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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def command(self, dbname, spec, slave_ok=False, read_preference=ReadPreference.PRIMARY, codec_options=DEFAULT_CODEC_OPTIONS, check=True, allowable_errors=None, check_keys=False, read_concern=DEFAULT_READ_CONCERN, write_concern=None, parse_write_concern_error=False, collation=None):
 """Execute a command or raise ConnectionFailure or OperationFailure. :Parameters: - `dbname`: name of the database on which to run the command - `spec`: a command document as a dict, SON, or mapping object - `slave_ok`: whether to set the SlaveOkay wire protocol bit - `read_preference`: a read preference - `codec_options`: a CodecOptions instance - `check`: raise OperationFailure if there are errors - `allowable_errors`: errors to ignore if `check` is True - `check_keys`: if True, check `spec` for invalid keys - `read_concern`: The read concern for this command. - `write_concern`: The write concern for this command. - `parse_write_concern_error`: Whether to parse the ``writeConcernError`` field in the command response. - `collation`: The collation for this command. """

        if self.max_wire_version < 4 and not read_concern.ok_for_legacy:
            raise ConfigurationError(
                'read concern level of %s is not valid '
                'with a max wire version of %d.'
                % (read_concern.level, self.max_wire_version))
        if not (write_concern is None or write_concern.acknowledged or
                collation is None):
            raise ConfigurationError(
                'Collation is unsupported for unacknowledged writes.')
        if self.max_wire_version >= 5 and write_concern:
            spec['writeConcern'] = write_concern.document
        elif self.max_wire_version < 5 and collation is not None:
            raise ConfigurationError(
                'Must be connected to MongoDB 3.4+ to use a collation.')
        try:
            return command(self.sock, dbname, spec, slave_ok,
                           self.is_mongos, read_preference, codec_options,
                           check, allowable_errors, self.address,
                           check_keys, self.listeners, self.max_bson_size,
                           read_concern,
                           parse_write_concern_error=parse_write_concern_error,
                           collation=collation)
        except OperationFailure:
            raise
        # Catch socket.error, KeyboardInterrupt, etc. and close ourselves.
        except BaseException as error:
            self._raise_connection_failure(error)