python在windows系统上获取CPU占用率

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import subprocess
import re
def get_cpu_usage():
    # 执行 WMIC 命令并获取 CPU 占用率
    cpu_usage_info = subprocess.check_output("wmic cpu get loadpercentage", shell=True).decode()
    # 使用正则表达式提取 CPU 占用率的数值
    cpu_usage_match = re.search(r'([0-9]+)', cpu_usage_info)
    if cpu_usage_match:
        cpu_usage = int(cpu_usage_match.group(1))
        return str(cpu_usage)+'%'
    else:
        print("Failed to extract CPU usage information.提取CPU使用率信息失败.")
        return None

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