在windows python3中将stdin作为二进制文件读取

Question

I have a code to read stdin as binary file in linux:

#! /usr/bin/python3
stdin_file = '/dev/stdin'
def read_input():
    with open(stdin_file, mode='rb') as f:
        while True:
            inp = f.read(4)
            if not inp: break
            print('got :' , inp)

read_input()

what could be its alternative for windows OS? I dont want to use sys.stdin.buffer.read() Consider it as it is compulsary for me to use it like open(file_name)

Answer 1

sys.stdin , sys.stdout , and sys.stderr each have a fileno() method which returns their file descriptor number. (0, 1, and 2)

In python you can use the buffer's fileno as the path destination for open .

Also, as @eryksun mentioned, you probably want to pass closefd=False when calling open so the underlying file descriptor for sys.stdin isn't closed when exiting the with block.

For example:

import sys

fileno = sys.stdin.fileno()
print(fileno)
# prints 0

# Open stdin's file descriptor number as a file.
with open(fileno, "rb", closefd=False) as f:
    while True:
        inp = f.read(4)
        if not inp:
            break
        print("Got:", inp)

Answer 2

A good option is to use the .buffer member of the stream to get access to a binary version:

stdin_buffer = sys.stdin.buffer
def read_input():
    while True:
        inp = stdin_buffer.read(4)
        if not inp: break
        print('got :' , inp)

I now see you wrote in the question "I dont want to use sys.stdin.buffer.read() " but still decided to post this answer because, for many other people that come across this question, that is actually the best solution and it's very easy to miss the brief mention of it in your question (which is exactly what happened to me!). Is there any reason that wouldn't work for you?