def chdir():
    pass

def getcwd():
    pass

def listdir():
    pass

def mkdir():
    pass

def remove():
    pass

def rename():
    pass

def rmdir():
    pass

sep = '/'
def stat():
    pass

def statvfs():
    pass

def sync():
    pass

def uname():
    pass

def unlink():
    pass

def urandom():
    pass

