Discord.py-rewrite wait_for() how do i use?

wait_for takes a check argument that is a function that takes the arguments of the event you’re waiting for and determines whether or not that is the event you’re waiting for.

For example, the on_message event takes a message argument, so if we wanted to check the author of a message we could do:

msg = await client.wait_for('message', check=lambda message: message.author == ctx.author)

to see that the new message comes from the same person who invoked the currently running command.

If we wanted to send a message to the next person to react with a certain emoji, we could do

reaction, user = await client.wait_for('reaction_add', 
                                       check=lambda reaction, user: reaction.emoji == '👍')
await user.send("👍 to you too!")

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