save project

diy2.py

+q=3
+username = "python"
+userpassword = "123456"
+while True:
+    if q>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        a=a-1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        elif name!=username:
+            print("用户名错误!请重新输入")
+        else:
+            print("密码错误!请重新输入")
+            exit    
+print("欢迎来到贝尔编程!")
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