for循环和嵌套for循环

Question

用于线在file2.splitlines（）： 用于升在file1.splitlines（）： 如果线路在升： 打印升

Answer 1

创建字典出在第二行的文件将是一个更快的解决方案，它将摆脱重复的太多：

from collections import defaultdict 

second_file = open('second.txt') 
second_file_dict = defaultdict(int) 
first_file_dict = defaultdict(int) 

for line in second_file: 
    second_file_dict[line.strip()] += 1 
second_file.close() 

first_file = open('first.txt') 
for line in first_file: 
    if line in second_file_dict and not in first_file_dict: 
     print line 
    first_file_dict[line.strip()] += 1   
first_file.close() 

Answer 2

print list(set(file2.splitlines()) & set(file1.splitlines()))