Remove executables recursively in Linux (using Python)

#!/usr/bin/env python2
# -*- coding: utf-8 -*-

import os
import sys

total_count = 0
files = []
exec_size = 0
total_size = 0

desired_type = 'x-executable; charset=binary'

def check(path):
    global total_count, exec_size, total_size

    total_count += 1
    size = os.stat(path).st_size
    total_size += size
    cmd = "file -i '%s' | grep '%s' > /dev/null"
    if not os.system(cmd % (path, desired_type)):
        files.append(path)
        exec_size += size
        print path

def find(directory):
    for name in os.listdir(directory):
        path = os.path.join(directory, name)
        if os.path.isdir(path):
            find(path)
        elif os.path.isfile(path):
            check(path)

base = 1024 ** 2

print '[*] Search for files...'
directory = sys.argv[1] if len(sys.argv) >= 2 else os.path.curdir
find(directory)
label = '[*] Directory contains %s files (total size %.1lf Mb)'
print label % (total_count, total_size / float(base))
label = '[?] Are you sure to remove %s files (total size %.1lf Mb)? [yes/no]'
print label % (len(files), exec_size / float(base))
if raw_input() == 'yes':
    for path in files:
        os.remove(path)
    print '[+] Operation complete'
else:
    print '[*] Operation canceled'