Hi ! Another method : import os print str(os.popen4('dir C:\ /AD |find "octets"|find "libre"')[1].readlines()[0].split()[2]) Warning ! It's French version. For english, perhaps (depend of DIR return format) : import os print str(os.popen4('dir C:\ /AD |find "bytes"|find "free"')[1].readlines()[0].split()[2]) @-salutations Michel Claveau