auto save

diy2.py

+username = "python"
+userpassword = "123456"
+i=3
+while True:
+    if i<=3:
+        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!")
+            print("欢迎来到贝尔编程!")
+            break
+        if  name!=username:
+            print("账号不存在")
+            print("温馨提示，您还有"+str(i)+"次输入次数")
+            continue
+        if  password!=userpassword:
+            print("请输入正确密码")
+            print("温馨提示，您还有"+str(i)+"次输入次数")
+            continue
+    else:
+        print("输入次数超出，请携带身份证到公司办理")
+        exit()#停止程序
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