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\Administrator\Desktop\test.txt','r',encoding='utf-8') as file1:
-    # a = file1.read()
-    # print(a)
+    data2 = ""
     for data in file1:
-        if data == "小强：10本"：
-            print("找到了SB")
+        if  "小兰：12本" in data:
+            data=data.replace("小兰：12本","小兰：10本") 
+        data2 = data2 + data
+    print(data2)
+
+with open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8') as file2:
+    file2.write(data2)
\ No newline at end of file