save project

diy2.py

 username = "python"
 userpassword = "123456"
+i=3
 while True:
-    a = input("请输入用户名:")
-    b = input("请输入密码:")
-    if a == username and b == userpassword:
-        print("登录成功!")
-        break
-    if a!=username:
-        print("用户名不存在，请重新输入")
-    elif b!=userpassword:
-        print("用密码输入有误，请重新输入")
+    if i>0:
+        a = input("请输入用户名:")
+        b = input("请输入密码:")
+        if a == username and b == userpassword:
+            print("登录成功!")
+            break
+        if a!= username:
+            print("用户名不存在，请重新输入")
+        if b!= userpassword:
+            print("用密码输入有误，请重新输入")
+        if a!= username and b!= userpassword:
+            print("用户名和密码错误!请重新输入")
+        i-=1
     else:
-        print("用户名和密码错误!请重新输入")
+        print("你的账户已锁定，请带身份证来我司解锁")
+        exit()
 print("欢迎来到贝尔编程!")
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