save project

diy.py

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