如何修复python 3中的“ValueError:cannothaveunbufferedtexti/O”？

Question

这是麻省理工学院python项目的一个问题，但它基本上是为python 2.x用户编写的，所以有没有办法修复以下代码，以便在最新的python 3中运行？

当前代码正在引发“ValueError:不能有无缓冲文本I/O”

WORDLIST_FILENAME = "words.txt"

def load_words():

    print("Loading word list from file...")

    inFile = open(WORDLIST_FILENAME, 'r', 0)
    # wordlist: list of strings
    wordlist = []
    for line in inFile:
        wordlist.append(line.strip().lower())
    print("  ", len(wordlist), "words loaded.")
    return wordlist

Answer 1

我可以使用this answer中的代码来克服此错误：

class Unbuffered(object):
    def __init__(self, stream):
        self.stream = stream

    def write(self, data):
        self.stream.write(data)
        self.stream.flush()

    def writelines(self, datas):
        self.stream.writelines(datas)
        self.stream.flush()

    def __getattr__(self, attr):
        return getattr(self.stream, attr)

import sys
sys.stdout = Unbuffered(sys.stdout)

Answer 2

来自open的docstring：

... buffering is an optional integer used to set the buffering policy. Pass 0 to switch buffering off (only allowed in binary mode) ...

所以改变inFile = open(WORDLIST_FILENAME, 'r', 0)

到

inFile = open(WORDLIST_FILENAME, 'r')，或

如果你真的需要的话（我怀疑）。