def a(): # function must return something x = 10# 4 spaces y = 2 print(x,y) print(a) a() print(a()) def a(x,y): # @1.5 x = 1 y = 2 x = x + y print(x,y) # return x # return None return [x,y] print(a) print(a(1,2)+ a(3,4)) def a(x,y): # @1.5 x = 1 y = 2 x = x + y print(x,y) return x # return None # return [x,y] print(a) print(a(1,2)+ a(3,4)+a(5,6)) print(a(1,2)+ b(3,4)+a(5,6))