save project

24diy1.py

+i=3
 usename = "python"
 userpassword = "123456"
 while True:
-    a=input("请输入用户名")
-    b=input("请输入密码")
-    if a == usename and b == userpassword:
-        print("登录成功!")
-        break
-    if a != usename:
-        print("用户名错误")
-        continue
-    if b != userpassword:
-        print("密码错误")
+    if i>0:
+        a=input("请输入用户名")
+        b=input("请输入密码")
+        i-=1
+        if a == usename and b == userpassword:
+            print("登录成功!")
+            break
+        if a != usename:
+            print("用户名错误")
+            continue
+        if b != userpassword:
+            print("密码错误")
+    else:
+        exit()
 print("欢迎来到贝尔编程")
\ No newline at end of file