save project

diy1.py

+i=3
 username = "python"
 userpassword = "123456"
 while True:
-    a=input("用户账号:")
-    b=input("账号密码:")
-    if a==username and b==userpassword:
-        print("登陆成功！")
-        break
-    else:
-        if username!=a:
-            print("用户名错误，请重新输入！")
-            continue
+    if i>0:
+        a=input("用户账号:")
+        b=input("账号密码:")
+        i-=1
+        if a==username and b==userpassword:
+            print("登陆成功！")
+            break
         else:
-            print("密码错误，请重新输入！")
+            if username!=a:
+                print("用户名错误，请重新输入！")
+                continue
+            else:
+                print("密码错误，请重新输入！")
+                exit()
 print("欢迎来到贝尔编程！")
\ No newline at end of file