【学习】使用生成函数实现可迭代对象

 1 class PrimeNumbers:
 2     def __init__(self,start,end):
 3         self.start = start
 4         self.end = end
 5         
 6     def isPrimeNum(self,k):
 7         if k < 2:
 8             return False
 9         for i in xrange(2,k):
10             if k % i == 0:
11                 return False
12         
13         return True
14         
15     def __iter__(self):
16         for k in xrange(self.start,self.end + 1):
17             if self.isPrimeNum(k):
18                 yield k
19                 
20 if __name__ == "__main__":
21     for x in PrimeNumbers(1,100):
22         print x