save project

lesson4.py

+username = "python"
+userpassword = "123456"
+
+while True:
+    name = input("账号：")
+    pwd = input("密码: ")
+    if name == username and userpassword == pwd:
+        print("正确登录")
+        break
+    if name!=username:
+        print("用户名错误,请重新输入")
+        continue
+    if pwd!= userpassword:
+        print("密码错误,请重新输入")
+print("登录成功")
+