save project

diy.py

-
+new_data=''
 with open(r'C:\Users\Administrator\Desktop\book.txt','r',encoding='utf-8') as file1:
     for data in file1:
         if '小强:10本' in data:
-            print('小强在数据中')
+            data=data.replace('小强:10本','小强:11本')
         if '小兰:12本'in data:
-            print('小兰在数据中')
+            data=data.replace('小兰:12本','小兰:14本')
+        new_data +=data
+with open(r'C:\Users\Administrator\Desktop\book.txt','w',encoding='utf-8') as file1:
+    file1.write(new_data)
+
+with open(r'C:\Users\Administrator\Desktop\book.txt','r',encoding='utf-8') as file1:
+    a=file1.read()
+    print(a)
\ No newline at end of file