auto save

diy3.py

+new_data= ""
+
+with open(r"C:\Users\MC3-06\Desktop\tt.txt","r",encoding="utf-8") as tdfgrv:
+    for data in tdfgrv:
+        if "小兰：12" in data:
+            data = data.replace("小兰：12", "小兰：11")
+        new_data += data
+    print(new_data) 
+
+with open(r"C:\Users\MC3-06\Desktop\tt.txt", "w",encoding="utf-8") as tdfgrv2:
+    tdfgrv2.write(new_data)
+    # tdfgrv.write("小兰：12\n小强:10\n李明：15" )