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Redirect Standard Error To File Python

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you, helping each other. Join them; it only takes a minute: Sign up Temporarily Redirect stdout/stderr up vote 43 down vote favorite 16 Is it possible to temporarily redirect stdout/stderr in Python (i.e. for the duration of a

Python Redirect Stderr To String

method)? Edit: The problem with the current solutions (which I at first remembered but then forgot) is that they don't redirect; rather, they just replace the streams in their entirety. Hence, if a method has a local copy of one the variable for any reason (e.g. because the stream was passed as a parameter to something), it won't work. Any solutions? python redirect stdout stderr share|improve this question edited Nov 21 '14 at 19:10 asked Jul python redirect stdout to string 22 '11 at 21:49 Mehrdad 104k65311622 2 Redirecting stdout/stderr isn't uncommon (or, at least, not unheard of) — the answers here explain the process nicely. –David Wolever Jul 22 '11 at 22:08 2 @TokenMacGuy: while you should never write library code that has outputs to stderr or stdout wired-in, you can't always avoid using that kind of code. –Fred Foo Jul 22 '11 at 22:12 @Mehrdad Try replacing sys.__stdout__ first thing in your code, before you import the third-party modules –Rob Cowie Jul 22 '11 at 23:33 @Rob: I think you missed the 2nd word in my title. :-) –Mehrdad Jul 22 '11 at 23:35 @Mehrdad Nope. Replace sys.__stdout__ early in your code with your own stream-like object (i.e. implements .write()). All references to sys.stdout point to it. Have it proxy to a changeable stream, defaulting to stdout. You should then have the ability to switch the proxied stream at will. I haven't tried this; I'm thinking out loud. –Rob Cowie Jul 22 '11 at 23:42 | show 4 more comments 6 Answers 6 active oldest votes up vote 10 down vote accepted To solve the issue that some function might have cached sys.stdout stream as a local variable and therefore replacing the global sys.stdout won't work inside that function, you could redirect at a file des

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the python redirect stdout to file workings and policies of this site About Us Learn more about Stack python stderr to logging Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs python logging stderr to file Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.3 million programmers, just like you, helping each other. Join http://stackoverflow.com/questions/6796492/temporarily-redirect-stdout-stderr them; it only takes a minute: Sign up Python - How to redirect stderr to a file? up vote 0 down vote favorite 1 The following code I got from http://forums.devshed.com/python-programming-11/redirect-stdout-stderr-file-500952.html which tells how to redirect a stderr to a file. I tried it but the error message is not getting saved to the file. While I am not using http://stackoverflow.com/questions/33500220/python-how-to-redirect-stderr-to-a-file sys.stderr = file_err the error is displayed in the idle terminal, when I am assigning file_err to sys.stderr the error is not displayed in the idle terminal, and it is not being copied to the file_name.log import sys original_stderr = sys.stderr file_err = open('file_name.log', 'w') # I tried with .txt also sys.stderr = file_err print(list[file]) # Used to create a NameError sys.stderr = original_stderr file_err.close() Am I supposed to write it to the file or is there an error in the program? python share|improve this question edited Nov 5 '15 at 3:05 asked Nov 3 '15 at 13:21 Jeril 350113 1 This code snippet prints a Traceback error in the file_name.log on my machine. What happens at yours ? What do you expect to happen ? How do you run it ? –nos Nov 3 '15 at 13:25 Possible duplicate of Redirect the standard error output to /dev/null in python –skyking Nov 3 '15 at 13:36 What's wrong with redirecting stderr from your shell ? And if you want logging, there'

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sys.stdout to a stream or a file while executing some piece of code. However, simply "redirecting stdout" is sometimes not as easy as one would expect; hence the slightly strange title of this post. In particular, things become interesting when you want C code running within your Python process (including, but not limited to, Python modules implemented as C extensions) to also have its stdout redirected according to your wish. This turns out to be tricky and leads us into the interesting world of file descriptors, buffers and system calls. But let's start with the basics. Pure Python The simplest case arises when the underlying Python code writes to stdout, whether by calling print, sys.stdout.write or some equivalent method. If the code you have does all its printing from Python, redirection is very easy. With Python 3.4 we even have a built-in tool in the standard library for this purpose - contextlib.redirect_stdout. Here's how to use it: from contextlib import redirect_stdout f = io.StringIO() with redirect_stdout(f): print('foobar') print(12) print('Got stdout: "{0}"'.format(f.getvalue())) When this code runs, the actual print calls within the with block don't emit anything to the screen, and you'll see their output captured by in the stream f. Incidentally, note how perfect the with statement is for this goal - everything within the block gets redirected; once the block is done, things are cleaned up for you and redirection stops. If you're stuck on an older and uncool Python, prior to 3.4 [1], what then? Well, redirect_stdout is really easy to implement on your own. I'll change its name slightly to avoid confusion: from contextlib import contextmanager @contextmanager def stdout_redirector(stream): old_stdout = sys.stdout sys.stdout = stream try: yield finally: sys.stdout = old_stdout So we're back in the game: f = io.StringIO() with stdout_redirector(f): print('foobar') print(12) print('Got stdout: "{0}"'.format(f.getvalue())) Redirecting C-level streams Now, let's take our shiny redirector for a more challenging ride: import ctypes libc = ctypes.CDLL(None) f = io.StringIO() with stdout_redirector(f): print('foobar') print(12) libc.puts(b'

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