在Python3中，以二进制模式打开文件会得到bytes的结果。迭代一个bytes对象可以得到0到255(包括0到255)的整数，而不是字符。从^{} documentation：While bytes literals and representations are based on ASCII text, bytes objects actually behave like immutable sequences of integers, with each value in the sequence restricted such that 0 <= x < 256

将string.printable转换为一个集合，并对其进行测试：printable = {ord(c) for c in string.printable}

以及

^{pr2}$

接下来，您希望附加到bytesarray()对象以保持合理的性能，并从ASCII解码以产生str结果：printable = {ord(c) for c in string.printable}

with open(filename, "rb") as f:

result = bytearray()

for c in f.read():

if c in printable:

result.append(c)

continue

if len(result) >= min:

yield result.decode('ASCII')

result.clear()

if len(result) >= min: # catch result at EOF

yield result

与逐个迭代字节不同，您可以对任何可打印的而不是进行拆分：import re

nonprintable = re.compile(b'[^%s]+' % re.escape(string.printable.encode('ascii')))

with open(filename, "rb") as f:

for result in nonprintable.split(f.read()):

if result:

yield result.decode('ASCII')

我会尝试将文件分块读取，而不是一次性读取；不要试图一次性将大文件放入内存中：with open(filename, "rb") as f:

buffer = b''

for chunk in iter(lambda: f.read(2048), b''):

splitresult = nonprintable.split(buffer + chunk)

buffer = splitresult.pop()

for string in splitresult:

if string:

yield string.decode('ascii')

if buffer:

yield buffer.decode('ascii')

缓冲区将任何不完整的单词从一个块带到下一个块；re.split()如果输入分别以不可打印字符开始或结束，则在开始和结束处生成空值。在