Python列表索引超出范围，仅限于大规模迭代

Question

我有一个很大的文本文件，
其中每一行都是根据define语法（这是用regex处理的）。你知道吗

我得到以下错误：

remainder = '{} {} '.format(*pieces[-1])
IndexError: list index out of range

在此代码上：

def open_delimited(filename, args):
    with open(filename, args, encoding="UTF-16") as infile:
        chunksize = 10000
        remainder = ''
        for chunk in iter(lambda: infile.read(chunksize), ''):
            pieces = re.findall(r"(\d+)\s+(\d+_\d+)\s+(((post)\s+1)|((\d+_\d+_\d+)\s+(comment)\s+2))(.+)(\d{4}-\d{2}-\d{2})\s+(\d{2}:\d{2}:\d{2})(.*)", remainder + chunk, re.IGNORECASE)
            for piece in pieces[:-1]:
                yield piece
            remainder = '{} {} '.format(*pieces[-1])
        if remainder:
            yield remainder


filename = 'data/AllData_2000001_3000000.txt'

for chunk in open_delimited(filename, 'r'): 
    for j in range(len(chunk)):
        print(chunk[j])

当我限制迭代次数时，代码运行良好。你知道吗

i = 0
for chunk in open_delimited(filename, 'r'): 
    if (i <= 1000):
        for j in range(len(chunk)):
            print(chunk[j])
    else:
        break
    i += 1

Answer 1

有没有可能pieces是空的？你知道吗

>>> [][-1]
IndexError: list index out of range

我最好的猜测是re.findall有时找不到任何东西。你知道吗