set member as author discord.py code example

Example 1: discord.py ban

@commands.command() # uses command decorators, in this case inside a cog
@commands.has_permissions(ban_members=True) # only people that have permissions to ban users can use this command
async def ban(self, ctx, user: discord.Member, *, reason): # The person banning someone has to ping the user to ban, and input a reason. Remove self if you are outside a cog.
    await ctx.guild.ban(user, reason=reason) # Bans the user.
    await user.send(f"You have been banned in {ctx.guild} for {reason}") # Private messages user.
    await ctx.send(f"{user} has been successfully banned.") # messages channel to tell everyone it worked

Example 2: discord.py how to use permissions

from discord import Member
from discord.ext.commands import has_permissions, MissingPermissions

@bot.command(name="kick", pass_context=True)
@has_permissions(manage_roles=True, ban_members=True)
async def _kick(ctx, member: Member):
    await bot.kick(member)

@_kick.error
async def kick_error(error, ctx):
    if isinstance(error, MissingPermissions):
        text = "Sorry {}, you do not have permissions to do that!".format(ctx.message.author)
        await bot.send_message(ctx.message.channel, text)