auto save

diy2.py

+a=0
+username = "1"
+userpassword = "1"
+while True:
+    a = input("请输入用户名:")
+    b = input("请输入密码:")
+    a+=1
+    if a == username and b == userpassword:
+        break
+        print("登录成功!")
+    else:    
+        
+        if b !=userpassword:
+            print("账号错")
+        if a !=username:
+            print("密码错")
+    if a==3:
+        print("你的帐号被锁定")
+        exit()
+print("欢迎来到贝尔编程!")
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