words and chars in text file

from os import listdir, path, getcwd

def count_words(texto):
    return len(texto.split())

def count_chars(texto):
    return len(list(texto))

def main():
    files = [f for f in listdir(getcwd()) if f.endswith('.txt')]
    for file in files:
        print(" START ".center(80, 'x'))
        total_chars, total_words = 0, 0
        with open(file) as f:
            lines = f.readlines()
            for line in lines:
                total_chars += count_chars(line)
                total_words += count_words(line)
        print("(%s) Total characteres: %d\n(%s) Total words: %s\n" % (file, total_chars, file, total_words))
        print(' END '.center(80, 'x'))

if __name__ == '__main__':
    main()