On 24 July 2018 at 08:38, Grégory Lielens <gregory.lielens@gmail.com> wrote:
On Tuesday, July 24, 2018 at 9:28:02 AM UTC+2, Brice Parent wrote:
Le 24/07/2018 à 00:39, Chris Angelico a écrit :
On Tue, Jul 24, 2018 at 8:22 AM, Thomas Jollans <tj...@tjol.eu> wrote: ... What about:
5 < x < 10
Can you add parentheses to that to "make precedence and evaluation order clear"? Correct me if I'm wrong, but to my knowledge, this is just a shorthand to `5 < x and x < 10`.
I learned something here:
-5<-2<-1<=-1>-3 True
I wonder how this works, especially as < and friends have magical __ methods... How is it expanded in tne AST?
import ast m = ast.parse('-5<-2<-1<=-1>-3') ast.dump(m) 'Module(body=[Expr(value=Compare(left=UnaryOp(op=USub(), operand=Num(n=5)), ops=[Lt(), Lt(), LtE(), Gt()], comparators=[UnaryOp(op=USub(), operand=Num(n=2)), UnaryOp(op=USub(), operand=Num(n=1)), UnaryOp(op=USub(), operand=Num(n=1)), UnaryOp(op=USub(), operand=Num(n=3))]))])'
Looks like there's a Compare node that takes a list of operators - and indeed the docs say (at https://docs.python.org/3.7/library/ast.html#abstract-grammar) Compare(expr left, cmpop* ops, expr* comparators) Paul