python (3.11.7)
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c t d )$Add message and return assigned key.&Method must be implemented by subclassNotImplementedErrorr messages r" addz Mailbox.add* !"JKKKr$ c t d )=Remove the keyed message; raise KeyError if it doesn't exist.r' r( r keys r" removezMailbox.remove. r- r$ c 0 | | d S N)r2 r0 s r" __delitem__zMailbox.__delitem__2 s Cr$ c T | | dS # t $ r Y dS w xY wz'If the keyed message exists, remove it.N)r2 KeyErrorr0 s r" discardzMailbox.discard5 sA KK DD s
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