auto save

1.py

+username = 'python'
+userpassword ='123456'
+while True:
+    name=input('请输入用户名')
+    password=input('请输入密码')
+
+    if username == name and userpassword == password:
+        print('登录成功')
+        break
+    if username != name:
+        print('请重新输入用户名')
+        continue
+    if userpassword != password:
+        print('请重新输入密码')
+print('欢迎')
+