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__delitem__(key) discard(key) Delete the message corresponding to key from the mailbox. If no such message exists, a KeyError exception is raised if the method was called as remove() or __delitem__() but no exception is raised if the method was called as discard(). The behavior of discard() may be preferred if the underlying mailbox format supports concurrent modification by other processes.

class socketserver.UnixDatagramServer(server_address, RequestHandlerClass, bind_and_activate=True) These more infrequently used classes are similar to the TCP and UDP classes, but use Unix domain sockets; they’re not available on non-Unix platforms. The parameters are the same as for TCPServer.

socket.shutdown(how) Shut down one or both halves of the connection. If how is SHUT_RD, further receives are disallowed. If how is SHUT_WR, further sends are disallowed. If how is SHUT_RDWR, further sends and receives are disallowed.

select.kqueue() (Only supported on BSD.) Returns a kernel queue object; see section Kqueue Objects below for the methods supported by kqueue objects. The new file descriptor is non-inheritable. Changed in version 3.4: The new file descriptor is now non-inheritable.

socket.share(process_id) Duplicate a socket and prepare it for sharing with a target process. The target process must be provided with process_id. The resulting bytes object can then be passed to the target process using some form of interprocess communication and the socket can be recreated there using fromshare(). Once this method has been called, it is safe to close the socket since the operating system has already duplicated it for the target process. Availability: Windows. New in versi

class urllib.request.UnknownHandler A catch-all class to handle unknown URLs.

str.isalnum() Return true if all characters in the string are alphanumeric and there is at least one character, false otherwise. A character c is alphanumeric if one of the following returns True: c.isalpha(), c.isdecimal(), c.isdigit(), or c.isnumeric().

handle_write() Called when the asynchronous loop detects that a writable socket can be written. Often this method will implement the necessary buffering for performance. For example: def handle_write(self): sent = self.send(self.buffer) self.buffer = self.buffer[sent:]

IMAP4.shutdown() Close connection established in open. This method is implicitly called by IMAP4.logout(). You may override this method.