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\EDZ\Documents\lijunhao.txt",'w',encoding='utf-8')
+file1.write('小兰：12本\n')
+file1.write('小丽：11本\n')
+file1.close() 
+# with open(r"C:\Users\EDZ\Documents\lijunhao.txt",'a',encoding='utf-8')as file1:
+#     file1.write('小兰：12本\n')
+new_file1='  '
+with open(r"C:\Users\EDZ\Documents\lijunhao.txt",'r',encoding='utf-8')as file1:
+    for line in file1:
+        if "小丽"in line:
+            line.replace('小兰：12本','张伟：16本')
+        new_file1+=line
+with open(r"C:\Users\EDZ\Documents\lijunhao.txt",'w',encoding='utf-8')as file1:
+       file1.write(new_file1)