save project

1.py

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