auto save

11.py

 # 补充数据的第一种写法：
-# file= open(r'\\Mac\Home\Desktop\book.txt','a',encoding='utf-8')
-# file.write('小李：10本\n') 
-# file.write('李白：15本\n')
-# file.close()
+file= open(r'\\Mac\Home\Desktop\book.txt','r',encoding='utf-8')
+a=file.read() 
+print(a)
+file.close()
 
 #     file.write('里：10本\n')
 #     file.write('你：10本\n')
-with open(r'\\Mac\Home\Desktop\book.txt','a',encoding='utf-8') as file:
-    file.write('li：10本\n') 
-    file.write('李明：15本\n')
+# with open(r'\\Mac\Home\Desktop\book.txt','r',encoding='utf-8') as file:
+#     a=file.read() 
+#     print(a)
+
+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')
\ No newline at end of file