auto save

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_n = ""
+with open(r"C:\Users\Administrator\Desktop\edfs.txt",'r') as n:
+    for i in n:
+        if '小兰:12本' in i:
+            i = i.replace('小兰:12本','小兰:10本')
+        new_n += i
+with open(r"C:\Users\Administrator\Desktop\edfs.txt",'w') as n:
+    n.write(new_n)
\ No newline at end of file