查找两条线共同的元素，从两个文件

Question

我有两个标签，delimted大文件，

1)Bmag0905 chr7B 401656584 401656568 
Bmag0905 chr7A 459876086 459876070 
Bmag0904 chr2B 472060312 472060296 
Bmag0904 chr2A 373596126 373596110 
Bmag0904 chr7B 401656584 401656568 

2)Bmag0905 chr7B 172039378 172039358 
Bmag0905 chr4B 186310411 186310431 
Bmag0904 chr4B 532339252 532339232 
Bmag0904 chr2B 708832397 708832377 
Bmag0904 chr3A 673781330 673781350 

我想这是常见的无论是在第一和第二线的元素。所以，我的输出会是这样，

Bmag0905 chr7B 401656584 401656568 Bmag0905 chr7B 172039378 172039358 
Bmag0904 chr2B 472060312 472060296 Bmag0904 chr2B 708832397 708832377 

所以，这就是我如何创建一个字典，现在的问题是如何将所需的行发现类似上面和打印的常见元素在一个新的文件？另外，我应该按元素[0]分组吗？使用一对前两个列中的值作为键的基于

fileA = open("input1.txt",'r') 
fileB = open("input2.txt",'r') 
output = open("shared",'w') 
dictA = {} 
for line1 in fileA: 
    new_list=line1.rstrip('\n').split('\t') 
    query=new_list[0] 
    subject=new_list[1] 
    dictA.setdefault((query), []).append(subject) 
dictB = {} 
for line1 in fileB: 
    new_list=line1.rstrip('\n').split('\t') 
    query=new_list[0] 
    subject=new_list[1] 
    dictB.setdefault((query), []).append(subject) 
Shared ={} 
for id1, value1 in dictA.items(): (?) 
    if id1 in dictB.keys():(?) 

Answer 1

一些

和csvset溶液。我把它从你的样品输入/输出中的共性是基于TE前两列：

import csv 

read_a = csv.reader(filaA, delimiter='\t') 
read_b = csv.reader(filaB, delimiter='\t') 

dict_a = {tuple(row[:2]): row for row in read_a} 
dict_b = {tuple(row[:2]): row for row in read_b} 

shared_keys = set(dict_a) & set(dict_b) # intersection of keys 

writer = csv.writer(open('file.csv', 'w'), delimiter='\t') 
writer.writerows(dict_a[k] + dict_b[k] for k in shared_keys)