Need Help with an Antivirus script in py3

[RandoomDude]

my question here:This is a basic av script in py3
>my os is windows 7 -32
>my python ver is 3.6
>i uses the standard python shell
>when i tried to run the script,it worked but when i typed the filename to scan it showed this error
>i typed in "C:\windows

Error:
SyntaxError: unexpected character after line continuation character

def scan(pathname, signatures, depth):
    for item in os.listdir(pathname) and depth > 0:
        n = os.path.join(pathname, item)
        try:
            scan(n, signatures, depth-1)
        except:
            f = open(n, 'r')
            s = f.read()
            for virus in signatures:
                if s.find(signatures[virus]) > 0:
                    print('{}, found virus {}'.format(n,virus))
            f.close()

>Hope you guys will help me