auto save

o.py

+file=open(r'C:\Users\29018\Desktop\test.txt','w',encoding='utf-8')
+file.write('国庆节快乐')
+file.close()
+
+file=open(r'C:\Users\29018\Desktop\test.txt','r',encoding='utf-8')
+a=file.read()
+print(a)
+file.close()
+
+file=open(r'C:\Users\29018\Desktop\test.txt','r',encoding='utf-8')
+for i in file:
+    if '国' in i:
+        print("所查找内容在文件里")
+