save project

diy2.py

+username = "python"
+userpassword = "123456"
+t=3
+while True:
+    if t>0
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+            print("用户名和密码错误!请重新输入")
+        if name!=username:
+            print("用户名不对")
+            continue
+        if password!=userpassword:
+            print("密码不对")
+            print("还有str(t)次机会")
+        if password!=userpassword:
+            
+print("欢迎来到贝尔编程!")
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