discord.py How to check if a member has ever been to a guild code example

Example: how to delete role discord py rewrite

@client.command(name="delete_role", pass_context=True)
async def delete_role(ctx, role_name):
    #find role object
    role_object = discord.utils.get(ctx.message.guild.roles, name=role_name)
    #delete role
    await role_object.delete()