docs: def config(client, event, channel, nick, rest):
  	"Change the running config, something like a=b or a+=b or a-=b"
  	pattern = re.compile(r'(?P<key>\w+)\s*(?P<op>[+-]?=)\s*(?P<value>.*)$')
  	match = pattern.match(rest)
  	if not match:
  		return "Command not recognized"
  	res = match.groupdict()
  	key = res['key']
  	op = res['op']
  	value = yaml.safe_load(res['value'])
  	if op in ('+=', '-='):
  		# list operation
  		op_name = {'+=': 'append', '-=': 'remove'}[op]
  		op_name
  		if key not in pmxbot.config:
  			msg = "{key} not found in config. Can't {op_name}."
  			return msg.format(**locals())
  		if not isinstance(pmxbot.config[key], (list, tuple)):
  			msg = "{key} is not list or tuple. Can't {op_name}."
  			return msg.format(**locals())
  		op = getattr(pmxbot.config[key], op_name)
  		op(value)
  	else:  # op is '='
  		pmxbot.config[key] = value