Python 3 csv.reader empty response

Question

你好，我得到了以下代码，但循环不起作用，因为csv.reader是空的。带有csv数据的文件已正确打开。

为了理解：var pokemon可以是字符串形式的任何pokemon名称。bot、logger和event是Hangoutsbot的vars组合。所有需要的库都已加载。

代码：

def pkmn_translate(bot, event, pokemon):
    logger.info("translating pokemon name")
    url = "https://raw.githubusercontent.com/PokeAPI/pokeapi/master/data/v2/csv/pokemon_species_names.csv"
    request = urllib.request.Request(url, headers = {"User-agent":"Mozilla/5.0", "Accept-Charset":"utf-8"})
    try:
        data = urllib.request.urlopen(request)
        csv_data = data.read()
        csvstr = str(csv_data).strip("b'")
        lines = csvstr.split("\n")
        f = open('{}/pokemon_species_names.csv'.format(os.path.dirname(os.path.realpath(__file__))), "w",encoding='utf8')
        for line in lines:
            f.write(line + "n")
        f.close()
        logger.info("translating db saved")
    except urllib.error.URLError as e:
        logger.info("{}: Error: {}".format(event.user.full_name, json.loads(e.read().decode("utf8","ignore"))['detail']))
        yield from bot.coro_send_message(event.conv, "{}: Error: {}".format(event.user.full_name, json.loads(e.read().decode("utf8","ignore"))['detail']))
        return
    pokemon_id = "default"
    f = open('{}/pokemon_species_names.csv'.format(os.path.dirname(os.path.realpath(__file__))), 'r', encoding='utf8') # opens the csv file
    try:
        logger.info("DEBUG: openFile")
        #Quick and dirty fix because CSV File is very big
        maxInt = sys.maxsize
        decrement = True
        while decrement:
            # decrease the maxInt value by factor 10
            # as long as the OverflowError occurs.
            decrement = False
            try:
                csv.field_size_limit(maxInt)
            except OverflowError:
                maxInt = int(maxInt/10)
                decrement = True
        logger.info("DEBUG: maxInt = {}".format(maxInt))
        reader = csv.reader(f)
        rows = list(reader)
        for row in reader:
            logger.info("DEBUG: row = {}".format(row))
            for column in row:
                if pokemon == column:
                    #DEBUG
                    logger.info("Info: row =  {}".format(row))
                    #SET VAR
                    pokemon_id = rows[row][0]
                    #DEBUG
                    logger.info("Info: {}".format(pokemon_id))
                    bot.coro_send_message(event.conv, "Info: {}".format(pokemon_id))
                else:
                    logger.info("Error: Name not in File!")
                    bot.coro_send_message(event.conv, "Error: Name not in File!")
            else:
                logger.info("DEBUG: Loop exited")
        else:
            logger.info("DEBUG: Loop exited")
    except:
        logger.info("Debug: Some error")
    finally:
        f.close()      # closing
    logger.info("Debug func: PokemonID = {}".format(pokemon_id))
    yield from pokemon_id
    return pokemon_id

在for循环中，reader变量中没有数据，因此失败。我不知道如何让csv.reader工作。附言：我完全不懂蟒蛇。

Answer 1

您的list(reader)调用消耗读取器，该读取器在for循环中为空。

只需更换

    reader = csv.reader(f)
    rows = list(reader)
    for row in reader:

通过

    reader = csv.reader(f)
    rows = list(reader)
    for row in rows: