Albert-Jan Roskam wrote: > Hi, > > In the code below, cmd1 and cmd2 are equivalent, as in: " ".join(cmd1) == > cmd2. But the first example returns a code 2, whereas the second runs > successfully. What is the difference? I prefer using a list as it looks a > little cleaner. Btw, shell=True is needed here. > > > # Python 2.7.3 (default, Jan 2 2013, 13:56:14) [GCC 4.7.2] on linux2 > > import subprocess > > #1# returns retcode 2 (whatever error that maybe) > title, author, version = "title", "author", "1.0.0" > output_dir, input_dir = '/tmp/input', '/tmp/output' > cmd1 = [r'sphinx-apidoc', > r'-f -F', > r'-H', '"%s"' % title,
"title" becomes \"title\", i. e. Python puts in an extra effort to have the quotes survive the subsequent parsing process of the shell: >>> print subprocess.list2cmdline(['"title"']) \"title\" > r'-A', '"%s"' % author, > r'-V', '"%s"' % version, > r'-o', output_dir, input_dir] > retcode = subprocess.call(cmd1, shell=True) > assert not retcode, retcode > > #2# returns retcode 0 (succes) > cmd2 = (r'sphinx-apidoc ' > r'-f -F ' > r'-H "%(title)s" ' > r'-A "%(author)s" ' > r'-V "%(version)s" ' > r'-o %(output_dir)s %(input_dir)s') % locals() > > retcode = subprocess.call(cmd2, shell=True) > assert not retcode, retcode > > # no AssertionError > assert " ".join(cmd1) == cmd2 > > > > Thanks in advance! > > Regards, > > Albert-Jan > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > All right, but apart from the sanitation, the medicine, education, wine, > public order, irrigation, roads, a > > fresh water system, and public health, what have the Romans ever done for > us? > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
