python实现用生成器实现可迭代对象的方法

#!/usr/bin/python3
class Number(object):
 def __init__(self, start, end):
 self.start = start
 self.end = end
 
 # 判断一个数字是否是素数
 def get_num(self, k):
 if k >= 2:
 for i in range(2, k):
 if k % i == 0:
 return False
 return True
 
 def __iter__(self):
 for k in range(self.start, self.end+1):
 if self.get_num(k):
 # 是素数yield出去
 yield k
 
if __name__ == '__main__':
 num = Number(2, 30)
 for i in num:
 print(i)