hi i have a problem with this tester, i wrote this code to open my file within a directory(topdirectory) of which in theory it would open the directory and within it will open all the files within that directory, but whenever i run it, it will open the directory but not open any of the files within it. topdirectory = "./POSCARTEST/" print (topdirectory) def list_files_walk (start_path): fulllist = [] for root, dirs, files in os.walk(start_path): for file in files: fulllist.append(os.path.join(root, file)) return(fulllist) directory_path = topdirectory allfiles = list(list_files_walk(directory_path)) print(allfiles) Continue reading...