Python implements a method to implement iterable objects using generators

This article mainly introduces in detail how python uses generators to implement iterable objects. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

Case analysis:                                                                                                                                                                                                                                (1, 30)

for k in pn:

print(k)

The result is: 2,3,5,7,11,13,17,19 ,23,29

Implement the __iter__ method of this class into a generator function, and return a prime number each time yield

#!/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)

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