stdout

问题 I've spent about 6 hours on stack overflow, rewriting my python code and trying to get this to work. It just doesn't tho. No matter what I do. The goal: Getting the output of a subprocess to appear in real time in a tkinter text box. The issue: I can't figure out how to make the Popen work in real time. It seems to hang until the process is complete. (Run on its own, the process works completely as expected, so it's just this thing that has the error) Relevant code: import os import tkinter

问题 How to get \n printed to stdout on Windows? This code works in Python 2, but not with Python 3: # set sys.stdout to binary mode on Windows import sys, os, msvcrt msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY) # the length of testfile created with # python test_py3k_lf_print.py > testfile # below should be exactly 4 symbols (23 0A 23 0A) print("#\n#") 回答1: Python 3 already configures standard I/O in binary mode, but it has its own I/O implementation that does newline translation. Instead of

问题 This is a follow up question from here specifically concerning its answer. From a python module I am calling a Hello World executable that simply prints Hello World to the stdout. I am interested in redirecting that output to a python StringIO and ran into this answer which almost brings me all the way to the solution. The critical part of this answer is this code segment: 1. def redirect_stdout(): 2. print "Redirecting stdout" 3. sys.stdout.flush() # <--- important when redirecting to files

问题 I am trying to measure the execution time in seconds of an executable program invoked via subprocess. I do not want the output of the executable (either stderr or stdout) to be emitted. I have tried the timeit and resource libraries, but neither accurately captures the time of the process, seemingly it only captures the timing in the Python worker thread. This attempt below will lose the timing info b/c of the stderr redirect. However, w/o the stderr redirect, the command 'f_cmd' stderr

问题 NB. I have seen Log output of multiprocessing.Process - unfortunately, it doesn't answer this question. I am creating a child process (on windows) via multiprocessing. I want all of the child process's stdout and stderr output to be redirected to a log file, rather than appearing at the console. The only suggestion I have seen is for the child process to set sys.stdout to a file. However, this does not effectively redirect all stdout output, due to the behaviour of stdout redirection on

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Can I redirect the stdout in python into some sort of string buffer? I have a function in python that prints something to the standard output def foo(): print("some text") I want to 'redirect' the text that is being printed in this function into a variable, i.e. 'wrap' this function or whatever so that the text is stored in a variable: text = wrapper(foo) Is there a robust way to temporarily change sys.stdout or

问题 How do I redirect stderr and stdout to file for a Ruby script? 回答1: From within a Ruby script , you can redirect stdout and stderr with the IO#reopen method. # a.rb $stdout.reopen("out.txt", "w") $stderr.reopen("err.txt", "w") puts 'normal output' warn 'something to stderr' $ ls a.rb $ ruby a.rb $ ls a.rb err.txt out.txt $ cat err.txt something to stderr $ cat out.txt normal output 回答2: Note: reopening of the standard streams to /dev/null is a good old method of helping a process to become a

问题 I'm looking for a Python solution that will allow me to save the output of a command in a file without hiding it from the console. FYI: I'm asking about tee (as the Unix command line utility) and not the function with the same name from Python intertools module. Details Python solution (not calling tee , it is not available under Windows) I do not need to provide any input to stdin for called process I have no control over the called program. All I know is that it will output something to

问题 #include <stdio.h> int main() { printf("This goes to screen\n"); freopen("out.txt", "a", stdout); printf("This goes to out.txt"); freopen("/dev/stdout", "a", stdout); printf("This should go to screen too, but doesn't\n"); return 0; } I call freopen to redirect the stdout to out.txt then I print something on the file, now I want to redirect it back to the screen, but freopen("/dev/stdout", "a", stdout); doesn't work. Is there any way to do that using ANSI C or POSIX system calls? 回答1: I can't

问题 Is it possible to run an external process from Perl, capture its stderr, stdout AND the process exit code? I seem to be able to do combinations of these, e.g. use backticks to get stdout, IPC::Open3 to capture outputs, and system() to get exit codes. How do you capture stderr, stdout, and the exit code all at once? 回答1: If you reread the documentation for IPC::Open3, you'll see a note that you should call waitpid to reap the child process. Once you do this, the status should be available in $