save project

diy.py

@@ -4,7 +4,11 @@
 #file1.close()
 #with open(r'C:\Users\Administrator\Desktop\test.txt','a',encoding='utf-8') as file1:
     #file1.write("\n小强：10本\n李明：15本\n")  
+new_data=' '
 with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file1:
     for data in file1:
         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\test.txt','w',encoding='utf-8') as file1:
+    file1.write("new_data")
\ No newline at end of file