auto save

diy

+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-=1
+        if name==username and password==userpassword:
+            print("登录成功")
+            break
+        if name != username:
+            print("用户名布不z'czc")
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