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How to abstract stdin/stdout and files?


How to abstract stdin/stdout and files?

By : soundphury
Date : November 21 2020, 03:00 PM
fixed the issue. Will look into that further I think you would need to do this way. You don't need to make run() itself a @contextmanager—all it needs to do is use one (or more, and both fileinput.input and redirect_stdout are ones already). I'm not sure why you're using fileinput.input since there appears to only be one input file involved.
code :
from contextlib import redirect_stdout
import fileinput
import sys

def foo(file):
    return ''.join([line for line in file])

def run(input_file, output_file):
    stdin = '-' if input_file is None else input_file
    stdout = sys.stdout if output_file is None else open(output_file, 'w')
    with fileinput.input(stdin) as stdin, redirect_stdout(stdout):
        print(foo(stdin))

run('input.txt', 'output.txt')
run('input.txt', None)


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Are stdin, stdout, and stderr Files?

Are stdin, stdout, and stderr Files?


By : Сергей Струк
Date : March 29 2020, 07:55 AM
wish helps you On POSIX systems, streams are special file descriptors. Windows has its own err.. thing, but they are file descriptors there as well. Examples of special files on Windows are the standard streams stdout, stdin and stderr, as well as serial ports like COMn, which can be opened with OpenFile(). On Linux, special files are found under /proc and /dev. /proc/cpuinfo will read back information about your CPU. /dev/sdX are handles to your physical disks, etc.
So what's a special file? It's a file handle, but the contents isn't stored on disk. The file handle is just an interface to the kernel. On POSIX systems you use open(), close(), read(), write(), and ioctl() to talk to the kernel via the file descriptor. Even a file descriptor to the whole memory map is available, under /dev/mem. You open this and pass to mmap() if you want to map a memory region for example.
execute a bash command on a list of files on stdin and redirect the stdout to related files

execute a bash command on a list of files on stdin and redirect the stdout to related files


By : Lior A
Date : March 29 2020, 07:55 AM
Why are stdin and stdout considered files in C?

Why are stdin and stdout considered files in C?


By : user3461888
Date : March 29 2020, 07:55 AM
should help you out C stdio functions operate on streams, not files. As far as your code is concerned, a stream is simply a consumer (output stream) or producer (input stream) of bytes.
A stream may be associated with a file on disk. It may also be associated with a terminal. Or a printer. Or a network socket. Or anything else that you might want to communicate with. A stream is an abstraction of anything that can read or write a string of bytes.
GDB/MI redirect stdin and stdout to files

GDB/MI redirect stdin and stdout to files


By : D.Yao
Date : March 29 2020, 07:55 AM
I hope this helps you . I found the solution. Its is possible to use MI GDB commands together with GDB commands. So if i need to forward stdin and stdout to file i can do it like this:
-file-exec-and-symbols //readfile to debug -break-insert main //set breakpoint at main function (or anywhere esle) run < input.txt > output.txt //forward stdin and stdout to files -exec-run //start debugging
Using files as stdin and stdout for subprocess

Using files as stdin and stdout for subprocess


By : Abderrahman Ziani
Date : March 29 2020, 07:55 AM
I hope this helps you . How do I replicate the following batch command using python subprocess module? , The following should work:
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