save project

diy.py

+new_dafa=''# 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'
+with open(r'C:\Users\Dell\Desktop\book.txt','r',encoding='utf-8') as file1:
+    for chick in file1:
+        if '小丽：11本' in chick:
+            chick=chick.replace('小丽：11本','小丽：15本')
+        new_dafa+=chick
+with open(r'C:\Users\Dell\Desktop\book.txt','w',encoding='utf-8') as file1:
+    file1.write(new_dafa)