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'
 # 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'
+r=''
 with open(r'c:\Users\EDZ\Desktop\新建文本文档.txt','r',encoding='utf-8') as file:
 with open(r'c:\Users\EDZ\Desktop\新建文本文档.txt','r',encoding='utf-8') as file:
-    a=file.read()
-    print(a)
-    for i in a:
-        print(i)
+    
+    for d in file:
+        if '小兰：12本' in d:
+            print("zai")
+            d.replace('小兰：12本','小兰：10本')
+        r=r+d
+    print(r)
+with open(r'c:\Users\EDZ\Desktop\新建文本文档.txt','w',encoding='utf-8') as file:
+    file.write(r)
+
+
    
    
     
     
\ No newline at end of file