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'
 file=open(r'C:\Users\Administrator\Desktop\book.txt','w',encoding='utf-8')
-file.write("'小兰:12本','小丽:11本','李文:9本','张伟:16本'")
-file.close()
\ No newline at end of file
+file.write("'小兰:12本','小丽:11本','李文:9本','张伟:16本','12")
+file.close()
+new_data=''
+with open(r'C:\Users\Administrator\Desktop\book.txt','r',encoding='utf-8') as file:
+    for data in file:
+        if '12' in data:
+            data=data.replace('12','15')
+        new_data +=data
+with open(r'C:\Users\Administrator\Desktop\book.txt','w',encoding='utf-8') as file:
+    file.write(new_data)
\ No newline at end of file