send_help(entity=<bot>)

        |coro|

        Shows the help command for the specified entity if given.
        The entity can be a command or a cog.

        If no entity is given, then it'll show help for the
        entire bot.

        If the entity is a string, then it looks up whether it's a
        :class:`Cog` or a :class:`Command`.

        .. note::

            Due to the way this function works, instead of returning
            something similar to :meth:`~.commands.HelpCommand.command_not_found`
            this returns :class:`None` on bad input or no help command.

        Parameters
        ------------
        entity: Optional[Union[:class:`Command`, :class:`Cog`, :class:`str`]]
            The entity to show help for.

        Returns
        --------
        Any
            The result of the help command, if any.

async def send_help(self, *args):
        """send_help(entity=<bot>)

        |coro|

        Shows the help command for the specified entity if given.
        The entity can be a command or a cog.

        If no entity is given, then it'll show help for the
        entire bot.

        If the entity is a string, then it looks up whether it's a
        :class:`Cog` or a :class:`Command`.

        .. note::

            Due to the way this function works, instead of returning
            something similar to :meth:`~.commands.HelpCommand.command_not_found`
            this returns :class:`None` on bad input or no help command.

        Parameters
        ------------
        entity: Optional[Union[:class:`Command`, :class:`Cog`, :class:`str`]]
            The entity to show help for.

        Returns
        --------
        Any
            The result of the help command, if any.
        """
        from .core import Group, Command

        bot = self.bot
        cmd = bot.help_command

        if cmd is None:
            return None

        cmd = cmd.copy()
        cmd.context = self
        if len(args) == 0:
            await cmd.prepare_help_command(self, None)
            mapping = cmd.get_bot_mapping()
            return await cmd.send_bot_help(mapping)

        entity = args[0]
        if entity is None:
            return None

        if isinstance(entity, str):
            entity = bot.get_cog(entity) or bot.get_command(entity)

        try:
            qualified_name = entity.qualified_name
        except AttributeError:
            # if we're here then it's not a cog, group, or command.
            return None

        await cmd.prepare_help_command(self, entity.qualified_name)

        if hasattr(entity, '__cog_commands__'):
            return await cmd.send_cog_help(entity)
        elif isinstance(entity, Group):
            return await cmd.send_group_help(entity)
        elif isinstance(entity, Command):
            return await cmd.send_command_help(entity)
        else:
            return None