python使用生成器实现可迭代对象

#!/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)