auto save

test1.py

+username = "python"
+userpassword = "123456"
+while True:
+    name = input("请输入用户名")
+    password = input("请输入密码")
+    if name==username and password == userpassword:
+        print("登陆成功")
+    elif name!=username and password == userpassword:
+        print("用户名错误")
+    # elif:用户名正确的情况下密码错误
+    else:
+        print("登录失败，密码或用户名错误")
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