why i cant solve this:
https://py.checkio.org/mission/boolean-algebra/

with my code

def boolean(x, y, operation):
if operation is "conjunction":
return 1 if x == 1 and y == 1 else 0
if operation is "disjunction":
return 0 if x == 0 and y == 0 else 1
if operation is "implication":
return 0 if x == 1 and y == 0 else 1
if operation is "exclusive":
return 0 if (x == 1 and y == 1) or (x == 0 and y == 0) else 1
if operation is "equivalence":
return 1 if (x == 1 and y == 1) or (x == 0 and y == 0) else 0

checker send me message:
Your result:None
Right result:0
Fail:boolean(0,0,"conjunction")

Created at: June 12, 2019, 6:23 p.m.; Updated at: June 12, 2019, 11:44 p.m.

The question is resolved.