save project

diy1.py

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