save project

diy.py

@@ -5,9 +5,16 @@
 #file1.write('李文：9本\n')
 #file1.write('张伟：16本\n')
 #file1.close()
+new_data=''
 with open(r'C:\Users\Administrator\Desktop\book.txt','a',encoding='utf-8') as file:
     file.write('小强：10本\n')
     file.write('李明：15本\n')
     for data in file:
         if '小强:10本' in data:
-            print('数据在文件中')
\ No newline at end of file
+            data=data.replace('小强： 10本', '小强：11本')
+            new_data +=data
+with open(r'C:\Users\Administrator\Desktop\book.txt','w',encoding='utf-8') as file:
+    file.write(new_data)
+
+        
+            
\ No newline at end of file