On 05/21/2015 05:28 PM, Greg Ewing wrote:
Ethan Furman wrote:
I think the key difference is that the AST is not going to be
converted to run different Python code under Python, but under
some other language -- presumably to implement the semantics of
the Python snippet.
If the semantics were exactly the same as the Python
snippet, there would be no need to convert it to another
language -- you might as well just run the Python
code as-is.
Going back to the OP:
Context: PonyORM (http://ponyorm.com/) allows you to write regular
Python generator expressions like this:
select(c for c in Customer if sum(c.orders.price) > 1000)
which compile into and run SQL like this:
SELECT "c"."id"
FROM "Customer" "c"
LEFT JOIN "Order" "order-1" ON "c"."id" = "order-1"."customer"
GROUP BY "c"."id"
HAVING coalesce(SUM("order-1"."total_price"), 0) > 1000
That last code is /not/ Python. ;)
--
~Ethan~
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