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@ivar qname: The query name
@type qname: dns.name.Name object
@ivar rdtype: The query type
@type rdtype: int
@ivar rdclass: The query class
@type rdclass: int
@ivar response: The response message
@type response: dns.message.Message object
@ivar rrset: The answer
@type rrset: dns.rrset.RRset object
@ivar expiration: The time when the answer expires
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@ivar canonical_name: The canonical name of the query name
@type canonical_name: dns.name.Name object
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@ivar next_cleaning: The time the cache should next be cleaned (in seconds
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@ivar data: A dictionary of cached data
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@type nameservers: list of strings
@ivar search: The search list. If the query name is a relative name,
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@type search: list of dns.name.Name objects
@ivar port: The port to which to send queries. The default is 53.
@type port: int
@ivar timeout: The number of seconds to wait for a response from a
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@type timeout: float
@ivar lifetime: The total number of seconds to spend trying to get an
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@type keyring: dict
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@type edns: int
@ivar ednsflags: The EDNS flags
@type ednsflags: int
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@type payload: int
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@type flags: int
@ivar cache: The cache to use. The default is None.
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