save project

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
+i = 3
 while True:
 while True:
-    if i == 3
-    name = input("请输入用户名:")
-    password = input("请输入密码:")
-    if name == username and password == userpassword:
-        print("登录成功!")
-    if name != username:
-        print()
-    print("用户名和密码错误!请重新输入")
+    if i > 0 :
+        i = i - 1
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        elif name != username:
+            print('用户不存在')
+            print('您还有' + str(i) +'次机会')
+        else:
+            print('密码错误')
+            print('您还有' + str(i) +'次机会')
+
+    else:
+        print('用户锁定')
+        exit()
+        
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
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