Looks for keys of the format keyword_value. 
	And return a dictionary with {keyword:value} format

	Parameters:
	-----------
		from_kwargs : dict
			Original dictionary
		to_kwargs : dict
			Dictionary where the items will be appended
		keyword : string
			Keyword to look for in the orginal dictionary
		clean_origin : bool
			If True then the k,v pairs from the original 
			dictionary are deleted

def kwargs_from_keyword(from_kwargs,to_kwargs,keyword,clean_origin=True):
	"""
	Looks for keys of the format keyword_value. 
	And return a dictionary with {keyword:value} format

	Parameters:
	-----------
		from_kwargs : dict
			Original dictionary
		to_kwargs : dict
			Dictionary where the items will be appended
		keyword : string
			Keyword to look for in the orginal dictionary
		clean_origin : bool
			If True then the k,v pairs from the original 
			dictionary are deleted
	"""
	for k in list(from_kwargs.keys()):
		if '{0}_'.format(keyword) in k:
			to_kwargs[k.replace('{0}_'.format(keyword),'')]=from_kwargs[k]
			if clean_origin:
				del from_kwargs[k]
	return to_kwargs