Python obtains system CPU and memory

def getMemCpu(self):
data = psutil.virtual_memory()
total = data.total # Total memory , Unit is byte
free = data.available # Memory can be
memory = "Memory usage:%d" % (int(round(data.percent))) + "%" + " "
cpu = "CPU:%0.2f" % psutil.cpu_percent(interval=1) + "%"
return memory + cpu