轉(zhuǎn)自 : 廖雪峰python教程
**這段程序使用了filter過濾器對(duì)素?cái)?shù)進(jìn)行篩選,令人驚訝的是用于篩選的序列是一個(gè)惰性序列**#!/usr/bin/env python3# -*- coding: utf-8 -*-"""Created on Sat Feb 4 21:01:44 2017@author: jyhkylin"""def _odd_iter(): n = 1 while True: n = n + 2 yield ndef _not_divisible(n): return lambda x: x % n > 0def PRimes(): yield 2 it = _odd_iter() # 初始序列 while True: n = next(it) # 返回序列的第一個(gè)數(shù) yield n it = filter(_not_divisible(n), it) # 構(gòu)造新序列for n in primes(): if n < 1000: print(n) else: break新聞熱點(diǎn)
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