save project

diy.py

@@ -6,10 +6,19 @@
 
 # with open(r'C:\Users\Administrator\Desktop\book.txt','a',encoding='utf-8') as file1:
 #     file1.write("小兰:12本\n小丽:11本\n李文:9本\n张伟:16本")
-
+new_data=""
 with open(r'C:\Users\Administrator\Desktop\book.txt','r',encoding='utf-8') as file1:
     # a=file1.read()
     # print(a)
     for data in file1:
-        if '小强:10本' in data:
-            print('数据在文件中')
\ No newline at end of file
+        if '小兰:12本' in data:
+            # print('数据在文件中')
+            data=data.replace("小兰:12本","小兰15本")
+        new_data=new_data+data
+print(new_data)
+
+with open(r'C:\Users\Administrator\Desktop\book.txt','w',encoding='utf-8') as file1:
+     file1.write(new_data)
+
+  
+    
\ No newline at end of file