python Word-Counter.py [parameter] [filename] 

def Char_Count(filename):
    #字符数统计
    charcount = 0
    try:
        with open(filename, encoding = ‘utf-8‘) as fi:
            for x in fi:
                match = re.findall(r‘[\s]+‘, x)
                for i in match:
                    x = x.replace(i, ‘‘)
                charcount += len(x)
        return charcount
    except IOError:
        print("Failed to open the file,please check if the path is correct.")

def Word_Count(filename, encoding = ‘utf-8‘):
    #单词数统计
    wordcount = 0
    try:
        with open(filename) as fi:
            for x in fi:
                match = re.findall(r‘[a-zA-Z-\‘]+‘,x)
                wordcount += len(match)
        return wordcount
    except IOError:
        print("Failed to open the file,please check if the path is correct.")

def Line_Count(filename, encoding = ‘utf-8‘):
    #行数统计
    linecount = 0
    try:
        with open(filename) as fi:
            for x in fi:
                linecount += 1
        return linecount
    except IOError:
        print("Failed to open the file,please check if the path is correct.")

if __name__==‘__main__‘:
    #主函数
    print(‘Word-Counter starts working...‘)
    print(‘--------------------------------‘)
    parser = argparse.ArgumentParser(description="This is a Word-Counter.")
    parser.add_argument("-c", metavar = "--character", dest = "char_arg", help = "Return number of characters.")
    parser.add_argument("-w", metavar = "--word", dest = "word_arg", help = "Return number of words.")
    parser.add_argument("-l", metavar = "--line", dest = "line_arg", help = "Return number of lines.")
    args = parser.parse_args()
    if args.char_arg:
        charcount = Char_Count(args.char_arg)
        print("Number of characters:%s" % (charcount))
    if args.word_arg:
        wordcount = Word_Count(args.word_arg)
        print("Number of words:%s" % (wordcount))
    if args.line_arg:
        linecount = Line_Count(args.line_arg)
        print("Number of lines:%s" % (linecount))