import platform
import subprocess
import fileinput


def get_mac_cpu_speed():
    commond = 'system_profiler SPHardwareDataType | grep "Processor Speed" | cut -d ":" -f2'
    proc = subprocess.Popen([commond], shell=True, stdout=subprocess.PIPE)
    output = proc.communicate()[0]
    output = output.decode()   # bytes 转str
    speed = output.lstrip().rstrip('\n')
    return speed


def get_linux_cpu_speed():
    for line in fileinput.input('/proc/cpuinfo'):
        if 'MHz' in line:
            value = line.split(':')[1].strip()
            value = float(value)
            speed = round(value / 1024, 1)
            return "{speed} GHz".format(speed=speed)


def get_windows_cpu_speed():
    import winreg
    key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r"HARDWARE\DESCRIPTION\System\CentralProcessor\0")
    speed, type = winreg.QueryValueEx(key, "~MHz")
    speed = round(float(speed)/1024, 1)
    return "{speed} GHz".format(speed=speed)


def get_cpu_speed():
    osname = platform.system()  # 获取操作系统的名称
    speed = ''
    if osname == "Darwin":
        speed = get_mac_cpu_speed()
    if osname == "Linux":
        speed = get_linux_cpu_speed()
    if osname in ["Windows", "Win32"]:
        speed = get_windows_cpu_speed()

    return speed

# print(get_cpu_speed())

import psutil
# CPU逻辑数量
# print(psutil.cpu_count())
# CPU物理核心
# print(psutil.cpu_count(logical=False))
# print(psutil.cpu_percent(interval=1, percpu=True))
#
# print(psutil.virtual_memory())
# print(psutil.virtual_memory().percent)#获取内存使用率
# print(psutil.swap_memory())
# print(psutil.disk_partitions()) # 磁盘分区信息
# print(psutil.disk_usage('/')) # 磁盘使用情况
# print(psutil.disk_io_counters()) # 磁盘IO


print(len(psutil.pids()))