save project

3.py

+i=3
 username = 'python'
 userpassword = '123456'
 while True:
-    name=input('请输入用户名：')
-    password=input('请输入账号密码：')
-    if name == username and userpassword == password:
-        print('登录成功')
-        break
-    if name != username:
-        print('用户名不存在，请重新输入')
-        continue
-    if userpassword != password:
-        print('密码错误，请重新输入')
+    if i>0 :
+        name=input('请输入用户名：')
+        password=input('请输入账号密码：')
+        i-=1
+        if name == username and userpassword == password:
+            print('登录成功')
+            break
+        if name != username:
+            print('用户名不存在，请重新输入')
+            continue
+        if userpassword != password:
+            print('密码错误，请重新输入')
+    else:
+        print('账号已锁定')
+        exit()
 print('欢迎来到贝尔编程')
+