[Tutor] No file or directory error using subprocess and Popen
Jim
jf_byrnes at comcast.net
Mon May 15 21:33:51 EDT 2017
On 05/15/2017 02:48 AM, Steven D'Aprano wrote:
> On Sun, May 14, 2017 at 10:57:57PM -0500, Jim wrote:
>> I am running this on Mint 18. This is the third script I have
>> written to open and position windows in workspaces. The first two
>> work, but trying to open ebook-viewe r (calibre) with a specific
>> book produces the following error. If I run the same command in the
>> terminal it works without an error.
>
> I think your problem is that you're telling subprocess to run a
> command called:
>
> ebook-viewer
> /home/jfb/Documents/eBooks/Javascript/GOOGLE_SHEETS/googlespreadsheetprogramming.epub
>
> with no arguments. What you want is a command called:
>
> ebook-viewer
>
> and a single argument:
>
> /home/jfb/Documents/eBooks/Javascript/GOOGLE_SHEETS/googlespreadsheetprogramming.epub
>
> I think (but haven't tried it) that the simplest way to fix that is
> to change the entry in self.programs from:
>
>> self.programs = ['jedit', 'google-chrome', 'doublecmd',
>> 'ebook-viewer
>> /home/jfb/Documents/eBooks/Javascript/GOOGLE_SHEETS/googlespreadsheetprogramming.epub']
>
>>
> to:
>
> path_to_file =
> '/home/jfb/Documents/eBooks/Javascript/GOOGLE_SHEETS/googlespreadsheetprogramming.epub'
>
>
self.programs = ['jedit',
> 'google-chrome', 'doublecmd', ['ebook-viewer', path_to_file], ]
I made the changes you suggested.
def __init__(self):
path_to_book =
'/home/jfb/Documents/eBooks/Javascript/GOOGLE_SHEETS/googlespreadsheetprogramming.epub'
self.programs = ['jedit', 'google-chrome', 'doublecmd',
['ebook-viewer', path_to_book ]]
self.classname = {'jedit' : 'sun-awt-X11-XFramePeer',
'google-chrome':'google-chrome',
'doublecmd':'doublecmd',
'calibre-ebook-viewer': 'libprs500'}
self.open_and_move()
I noticed you have a , between the last two ]],s. I don't think you
meant that but I tried it both ways just incase.
>
> and see if that fixes it. (It may not be enough, or the right
> approach, but at least you'll get a different error if it is wrong
> :-)
Unfortunately you are correct, I did get a different error message.
Exception in thread Thread-4:
Traceback (most recent call last):
File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
self.run()
File "/usr/lib/python3.5/threading.py", line 862, in run
self._target(*self._args, **self._kwargs)
File "/home/jfb/MyProgs/Scripts/place_windows_OO_WS3.py", line 24, in
open_it
subprocess.call([self.program])
File "/usr/lib/python3.5/subprocess.py", line 557, in call
with Popen(*popenargs, **kwargs) as p:
File "/usr/lib/python3.5/subprocess.py", line 947, in __init__
restore_signals, start_new_session)
File "/usr/lib/python3.5/subprocess.py", line 1474, in _execute_child
executable = os.fsencode(executable)
File "/usr/lib/python3.5/os.py", line 862, in fsencode
raise TypeError("expect bytes or str, not %s" %
type(filename).__name__)
TypeError: expect bytes or str, not list
Traceback (most recent call last):
File "/home/jfb/MyProgs/Scripts/place_windows_OO_WS3.py", line 78, in
<module>
Place()
File "/home/jfb/MyProgs/Scripts/place_windows_OO_WS3.py", line 21, in
__init__
self.open_and_move()
File "/home/jfb/MyProgs/Scripts/place_windows_OO_WS3.py", line 31, in
open_and_move
p = Popen(['xdotool', 'search', '--classname',
self.classname[self.program]], stdout=subprocess.PIPE)
TypeError: unhashable type: 'list'
Regards, Jim
> The difference is that the shell automatically splits things on
> spaces, so it sees the space between ebook-viewer and the long path,
> and treats the first word as the executable and the second as an
> argument. But Python treats the whole string, spaces and quotes
> included, as the executable.
>
>
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