auto save

1.py

+# file1 = open(r"C:\Users\Administrator\Desktop\book.txt",'r',encoding = 'utf-8')
+# file1.write('1号：10本\n')
+# file1.write('2号：14本\n')
+# file1.write('3号：8本\n')
+# file1.write('4号：3本\n')
+# file1.close()
+new_data = '                                                            '
+with open(r"C:\Users\Administrator\Desktop\book.txt",'r',encoding = 'utf-8') as file1:
+    for data in file1:
+        if '1号：10本' in data:
+            print('1号数据在文件中')
+        if '2号：14本' in data:
+            print('2号数据在文件中')
+with open(r"C:\Users\Administrator\Desktop\book.txt",'w',encoding = 'utf-8') as file1:
+    file1.write(new_data)
+with open(r"C:\Users\Administrator\Desktop\book.txt",'r',encoding = 'utf-8') as file1:
+    a = file1.read()
+    print(a)
\ No newline at end of file