discord.py send msg in a channel code example

Example 1: how to send a message in a specific channel discord.py

channel = client.get_channel(12324234183172)
await channel.send('hello')

Example 2: discord.py add reaction to message

#1
message = ctx.send("text")
#2
message = channel.send("text")
#3
message = channel.fetch_message(messageid)
#add reaction to message
emoji = '\N{THUMBS UP SIGN}'
await message.add_reaction(emoji)