python统计cpu的利用率

#-*-coding=utf-8-*-
import win32pdh
import time
# Counter paths
PROCESSOR_PERCENT = r'Processor(_Total)% Processor Time'
MEMORY_PERCENT = r'Memory% Committed Bytes In Use'
MEMORY_COMMITTED = r'MemoryCommitted Bytes'
PROCESS_BYTES = lambda x: r'Process(%s)Private Bytes' % x
class Query:
    def __init__(self):
        self.counters = {}
        self.query = None
        self.query = win32pdh.OpenQuery(None,0)
    def add_counter(self,path):
        if win32pdh.ValidatePath(path) != 0:
            raise Exception('Invalid path: %s' % path)
        counter = win32pdh.AddCounter(self.query,path,0)
        self.counters[path] = counter
    def remove_counter(self,path):
        win32pdh.RemoveCounter(self.counters[path])
        del self.counters[path]
    def get_values(self):
        values = {}
        win32pdh.CollectQueryData(self.query)
        for path in self.counters:
            status,value = win32pdh.GetFormattedCounterValue(
                    self.counters[path],win32pdh.PDH_FMT_LONG)
            values[path] = value
        return values
sysinfo_query = Query()
sysinfo_query.add_counter(PROCESSOR_PERCENT)
sysinfo_query.add_counter(MEMORY_PERCENT)
sysinfo_query.get_values()
def get_sysinfo():
    """Return a tuple (mem_usage,cpu_usage)."""
    info = sysinfo_query.get_values()
    return info[MEMORY_PERCENT],info[PROCESSOR_PERCENT]
listcpu=[]
while True:
    time.sleep(2)
    x,y=get_sysinfo()
    listcpu.append(y)
    if len(listcpu)==10:
        icount=0
        for c in listcpu:
            if c>4:
                icount+=1
        if icount>5:
            print "在统计的1分钟内，cpu已经有5次大于4%"
        listcpu=[]
    print y