code: def getContext(self, context_name = 'default'):
  		
  		if context_name == 'default' and 'default' not in self.contexts:
  			self('default')
  
  		return self.contexts[context_name]
docs: Get a context by name, create the default context if it does not exist
  
  		Params:
  			context_name (string):
  				Context name
  
  		Raises:
  			KeyError:
  				If the context name does not exist
  
  		Returns:
  			bubbler.Bubbler:
  				Named context