save project

diy3.py

+username="python"
+userpassword="123456"
+while True:
+    name=input("用户名：")
+    password=input("密码：")
+    if username!=name:
+        print("用户名错误！请重新输入！")
+    if userpassword!=password:
+        print("密码错误！请重新输入！")
+print("欢迎来到贝尔编程")

diy4.py

+username="python"
+userpassword="123456"
+while True:
+    name=input("用户名：")
+    password=input("密码：")
+    if username==name and userpassword==password:
+        print("登录成功")
+        break
+    if username!=name:
+        print("用户名错误！请重新输入！")
+        continue
+    if userpassword!=password:
+        print("密码错误！请重新输入！")
+print("欢迎来到贝尔编程")
\ No newline at end of file