save project

diy2.py

+i=3
 username = "python"
 userpassword = "123456"
 while True:
-    name = input("请输入用户名:")
-    if name != username:
-        print("该用户不存在！")
-        continue
-    password = input("请输入密码:")
-    if name == username and password == userpassword:
-        print("登录成功!")
-        break
-    if name != username:
-        print("该用户不存在！")
-        continue
-    if password != userpassword:
-        print("该密码不存在！")
+    if i>0:
+        i-=1
+        name = input("请输入用户名:")
+        if name != username:
+            print("该用户不存在！")
+            continue
+        password = input("请输入密码:")
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name != username:
+            print("该用户不存在！")
+            continue
+        if password != userpassword:
+            print("该密码不存在！")
+    else:
+        print("你的账号已被封")
+        exit()
 print("欢迎来到贝尔编程!")
\ No newline at end of file