[Python-Dev] Simple Switch statementZ (original) (raw)

Ka-Ping Yee python-dev at zesty.ca
Mon Jun 26 01:12:07 CEST 2006

On Mon, 26 Jun 2006, Georg Brandl wrote:

Raymond Hettinger wrote: > five = 5 > eight = [8] > def f(x, six=6): > seven = 7 > a = static(five + 4) # this is legal > b = static(six + 4) # this is illegal > c = static(seven + 4) # this is illegal > d = static(eight + [4]) # this is illegal

Why would the last line be illegal?

I believe Raymond is assuming it would be illegal because it's mutable. I don't think much has been said about whether static() should be allowed to yield a mutable value, but if we did allow that, it might open up an avenue to much confusion. (I join the chorus of voices that dislike the name 'static' for this feature.)

Whether or not 'eight + [4]' is allowed in 'static', it certainly wouldn't be allowed after 'switch' or 'case' since it's unhashable.

-- ?!ng

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