discord.py unban command
@client.command()
async def unban(ctx, *, member):
banned_users = await ctx.guild.bans()
member_name, member_discriminator = member.split('#')
for ban_entry in banned_users:
user = ban_entry.user
if (user.name, user.discriminator) == (member_name, member_discriminator):
await ctx.guild.unban(user)
await ctx.channel.send(f"Unbanned: {user.mention}")