save project

diy.py

+# 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：9本'、'张伟：16本'
+with open(r"C:\Users\admin\Desktop\book.txt",'w',encoding="utf-8")as file:
+    file.write('小兰:12本\n小丽:11本\n李文:9本\n小强:10本')   
+new_data="" 
+with open(r"C:\Users\admin\Desktop\book.txt",'r',encoding="utf-8")as file:
+    for data in file:
+        data.replace("小兰:12本","小兰:14本")
+        data.replace("小强:10本","小强:11本")
+        new_data+=data
+    print(new_data)
+with open(r"C:\Users\admin\Desktop\book.txt",'w',encoding="utf-8")as file:
+    file.write(new_data)
+ #   file.write("小强:12本\n李明:15本")
+#file=open(r"C:\Users\admin\Desktop\book.txt",'a',encoding="utf-8")
+