itertools.zip_longest； next()；普通函数 共三类阅读文本速度比较 | python 如何一次读两行文本

# -*- coding: utf-8 -*-
"""
Created on Sun Mar  4 11:12:50 2018

@author: 23712
"""
import time
import itertools

start1=time.clock()
List1=[]

with open('AntiGN.txt') as f:
  for line1 in f:
    line2=next(f)
    List1.append(line2)
print('time1 used',time.clock()-start1)
    

start2=time.clock()
List2=[]
with open('AntiGN.txt') as f:
  for line1,line2 in itertools.zip_longest(*[f]*2):
    List2.append(line2)
print('time2 used',time.clock()-start2)

start3=time.clock()
List3=[]
with open('AntiGN.txt') as f:
  while True:
    line1=f.readline()
    line2=f.readline()
    if not line2:break
    List3.append(line2)
print('time3 used',time.clock()-start3)

输出结果：

可见迭代器就是要快。建议大家以后都有迭代器吧。

ps：上述代码顺便解决了一次阅读两行文本的问题