def get_fileName(cur_dir, file_sufix):
    filenames = [name for name in os.listdir(cur_dir) if name.endswith(file_sufix)]
    if (len(filenames) > 0):
        return filenames[0]
    else:
        return None
def get_fileName(cur_dir, file_sufix):
    filenames = [name for name in os.listdir(cur_dir) if name.endswith(file_sufix)]
    if (len(filenames) > 0):
        return filenames[0]
    else:
        return None