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'
+new_a=''
 file1=open(r'/Users/xujunheng/Desktop/test.txt','r',encoding='utf-8')
 a=file1.read()
 print(a)
 file1.close()
 with open(r'/Users/xujunheng/Desktop/test.txt','r',encoding='utf-8') as file1:
     for a in file1:
-        if "小红，19本" in a:
-            print("数据在文件夹中")
\ No newline at end of file
+        if "小明，20本" in a:
+            a=a.replace("小明，20本","小明，21本")
+        new_a+=a
+with open(r'/Users/xujunheng/Desktop/test.txt','w',encoding='utf-8') as file1:
+    file1.write(new_a)
+    
\ No newline at end of file