python3中 for line1 in f1.readlines():，for line1 in f1:，循环读取一个文件夹

 1 #-*- encoding:utf-8 -*-
 2
 3 class loadDatas(object):
 4     def __init__(self):
 5         self.path=‘./data‘
 6     def load_compare(self):
 7         l1={}
 8         f1=open(self.path+‘/95b.txt‘,encoding=‘utf-8‘)
 9         l2={}
10         f2=open(self.path+‘/05b.txt‘,encoding=‘utf-8‘)
11         f=open(self.path+‘/1.txt‘,‘a‘)
12         # w2=open(‘./data/1.txt‘,‘a‘)
13
14             # flag=1
15         str1=[]
16         # print(type(str1))
17         for line2 in f2.readlines():
18
19             (tag2,name)=line2.strip().split("  ")
20             flag=0
21             for line1 in f1.readlines():
22                 (tag1,name)=line1.strip().split("  ")
23                 print(tag1)
24                 if tag2==tag1:
25                     print("a")
26                     flag=0
27                     break
28                 else:
29                     print(‘d‘)
30                     flag=1
31                     # break
32             # print("aa")
33             if flag==1:
34                 # print("aa")
35                 str1.append(line2)
36         print(str1)
37         f.writelines(str1)
38
39         f1.close()
40         f2.close()
41         f.close()
42
43 if __name__==‘__main__‘:
44     ld=loadDatas()
45     ld.load_compare()

结果：

ADR
a
[]
[Finished in 0.2s]

循环读取一个文件：

f1.seek(0)

 1 #-*- encoding:utf-8 -*-
 2
 3 class loadDatas(object):
 4     def __init__(self):
 5         self.path=‘./data‘
 6     def load_compare(self):
 7         l1={}
 8         f1=open(self.path+‘/95b.txt‘,encoding=‘utf-8‘)
 9         l2={}
10         f2=open(self.path+‘/05b.txt‘,encoding=‘utf-8‘)
11         f=open(self.path+‘/1.txt‘,‘a‘)
12         # w2=open(‘./data/1.txt‘,‘a‘)
13
14             # flag=1
15         str1=[]
16         # print(type(str1))
17         # int i
18         for line2 in f2:
19             print(line2)
20             (tag2,name)=line2.strip().split("  ")
21             flag=0
22             for line1 in f1:
23             # 读完一次循环后，line1已经到底了，第2次循环便不进入;
24             # f1.readlines()只能进入一次，一次读取整个文件;
25
26                 (tag1,name)=line1.strip().split("  ")
27                 print(tag1)
28                 if tag2==tag1:
29                     print("a")
30                     flag=0
31                     break
32                 else:
33                     print(‘d‘)
34                     flag=1
35                     # break
36             # print("aa")
37             if flag==1:
38                 # print("aa")
39                 str1.append(line2)
40             f1.seek(0)
41         print(str1)
42         f.writelines(str1)
43
44         f1.close()
45         f2.close()
46         f.close()
47
48 if __name__==‘__main__‘:
49     ld=loadDatas()
50     ld.load_compare()