How to only get files without extensions?

My problem is to get ONLY files without extensions.
I mean – I have a dictionary and there are some files without extensions and some files with extensions (.xml, .csv, etc)

I want that my code would only read files without extensions.

Now, it’s reading every file in the dictionary "Dir".

path = 'C:/Users/STJ2TW/Desktop/Dir/'
for filename in os.listdir(path):
    fullname = os.path.join(path, filename)

Thanks in advance!

>Solution :

If there are no dots in your files, you can do :

path = 'C:/Users/STJ2TW/Desktop/Dir/'
for filename in os.listdir(path):
    if '.' not in filename:
        fullname = os.path.join(path, filename)