# -*- coding:utf-8 -*- -

import os, time

last_worktime=0

last_idletime=0

def get_cpu():

        global last_worktime, last_idletime

        f=open("/proc/stat","r")

        line=""

        while not "cpu " in line: line=f.readline()

        f.close()

        spl=line.split(" ")

        worktime=int(spl[2])+int(spl[3])+int(spl[4])

        idletime=int(spl[5])

        dworktime=(worktime-last_worktime)

        didletime=(idletime-last_idletime)

        rate=float(dworktime)/(didletime+dworktime)

        last_worktime=worktime

        last_idletime=idletime

        if(last_worktime==0): return 0

        return rate

def get_mem_usage_percent():

    try:

        f = open('/proc/meminfo', 'r')

        for line in f:

            if line.startswith('MemTotal:'):

                mem_total = int(line.split()[1])

            elif line.startswith('MemFree:'):

                mem_free = int(line.split()[1])

            elif line.startswith('Buffers:'):

                mem_buffer = int(line.split()[1])

            elif line.startswith('Cached:'):

                mem_cache = int(line.split()[1])

            elif line.startswith('SwapTotal:'):

                vmem_total = int(line.split()[1])

            elif line.startswith('SwapFree:'):

                vmem_free = int(line.split()[1])

            else:

                continue

        f.close()

    except:

        return None

    physical_percent = usage_percent(mem_total - (mem_free + mem_buffer + mem_cache), mem_total)

    virtual_percent = 0

    if vmem_total > 0:

        virtual_percent = usage_percent((vmem_total - vmem_free), vmem_total)

    return physical_percent, virtual_percent

def usage_percent(use, total):

    try:

        ret = (float(use) / total) * 100

    except ZeroDivisionError:

        raise Exception("ERROR - zero division error")

    return ret

statvfs = os.statvfs('/')

total_disk_space = statvfs.f_frsize * statvfs.f_blocks

free_disk_space = statvfs.f_frsize * statvfs.f_bfree

disk_usage = (total_disk_space - free_disk_space) * 100.0 / total_disk_space

disk_usage = int(disk_usage)

disk_tip = "硬盘空间使用率（最大100%）："+str(disk_usage)+"%"

print(disk_tip)

mem_usage = get_mem_usage_percent()

mem_usage = int(mem_usage[0])

mem_tip = "物理内存使用率（最大100%）："+str(mem_usage)+"%"

print(mem_tip)

cpu_usage = int(get_cpu()*100)

cpu_tip = "CPU使用率（最大100%）："+str(cpu_usage)+"%"

print(cpu_tip)

load_average = os.getloadavg()

load_tip = "系统负载（三个数值中有一个超过3就是高）："+str(load_average)

print(load_tip)