在Python2中从sys.stdin制作io.BufferedReader
如何从标准文件对象（例如 sys.stdin 或从“打开”中获得的内容）创建 BufferedReader 对象？
（背景：我需要一个 peek() 方法，标准文件对象无法拥有该方法。也欢迎任何解决此问题的建议。）
我本来希望它能起作用，但事实并非如此：（
>>> 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）
哈，明白了，至少对于任何有文件描述符的东西来说是这样。
stream = sys.stdin, or open(...), etc.
reader = io.open(stream.fileno(), mode='rb', closefd=False)
How can I make a BufferedReader object from a standard file object, like sys.stdin or what you get from 'open'?
(Background: I need a peek() method, which the standard file objects fail at having. Any suggestions to solve this issue are also welcome.)
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'
(This is Python 2.7)
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)
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不久前，我也出于同样的原因（使用
.peek()）寻找相同的代码。这有效：I was also looking for the same code for the same reason (using
.peek()) a while ago. And this works: