os.walk

import os

#ret = []
#for (root, dirs, files) in os.walk('.'):
#    for dir in dirs:
#        if '.' in dir:
#            ret.append(os.path.join(root, dir))


def find_files(topdir):
    for (root, dirs, files) in os.walk(topdir):
        for file in files:
            path = os.path.join(root, file)
            if os.path.isfile(path):
                yield path

for file in find_files('.'):
    print(file)