auto save

1.py

+#完成修改数据前的遍历和条件判断，找下'小强:10本'在不在数据中,以及小兰的数据'小兰:12本'在不在
+
+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')
+        if '小兰':12本' in data:
+            print('小兰数据在文件中')