auto save

diy2.py

+i=3
+username = "python"
+userpassword = "123456"
+while True:
+    if i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i=i-1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break 
+            
+        if name!=username:
+                print("用户名不存在，请重新输入")
+                print("你还有"+str(i)+"次机会")
+                continue
+        if password!=userpassword:
+            print("密码错误，请重新输入")
+            print("你还有"+str(i)+"次机会")
+    else:
+        print("你的账号被锁定，请带身份证去银行解锁")
+        exit()
+    if password!=userpassword:
+        print("欢迎来到贝尔编程!")
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