The overall idea is to get each file first key, Then output the same to list in , Then the first file is made into dict, Traverse 1、2 File composed list, And then dict Of key contrast , If they are equal, the corresponding value #!/usr/bin/python import json file = '/Users/jian.wang13/code/test/wenjian1.txt' file2 = '/Users/jian.wang13/code/test/wenjian2.txt' wenjian1_list = [] with open(file,'r') as f: for i in f: tmp = i.split(' ') # print(type(tmp)) # print(tmp[0]) # print(type(tmp)) wenjian1_list.append(tmp[0]) print('###################################') wenjian2_list = [] with open(file2,'r') as f2: for j in f2: tmp = j.strip() wenjian2_list.append(tmp) xiangdeng_list = [] for i in wenjian1_list: for j in wenjian2_list: if i == j: xiangdeng_list.append(i) # print(i) print('@@@@@@@@@@@@@@@@@@@@@@@@@@') #str、lsit、dict Mutual conversion between wenjian3_list = [] with open(file,'r') as f3: for i in f3: tmp = i.split(' ') # d_tmp = json.loads(tmp) wenjian3_list.append(tmp[1]) #print(wenjian3_list) d = zip(wenjian1_list,wenjian3_list) #print(dict(d)) dict1 = dict(d) for i in xiangdeng_list: for j in dict1.keys(): if i == j: print(dict1[j])