auto save

diy2.py

+username = "python"
+userpassword = "123456"
+i=3
+while True:
+    if i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i-=1
+        if name == username and password == userpassword:
+            break
+            print("登录成功!")
+        if name!= username:
+            print("名称错误，请重新输入！")
+            continue
+        if password!= userpassword:
+            print("密码错误，请重新输入！")
+        if i==0:
+            print("gun")
+            exit()
+print("欢迎来到贝尔编程!")
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