Удаление существующих raid-ов и lvm-ов

import re
import subprocess
import os

def main():
    clear_raids()
    clear_lvm()

def clear_raids():
    raids = str(subprocess.check_output('cat /proc/mdstat', shell=True))
    cock = raids.find('md')
    my_raids = raids[cock:]
    new_raids = my_raids.split('[U' or '[_')
    for string in new_raids:
        md = re.findall(r'(md\d+)', string)
        os.system('mdadm -S /dev/' + ''.join(md))
    raid = re.findall(r'(\w+\[\d+\])', my_raids)
    names = re.findall(r'[a-zA-Z]+', ''.join(raid))
    for name in names:
        sname = ''.join(name)
        os.system('mdadm --zero-superblock /dev/' + sname)
def clear_lvm():

    lvms = str(subprocess.check_output('pvdisplay', shell=True))
    new_lvms = lvms.split('--- Physical volume ---')
    for lvm in new_lvms:
        #pv_name = re.findall(r'/\w+/\w+',lvm)
        VG_name=lvm.find('VG Name')
        PV_size = lvm.find('PV Size')
        my_lvm = lvm[VG_name:PV_size]
        lvm_name=re.findall(r'(\w+\\n)', ''.join(my_lvm))
        slvm = ''.join(lvm_name).strip('\\n')
        os.system('lvremove '+slvm)
        os.system('vgremove '+slvm)


if __name__ == '__main__':
    main()