Проверка существования ключа

data_riak_old = {}
data_riak_old['host'] = "x.x.x.x"
data_riak_old['port'] = "8098"

key = "jjjjjjjjj"

isset = keyIsset(data_riak_old, key)

def keyIsset(data_riak, key):
	
	import requests
	
	url = "http://" + data_riak['host'] + ":" + data_riak['port'] + "/riak/media/" + key
	
	try:
		r = requests.get(url)
		status = str(r.status_code)
		
		if(status == "200"):
			isset = "Isset"
		elif(status == "404"):	
			isset = "Not Isset"
		else:
			isset = "Error"
			
	except requests.exceptions.HTTPError, e:	
			
		print("keyIsset Error = " + str(e))				
		
		
		

	return isset