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'、
-
+new_a = ''
 with open(r'C:\Users\86183\Desktop\test.txt','r',encoding='utf-8')as a: 
     for b in a:
         if '刘某某:100本'in b:
             b=b.replace('刘某某:100本','刘某某:15本')
-        print(b)
+        new_a +=b
+with open(r'C:\Users\86183\Desktop\test.txt','w',encoding='utf-8')as a: 
+    a.write(new_a)
+