On 19/06/2018 11:33, Steven D'Aprano wrote:
On Tue, 19 Jun 2018 10:19:15 +0100, Bart wrote:
* Swap(x,y) (evaluate each once unlike a,y=y,x)
Sigh. Really? You think x,y = y,x evaluates x and y twice?
Yes. Try:
count=0
def fn():
global count
count=count+1
return 1
a=[10,20,30,40]
b=[1,2,3,4]
a[1],b[fn()] = b[fn()],a[1]
print (a)
print (b)
print ("Count",count)
b[fn()] is evaluated twice.
(May reply to other points of yours and Chris' in a few days.)
--
bart
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