List only files in a directory?

This is a simple generator expression:

files = (file for file in os.listdir(path) 
         if os.path.isfile(os.path.join(path, file)))
for file in files: # You could shorten this to one line, but it runs on a bit.
    ...

Or you could make a generator function if it suited you better:

def files(path):
    for file in os.listdir(path):
        if os.path.isfile(os.path.join(path, file)):
            yield file

Then simply:

for file in files(path):
    ...