auto save

diy.py

-with open(r"C:\Users\Windows\Desktop\test.txt",'a',encoding='utf_8')as file1:
-    file1.write('张凌：16本\n')
+#file1=open(r"C:\Users\Windows\Desktop\test.txt",'a',encoding='utf_8')
+#file1.write('张凌：16本\n')
+#file1.close()
 
 
+
+
+#with open(r"C:\Users\Windows\Desktop\test.txt",'a',encoding='utf_8')as file1:
+#    file1.write('张凌：16本\n')
+    
+
+#file1=open(r"C:\Users\Windows\Desktop\test.txt",'r',encoding='utf_8')
+#aa=file1.read()
+#print(aa)
+
+
+with open(r"C:\Users\Windows\Desktop\test.txt",'r',encoding='utf_8')as file1:
+    aa=file1.read()
+    print(aa)
\ No newline at end of file

diy1.py

+with open(r"C:\Users\Windows\Desktop\test.txt",'r',encoding='utf_8')as file1:
+    for i in file1:
+        print(i)
+    if '小兰：12本\n' in filel:
+        print('存在')
+    else:
+        print('不存在')