auto save

iogin_1.py

+Username = 'python'
+Userpassword = '123456'
+while True:
+    name = input("请输入用户名:")
+    password = input("请输入用户密码:") 
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    if name != username:
+        print("用户名不存在,请重新输入!")
+    if password != userpassword:
+        print("密码输入有误,请重新输入!")    
+print("欢迎来到贝尔编程器!")        
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