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_data=''
 files=open(r'C:\Users\HP\Desktop\test.txt','w',encoding='utf-8')
 files.write('小兰：12本\n')
 
@@ -7,6 +8,14 @@ with open(r'C:\Users\HP\Desktop\test.txt','a',encoding='utf-8') as files:
     files.write('小丽：11本\n') 
     files.write('李文：9本\n')
 with open(r'C:\Users\HP\Desktop\test.txt','r',encoding='utf-8') as files:
-    for data in files:
-        if '小丽：11本'in data:
-            print('小丽在数据中')
\ No newline at end of file
+     for data in files:
+         if '小丽：11本'in data:
+             data=data.replace('小丽：11本','小丽：12本')
+         new_data+=data
+with open(r'C:\Users\HP\Desktop\test.txt','w',encoding='utf-8') as files:
+     files.write(new_data)
+with open(r'C:\Users\HP\Desktop\test.txt','r',encoding='utf-8') as files:
+    a=files.read()
+    print(a)
+
+