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'
+new_data=''
 with open(r'C:\Users\qiaoh\Desktop\test.txt','r',encoding='utf-8') as a:                                                       
     for data in a:
         if '王老师:1000本' in data:
             data=data.replace('王老师:1000本','王老师:10000本')
-        print(data)
+        new_data += data
+with open(r'C:\Users\qiaoh\Desktop\test.txt','w',encoding='utf-8') as a:
+    a.write(new_data)