On 26/06/2016 16:41, MRAB wrote:
On 2016-06-26 11:48, BartC wrote:
However, why couldn't Python have used "=" both for assignment, and for
equality? Since I understand assignment ops can't appear in expressions.
[snip]
Python supports chained assignments. For example, "a = b = 0" assigns 0
to both a and b.
I'm not sure how common it is, though. I virtually never use it myself.
Well, if it's allowed, then it doesn't matter how common it is.
So "=" couldn't be used with a different meaning inside expressions as
it would make this ambiguous.
It also raises the possibility of a bug when someone intends to write
"a=b==0" but writes "a=b=c" instead.
In that case I would have supported the use of ":=" for assignment.
--
Bartc
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