在Python2中从sys.stdin制作io.BufferedReader [英] Making io.BufferedReader from sys.stdin in Python2

问题描述

如何从标准文件对象（例如sys.stdin或从 open中获得的文件）中创建BufferedReader对象？

How can I make a BufferedReader object from a standard file object, like sys.stdin or what you get from 'open'?

（背景：我需要一个peek（）方法，这是标准文件对象无法使用的方法。也欢迎您解决此问题的任何建议。）

(Background: I need a peek() method, which the standard file objects fail at having. Any suggestions to solve this issue are also welcome.)

我希望这种方法能正常工作，但没有：

I'd have sort of expected this to work, but it doesn't:

>>> import sys  
>>> import io
>>> io.BufferedReader(sys.stdin)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'file' object has no attribute 'readable'

（这是Python 2.7 ）

(This is Python 2.7)

哈哈，至少对于有文件描述符的任何东西都可以。

Hah, got it, at least for anything that has a file descriptor.

stream = sys.stdin, or open(...), etc.
reader = io.open(stream.fileno(), mode='rb', closefd=False)

推荐答案

出于相同的原因，我也在寻找相同的代码（使用偷看）。这可行：

I was also looking for the same code for the same reason (using peek) awhile ago. And this works:

reader = io.open(sys.stdin.fileno())

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