Databases
StackOverflow2013
Postsdbo
POPython subprocess.check_call - how to direct stdout and stderr to _both_ screen and log file?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPython subprocess.check_call - how to direct stdout and stderr to _both_ screen and log file?
    primarykey
    data
    text
    <p>I use Python 2.7. This is what I'm doing currently to launch other programs from Python, redirecting STDOUT and STERR to LOGFILE:</p> <pre><code> try: # Execute command and print content to LOGFILE tempname = os.path.abspath('./text.txt') TEMPFILE = open(tempname, 'wb') print 'Executing: ', command subprocess.check_call(command, shell = True, stdout = TEMPFILE, stderr = TEMPFILE) TEMPFILE.close() LOGFILE.write(open(tempname, 'rU').read()) LOGFILE.close() os.remove(tempname) except Exception as errmsg: # If fails then print errors to LOGFILE TEMPFILE.close() LOGFILE.write(open(tempname, 'rU').read()) os.remove(tempname) print messages.crit_error_bad_command % command, '\n', str(errmsg) print &gt;&gt; LOGFILE, messages.crit_error_bad_command % command, '\n', str(errmsg) LOGFILE.close() </code></pre> <p>First of all, I wasn't sure my above script was the best solution. I had to use a temp file because I want to capture the log even in the case the subprocess.check_call call fails. If you have ideas how to improve the above script I'd appreciate it.</p> <p>Moreover, I would like to change this so that STDOUT and STDERR should go to the screen as normal AND also to the log file. How do I do this? Note that if I don't specify STDOUT, I'll see things like "There is an error, do you wish to continue [y/n]?" on the screen and then I can react to it. Right now since everything goes to the log, I do not see anything on the screen. The answer to my question here should help resolve this case.</p> <p>Thanks. </p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USLinh
    1. USLinh
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POPython subprocess.check_call - how to direct stdout and stderr to _both_ screen and log file?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POPython subprocess.check_call - how to direct stdout and stderr to _both_ screen and log file?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhat about using the [logging](http://docs.python.org/library/logging.html) module?
      singulars
      1. POPython subprocess.check_call - how to direct stdout and stderr to _both_ screen and log file?
      1. USbrandizzi
    2. COYou can use `subprocess Popen.communicate()`, which returns `stdout,stderr`. That way you can do whatever you want to it (log it, print it)
      singulars
      1. POPython subprocess.check_call - how to direct stdout and stderr to _both_ screen and log file?
      1. USTJD
    3. COTo further add to @TJD, check_call is a convenience method. Its too limited for this case, which is why you should be using a Popen object
      singulars
      1. POPython subprocess.check_call - how to direct stdout and stderr to _both_ screen and log file?
      1. USjdi
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload