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'
-file1=open(r'C:\Users\86152\Desktop\text.txt','w',encoding='utf-8')
-file1.write('小兰：你好！！')
-file1.close()
+new_i=''
+with open(r'C:\Users\86152\Desktop\text.txt','r',encoding='utf-8') as file1:
+    for i in file1:
+        if "小强：20本"==i:
\ No newline at end of file
+            i=i.replace('小强：20本','小强：11本')
+        new_i+=i
+with open(r'C:\Users\86152\Desktop\text.txt','w',encoding='utf-8') as file1:
+    file1.write(new_i)
+
+
+    
\ No newline at end of file