save project

diy2.py

+username = "python"
+userpassword = "123456"
+i=3
+while True:
+    if i>0:
+        name = input("请输入用户名:")
+        i=i-1
+        if name == username:
+            password = input("请输入密码:")
+            if password==userpassword:
+                print("登录成功!")
+                break 
+            else:
+                print("密码错误!")
+                print("您还有"+str(i)+"次机会")
+        else:
+            print("用户名错误!")
+            print("您还有"+str(i)+"次机会")
+    else:
+        print("你的次数用完了。")
+        exit()
+print("欢迎来到贝尔编程!")
+
+     
+