auto save

diy.py

@@ -2,7 +2,14 @@
 #file1=open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
 #file1=open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
 #file1.write('小兰：12本、小丽：11本、李文：9本、张伟：16本')
 #file1.write('小兰：12本、小丽：11本、李文：9本、张伟：16本')
 #file1.close()
 #file1.close()
+new_data=''
 with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file:
 with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file:
     for data in file:
     for data in file:
-        if '小强' in data:
-            print ('数据在文件中')
+        if '小强:12本' in data:
+            data=data.replace('小强:12本','小强:13本')
+        new_data+=data
+with open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8') as file:
+    file.write(new_data)
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file:        
+    a=file.read()
+    print(a)