python class in __next__ usage

class A (): 
    DEF the __init __ (Self, B): 
        self.b, = B 
    # DEF the __iter __ (Self): # This function can be used to indicate the iteration flag, may be omitted 
    # return Self 
    DEF the __next __ (Self): 
        IF Self .B <10: 
            self.b, + 2 = self.b, 
        the else: 
            The raise the StopIteration 
        self.d self.b, + 10 = 
        return self.d 
    DEF K (Self): 
        self.b, = 500 * self.b, 
        return self.b, 
A = C (2) 
for I in Range (. 4): 
    Print (C .__ Next __ ()) # can be iterated this, it is possible to use loop statement 
print (cK ()) # can not iterative, it is not used loop