auto save

diy.py

+# # 新建、打开文件
+# file = open(r'C:\Users\EDY\Desktop\test.txt','w',encoding='utf-8')
+# # 写入数据
+# file.write('小兰：12本')
+# # 关闭文件
+# file.close()
+
+# with open(r'C:\Users\EDY\Desktop\test.txt','a',encoding='utf-8') as file:
+#     file.write('\n小强：10本\n')
+#     file.write('李明：15本\n')
+
+# 读取文件
+with open(r'C:\Users\EDY\Desktop\test.txt','r',encoding='utf-8') as file:
+    a = file.read()
+    print(a)