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'
+b=''
 with open(r'C:\Users\admin\Desktop\test.txt','r',encoding='utf-8') as a:
 # a.write('小兰:12本\n')
 # a.write('小丽:11本\n')
@@ -10,5 +11,8 @@ with open(r'C:\Users\admin\Desktop\test.txt','r',encoding='utf-8') as a:
     for i in a:
         if 'xx:11本' in i:
             print("True")
-        i.replace('xx:11本','3')
-    print(a.read())
\ No newline at end of file
+            i=i.replace('xx:11本','3')
+        print(i)
+        b+=i
+with open(r'C:\Users\admin\Desktop\test.txt','w',encoding='utf-8') as a:
+    a.write(b)
\ No newline at end of file