[Python-Dev] Enable access to the AST for Python code
ethan at stoneleaf.us
Fri May 22 03:33:20 CEST 2015
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. ;)
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