more arguments in comprehension lists [ for ... for ]

[compsystems]

Hi BP, in the future there will be support for more argument in comprehension lists [ for ... for ]

Code : Tout sélectionner

def double(x):
  return x*2 

[double(x) for x in range(10)] [enter] returns
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]

[double(x) for x in range(10) if x mod 2==0] [enter] returns
[0, 4, 8, 12, 16]


[x+y for x in [10,30,50] for y in [20,40,60]] [enter] Syntax Error
expected [30, 50, 70, 50, 70, 90, 70, 90, 110]

[parisse]

I can't, the parser does not accept this notation. Instead you can run
flatten([ [x+y for x in [10,30,50] ] for y in [20,40,60]] )

[compsystems]

Hello

Trying the following seems to be a error

purge(a,b,y);

Code : Tout sélectionner

list_a := [1, 2, three, y];
list_b := [2, 3, -4, y];
common_num := [];
for a in list_a:
  for b in list_b:
    if a == b:
      common_num.append(a)
common_num

> [2,y]

but

Code : Tout sélectionner

list_a := [1, 2, three, y];
list_b := [2, 3, -4, y];
common_num := mat2list([ [a for a in list_a] for b in list_b if a == b ]); 
common_num

> [ ]

[parisse]

why do you think there is an error?