Insert a sys.stdout.flush() before the close(1) statement to make sure the redirect 'file' file gets the output. Also, you can use a tempfile.mkstemp() file in place. This article explains the new features in Python 3.4, compared to 3.3. Python 3.4 was released on March 16, 2014. For full details, see the changelog. In a more real life situation (for example with file objects to write to), this can be very handy and keeps you code cleaner and more human readable. This is Ferry Boender's weblog, where he talks about programming, computers, books, science, and everything else. Text of all posts under this license.
Redirect stdout to a file in Python? There is contextlib. Python 3. 4: from contextlib import redirect_stdout. It is similar to: import sys. Python versions. The latter version is not reusable. It can be made one if desired.
It doesn't redirect the stdout at the file descriptors level e. To redirect at the file descriptor level, os. Value. Error("Expected a file (`. None). if stdout is None. NOTE: `copied` is inheritable on Windows when duplicating a standard stream. Value. Error: # filename. NOTE: dup. 2 makes stdout_fd inheritable unconditionally.
The same example works now if stdout_redirected() is used instead of redirect_stdout(): import os. The output that previously was printed on stdout now goes to output. Note: stdout. flush() does not flush. C stdio buffers on Python 3 where I/O is implemented directly on read()/write() system calls. To flush all open C stdio output streams, you could call libc.
None) explicitly if some C extension uses stdio- based I/O: try. Import. Error. libc = None. Windows. except OSError. Load. Library(find_library('c')).
None). stream. flush(). Attribute. Error, Value. Error, IOError). pass # unsupported.
Pythonのprint文についてご紹介します。 print '文字列' Pythonで文字列を出力する、といえばprint文です。といっても、print文は. The most obvious way to do this would be to print to a file object: f = open('out.txt', 'w') print >> f, 'Filename:', filename # or f.write('.\n') f.close().
You could use stdout parameter to redirect other streams, not only sys. Example: from __future__ import print_function. Note: stdout_redirected() mixes buffered I/O (sys. I/O (operations on file descriptors directly). Beware, there could be bufferingissues. To answer, your edit: you could use python- daemon to daemonize your script and use logging module (as @erikb.
Python script that you run using nohup now.