auto save

diy.py

@@ -4,4 +4,21 @@ file.write('小兰：12本\n')
 file.write('小丽：11本\n')
 file.write('李文：9本\n')
 file.write('张伟：16本\n')
-file.close()
\ No newline at end of file
+file.close()
+
+with open(r'C:\Users\HP\Desktop\test.txt','a',encoding='utf-8') as file:
+    file.write('小强：10本\n')
+    file.write('李明：15本\n')
+new_data=''
+with open(r'C:\Users\HP\Desktop\test.txt','r',encoding='utf-8') as file:
+    for data in file:
+        if '小强：10本' in data:
+            data=data.replace('小强：10本','小强：11本')
+        if '小兰：12本' in data:
+            data=data.replace('小兰：12本','小兰：14本')
+        new_data+=data
+with open(r'C:\Users\HP\Desktop\test.txt','w',encoding='utf-8') as file:
+    file.write(new_data)
+with open(r'C:\Users\HP\Desktop\test.txt','r',encoding='utf-8') as file:
+    a=file.read()
+    print(a)
\ No newline at end of file