docs: def cancel(self, consumer_tag=None):
  		"""
  		Cancels the current consuming action by using the stored consumer_tag. If a consumer_tag is given, that one is used instead.
  
  		Parameters
  		----------
  		consumer_tag: string
  			Tag of consumer to cancel
  		"""
  		if not consumer_tag:
  			if not hasattr(self, "consumer_tag"):
  				return
  			consumer_tag = self.consumer_tag
  		self.channel.basic_cancel(consumer_tag)