@Client.command(pass_context=True)
@commands.has_permissions(manage_messages=True)
async def ping(ctx):
	await ctx.message.delete()
	await ctx.send('Pong!')

import vk_api, random, time
from vk_api.longpoll import VkLongPoll, VkEventType

vk = vk_api.VkApi(token='token')
longpoll = VkLongPoll(vk)

def send(message):
	if event.from_user: # Для ЛС
		vk.method('messages.send', {'user_id': event.user_id, 'message': message, 'random_id': random.getrandbits(64)})
	elif event.from_chat: # Для бесед
		vk.method('messages.send', {'chat_id': event.chat_id, 'message': message, 'random_id': random.getrandbits(64)})

while True:
	for event in longpoll.listen():
		if event.type == VkEventType.MESSAGE_NEW and event.to_me:
			text = event.text.lower()
			u_id = event.user_id # (Если будет нужно)
			
			if text == 'ping': # Пример
				send('pong')