save project

1.py

+new_data=''
 with open(r'C:\Users\78187\Desktop\book.txt','r',encoding='utf-8') as filel:
 with open(r'C:\Users\78187\Desktop\book.txt','r',encoding='utf-8') as filel:
     for data in filel:
     for data in filel:
         if '小强：10本' in data:
         if '小强：10本' in data:
@@ -5,5 +6,12 @@ with open(r'C:\Users\78187\Desktop\book.txt','r',encoding='utf-8') as filel:
 
 
         if '小兰：12本' in data:
         if '小兰：12本' in data:
             print("小兰数据在文件中")
             print("小兰数据在文件中")
+        new_data +=data
 
 
+with open(r'C:\Users\78187\Desktop\book.txt','w',encoding='utf-8') as filel:
+    filel.write(new_data)
+
+with open(r'C:\Users\78187\Desktop\book.txt','r',encoding='utf-8') as filel:
+    a=filel.read()
+    print(a)