Issue406280
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Created on 2001-03-06 13:06 by paul.moore, last changed 2022-04-10 16:03 by admin. This issue is now closed.
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msg3716 - (view) | Author: Paul Moore (paul.moore) * | Date: 2001-03-06 13:06 | |
Platform: Windows 2000, Python 2.1b1 The pydoc script works fine in "serve documents to a browser" mode (python pydoc). Also, running it as a command line application, as "python pydoc pydoc", works fine when the environment variable PAGER is unset. However, when I have PAGER=less, I get no output at all. It looks like a bug in pydoc.pipepager(), which is the result of a bug in os.popen(). I can work around the bug by using pydoc.tempfilepager() in place of pydoc.pipepager(), but I don't know what the underlying popen() bug is. To demonstrate the os.popen() bug, see the attached interactive session: C:\Data>python21 Python 2.1b1 (#11, Mar 2 2001, 11:23:29) [MSC 32 bit (Intel)] on win32 Type "copyright", "credits" or "license" for more information. >>> import os >>> a = os.popen("more", "w") >>> a.write("Hello") >>> a.close() Run this, and note that the "More" program never starts... |
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msg3717 - (view) | Author: Guido van Rossum (gvanrossum) * | Date: 2001-03-12 00:27 | |
Logged In: YES user_id=6380 Assigned to Tim, because of that fine combination of keywords: popen and Windows. |
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msg3718 - (view) | Author: Tim Peters (tim.peters) * | Date: 2001-03-17 04:30 | |
Logged In: YES user_id=31435 Assigned to MarkH for popen insight. "more" does start, but the output just vanishes under Win98SE (and, I assume, W2K too). This I deduced via doing os.popen("more > somefile.txt", "w") instead; the file is created, and does contain the stuff written to the handle. Besides, the std test_popen2 test uses "more" under Windows too, and works fine. Nothing unique about "more" here: tried a number of .exe files, and it's all the same: the stdout of the popen'ed program isn't displayed. I assume this is because the original console's stdout doesn't manage to become the popen'ed stdout, but I don't understand it in detail. Deep or shallow? In any case, trying to implement a pager via popen like this goes beyond what C guarantees, so I reduced the priority accordingly. |
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msg3719 - (view) | Author: Tim Peters (tim.peters) * | Date: 2001-04-09 05:10 | |
Logged In: YES user_id=31435 Reassigned to Ping since wrestling w/ popen() on Windows is hopeless. Left the priority low because it's gotta be rare for anyone to define a PAGER envar under Windows. Note that Paul mailed some kind of related patch to Python-Dev recently ... mumble, mumble, ... here: http://mail.python.org/pipermail/python-dev/2001- April/014070.html |
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msg3720 - (view) | Author: Ka-Ping Yee (ping) * | Date: 2001-04-13 12:48 | |
Logged In: YES user_id=45338 Fixed by always using temp files in Windows. New version is checked in. |
History | |||
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Date | User | Action | Args |
2022-04-10 16:03:49 | admin | set | github: 34075 |
2001-03-06 13:06:24 | paul.moore | create |