def read(key):
    global handler
    return handler.read(key)
def delete(key):
    global handler
    return handler.delete(key)
def list():
    global handler
    return handler.list()
def write(key, value):
    global handler
    return handler.write(key, value)
def read(key):
	global handler
	return handler.read(key)
def list():
   	global handler
	return handler.list()
def delete(key):
	global handler
	return handler.delete(key)
def write(key, value):
	global handler
	return handler.write(key,value)