auto save

diy2.py

+a=3
+username = "python"
+userpassword = "123456"
+while True:
+    if a>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+   
+        a=a-1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        elif  name != username:
+            print("1")
+            
+        elif  password != userpassword:
+            print("2")
+        else:  
+            print("用户名和密码错误!请重新输入")
+            print("s"+str(a)+"b")
+    else :
+        print("vsf")
+        exit()
+print("欢迎来到贝尔编程!")
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