On 2017-06-30 09:43 AM, Steven D'Aprano wrote:
On Fri, Jun 30, 2017 at 12:51:26PM +0100, Jamie Willis wrote:
Just as an aside, if a concatenation operator *was* included, a suitable
operator would be "++",
As mentioned earlier in this thread, that is not possible in Python as
syntactically `x ++ y` would be parsed as `x + (+y)` (the plus binary
operator followed by the plus unary operator).
this is the concatenation operator in languages
like Haskell (for strings) and the majority of Scala cases. Alternatively
"<>" is an alternative, being the monoidal append operator in Haskell,
which retains a certain similarly.
"<>" is familiar to many people as "not equal" in various programming
languages, including older versions of Python. I'm not entirely sure
what connection "<>" has to append, it seems pretty arbitrary to me,
although in fairness nearly all operators are arbitrary symbols if you
go back far enough.
|| is the mathematical notation for concatenation. Which, just so
happens to be available in Python, even if it might be confused with
short-circuiting `or`.
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