make any sense.
What a sneaky trick, trying to confuse people here with mere *FACTS* :)
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
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