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'
-filel=open(r'C:\test.txt',"w"",encoding="utf-8")
-filel.write("小兰:12")
-filel.write("小丽:11")
-filel.write("李文:9")
-filel.write("张伟:16")
-filel.close()
+newdata=""
+with open(r'C:\test.txt',"r",encoding="utf-8")as file1:
+    for data in file1:
+        if("小兰:12" in data):
+            data.replace("小兰：12","小兰：200")
+    newdata+=data
+with open(r'C:\test.txt',"w",encoding="utf-8")as file2:
+    file2.write(newdata)
\ No newline at end of file