Gentoo: Clean old kernel files located in /boot (genkernel) - Use at your own risk

kernelclean.py

#!/usr/bin/python3

import os
import re

os.chdir('/boot')

files=(os.listdir('/boot'))

keep = [
    'kernel',
    'kernel.old',
    'initramfs',
    'initramfs.old',
    'System.map',
    'System.map.old'
]

match = [
    r'^vmlinu[xz]\-',
    r'^initramfs\-',
    r'^System.map\-'
]

si = [
    'B',
    'kB',
    'MB',
    'GB',
    'TB',
    'PB',
    'EB'
]

for file in keep:
    if os.path.islink(file):
        keep.append(os.readlink(file))

files = list(set(files) - set(keep))
files.sort()

cleansize = 0
for file in files:
    delme = False
    for m in match:
        if re.search(m, file):
            delme = True
    if delme:
        print("[!!] " + file)
        cleansize += os.path.getsize(file)
        os.remove(file)
    else:
        print("[  ] " + file)

csiu = ""
csi = cleansize
for siu in si:
    if csi > 5:
        csiu = siu
        csi /= 1024

print("Cleaned " + str(round(csi * 1024)) + csiu)