auto save

diy2.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'
+file1=open(r"C:\Users\Administrator\Desktop\kk.txt","a",encoding="utf-8")
+file1.write("小兰：12本\n小丽：11本\n李文：9本\n张伟：16本")
+file1.close()
+with open(r"C:\Users\Administrator\Desktop\kk.txt","r",encoding="utf-8") as file:
+    file.write("小兰：12本\n小丽：11本\n李文：9本\n张伟：16本\n")
+data_new=''
+with open(r"C:\Users\Administrator\Desktop\kk.txt","r",encoding="utf-8") as file:
+    for data in file:
+        if "小丽：11本" in data:
+            data=data.replace("小丽：11本","小丽：12本")
+        data_new+=data
+print(data_new)
+with open(r"C:\Users\Administrator\Desktop\kk.txt","w",encoding="utf-8") as file1:
+    file1.write(data_new)