>>> import psutil
获取cpu信息
>>> psutil.cpu_times()
scputimes(user=128258.38, nice=12.29, system=88369.31, idle=6713420.33, iowait=3290.63, irq=1069.04, softirq=3368.56, steal=0.0, guest=0.0)
>>> psutil.cpu_times().idle  
6717807.87

获取cpu百分比信息
>>> psutil.cpu_times_percent()
scputimes(user=3.0, nice=0.0, system=2.0, idle=94.8, iowait=0.1, irq=0.0, softirq=0.1, steal=0.0, guest=0.0)

获取内存信息
>>> psutil.virtual_memory() 
svmem(total=4019073024L, available=2577477632L, percent=35.9, used=2648985600L, free=1370087424L, active=1565192192, inactive=904339456, buffers=375177216L, cached=832212992)