auto save

dfdsdpy

+with open(r'C:\Users\Administrator\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

gffd.py

+with open(r'c:\Users\Administrator\Desktop\新建文本文档.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

gyfg.py

+# 在diy1的基础上选一种打开方式，建议选with open() as
+with open(r'c:\Users\Administrator\Desktop\sales_list.txt',' a','encoding='utf-8') as file:
+    a=file.readlines()
+    #print(a)
+
+for i in a:
+    print(i)
\ No newline at end of file